Statistics With Stata Version 12

Copyright 2012 Cengage Learning All Rights Reserved May not be copied, scanned, or duplicated, in whole or in part Due to electronic rights, some third party content may be suppressed from the eBook and/or eChapter(s) Editorial review has deemed that any suppressed content does not materially affect the overall learning experience Cengage Learning reserves the right to remove additional content at any time if subsequent rights restrictions require it StatisticswithSTATA Updated for Version12 Copyright 2012 Cengage Learning All Rights Reserved May not be copied, scanned, or duplicated, in whole or in part Due to electronic rights, some third party content may be suppressed from the eBook and/or eChapter(s) Editorial review has deemed that any suppressed content does not materially affect the overall learning experience Cengage Learning reserves the right to remove additional content at any time if subsequent rights restrictions require it This is an electronic version of the print textbook Due to electronic rights restrictions, some third party content may be suppressed Editorial review has deemed that any suppressed content does not materially affect the overall learning experience The publisher reserves the right to remove content from this title at any time if subsequent rights restrictions require it For valuable information on pricing, previous editions, changes to current editions, and alternate formats, please visit www.cengage.com/highered to search by ISBN#, author, title, or keyword for materials in your areas of interest Copyright 2012 Cengage Learning All Rights Reserved May not be copied, scanned, or duplicated, in whole or in part Due to electronic rights, some third party content may be suppressed from the eBook and/or eChapter(s) Editorial review has deemed that any suppressed content does not materially affect the overall learning experience Cengage Learning reserves the right to remove additional content at any time if subsequent rights restrictions require it StatisticswithSTATA Updated for Version12 Lawrence C Hamilton University of New Hampshire Australia • Brazil • Japan • Korea • Mexico • Singapore • Spain • United Kingdom • United States Copyright 2012 Cengage Learning All Rights Reserved May not be copied, scanned, or duplicated, in whole or in part Due to electronic rights, some third party content may be suppressed from the eBook and/or eChapter(s) Editorial review has deemed that any suppressed content does not materially affect the overall learning experience Cengage Learning reserves the right to remove additional content at any time if subsequent rights restrictions require it Statisticswith STATA: Updated for Version12 © Eighth Edition ALL RIGHTS RESERVED No part of this work covered by the copyright herein may be reproduced, transmitted, stored, or used in any form or by any means graphic, electronic, or mechanical, including but not limited to photocopying, recording, scanning, digitizing, taping, Web distribution, information networks, or information storage and retrieval systems, except as permitted under Section 107 or 108 of the 1976 United States Copyright Act, without the prior written permission of the publisher Lawrence C Hamilton Publisher/Executive Editor: Richard Stratton Senior Sponsoring Editor: Molly Taylor Assistant Editor: Shaylin Walsh Hogan Editorial Assistant/Associate: Alexander Gontar Media Editor: Andrew Coppola Marketing Assistant: Lauren Beck Marketing Communications Manager: Jason LaChappelle , 2009, 2006 Brooks/Cole, Cengage Learning For product information and technology assistance, contact us at Cengage Learning Customer & Sales Support, 1-800-354-9706 For permission to use material from this text or product, submit all requests online at www.cengage.com/permissions Further permissions questions can be emailed to permissionrequest@cengage.com Library of Congress Control Number: 2012945319 ISBN-13: 978-0-8400-6463-9 ISBN-10: 0-8400-6463-2 Brooks/ k Cole 20 Channel Center Street Boston, MA 02210 USA Cengage Learning is a leading provider of customized learning solutions with offi ffice locations around the globe, including Singapore, the United Kingdom, Australia, Mexico, Brazil and Japan Locate your local office ffi at international.cengage.com/region Cengage Learning products are represented in Canada by Nelson Education, Ltd For your course and learning solutions, visit www.cengage.com Purchase any of our products at your local college store or at our preferred online store www.cengagebrain.com Instructors: Please visit login.cengage.com and log in to access instructor-specific fi resources Printed in the United States of America 16 15 14 13 12 Copyright 2012 Cengage Learning All Rights Reserved May not be copied, scanned, or duplicated, in whole or in part Due to electronic rights, some third party content may be suppressed from the eBook and/or eChapter(s) Editorial review has deemed that any suppressed content does not materially affect the overall learning experience Cengage Learning reserves the right to remove additional content at any time if subsequent rights restrictions require it Contents Preface ix Notes on the Eighth Edition x Acknowledgments xi Stata and Stata Resources A Typographical Note An Example Stata Session Stata’s Documentation and Help Files Searching for Information StataCorp The Stata Journal 10 Books Using Stata 11 Data Management Example Commands Creating a New Dataset by Typing in Data Creating a New Dataset by Copy and Paste Specifying Subsets of the Data: in and if Qualifiers Generating and Replacing Variables Missing Value Codes Using Functions Converting Between Numeric and String Formats Creating New Categorical and Ordinal Variables Using Explicit Subscripts with Variables Importing Data from Other Programs Combining Two or More Stata Files Collapsing Data Reshaping Data Using Weights Creating Random Data and Random Samples Writing Programs for Data Management 13 14 16 21 23 26 29 32 36 39 41 42 46 49 52 55 57 61 Graphs Example Commands Histograms Box Plots Scatterplots and Overlays Line Plots and Connected-Line Plots Other Twoway Plot Types 65 65 68 71 74 80 85 v Copyright 2012 Cengage Learning All Rights Reserved May not be copied, scanned, or duplicated, in whole or in part Due to electronic rights, some third party content may be suppressed from the eBook and/or eChapter(s) Editorial review has deemed that any suppressed content does not materially affect the overall learning experience Cengage Learning reserves the right to remove additional content at any time if subsequent rights restrictions require it vi StatisticswithStata Bar Charts and Pie Charts 87 Symmetry and Quantile Plots 90 Adding Text to Graphs 93 Graphing with Do-Files 95 Retrieving and Combining Graphs 96 Graph Editor 97 Creative Graphing 100 Survey Data 107 Example Commands 108 Declare Survey Data 108 Design Weights 110 Poststratification Weights 113 Survey-Weighted Tables and Graphs 115 Bar Charts for Multiple Comparisons 119 Summary Statistics and Tables 123 Example Commands 123 Summary Statistics for Measurement Variables 125 Exploratory Data Analysis 127 Normality Tests and Transformations 129 Frequency Tables and Two-Way Cross-Tabulations 133 Multiple Tables and Multi-Way Cross-Tabulations 136 Tables of Means, Medians and Other Summary Statistics 139 Using Frequency Weights 140 ANOVA and Other Comparison Methods 143 Example Commands 144 One-Sample Tests 145 Two-Sample Tests 148 One-Way Analysis of Variance (ANOVA) 151 Two- and N-Way Analysis of Variance 154 Factor Variables and Analysis of Covariance (ANCOVA) 155 Predicted Values and Error-Bar Charts 158 Linear Regression Analysis 163 Example Commands 163 Simple Regression 167 Correlation 170 Multiple Regression 174 Hypothesis Tests 179 Dummy Variables 181 Interaction Effects 185 Robust Estimates of Variance 190 Predicted Values and Residuals 192 Other Case Statistics 197 Diagnosing Multicollinearity and Heteroskedasticity 202 Copyright 2012 Cengage Learning All Rights Reserved May not be copied, scanned, or duplicated, in whole or in part Due to electronic rights, some third party content may be suppressed from the eBook and/or eChapter(s) Editorial review has deemed that any suppressed content does not materially affect the overall learning experience Cengage Learning reserves the right to remove additional content at any time if subsequent rights restrictions require it Contents vii Confidence Bands in Simple Regression 205 Diagnostic Graphs 209 Advanced Regression Methods 215 Example Commands 215 Lowess Smoothing 217 Robust Regression 221 Further rreg and qreg Applications 227 Nonlinear Regression — 230 Nonlinear Regression — 233 Box–Cox Regression 238 Multiple Imputation of Missing Values 241 Structural Equation Modeling 244 Logistic Regression 251 Example Commands 252 Space Shuttle Data 254 Using Logistic Regression 258 Marginal or Conditional Effects Plots 262 Diagnostic Statistics and Plots 264 Logistic Regression with Ordered-Category y 268 Multinomial Logistic Regression 270 Multiple Imputation of Missing Values — Logit Regression Example 278 10 Survival and Event-Count Models 283 Example Commands 284 Survival-Time Data 286 Count-Time Data 288 Kaplan–Meier Survivor Functions 290 Cox Proportional Hazard Models 293 Exponential and Weibull Regression 299 Poisson Regression 303 Generalized Linear Models 307 11 Principal Component, Factor and Cluster Analysis 313 Example Commands 314 Principal Component Analysis and Principal Component Factoring 315 Rotation 318 Factor Scores 321 Principal Factoring 323 Maximum-Likelihood Factoring 325 Cluster Analysis — 327 Cluster Analysis — 331 Using Factor Scores in Regression 336 Measurement and Structural Equation Models 344 Copyright 2012 Cengage Learning All Rights Reserved May not be copied, scanned, or duplicated, in whole or in part Due to electronic rights, some third party content may be suppressed from the eBook and/or eChapter(s) Editorial review has deemed that any suppressed content does not materially affect the overall learning experience Cengage Learning reserves the right to remove additional content at any time if subsequent rights restrictions require it viii StatisticswithStata12 Time Series Analysis 351 Example Commands 351 Smoothing 353 Further Time Plot Examples 359 Recent Climate Change 363 Lags, Lead and Differences 366 Correlograms 371 ARIMA Models 374 ARMAX Models 382 13 Multilevel and Mixed-Effects Modeling 387 Example Commands 388 Regression with Random Intercepts 390 Random Intercepts and Slopes 395 Multiple Random Slopes 400 Nested Levels 404 Repeated Measurements 406 Cross-Sectional Time Series 410 Mixed-Effects Logit Regression 415 14 Introduction to Programming 423 Basic Concepts and Tools 423 Do-files 423 Ado-files 424 Programs 425 Local macros 426 Global macros 427 Scalars 427 Version 427 Comments 428 Looping 429 If else 430 Arguments 431 Syntax 432 Example Program: multicat (Plot Many Categorical Variables) 434 Using multicat 437 Help File 441 Monte Carlo Simulation 445 Matrix Programming with Mata 452 Dataset Sources 457 References 461 Index 469 Copyright 2012 Cengage Learning All Rights Reserved May not be copied, scanned, or duplicated, in whole or in part Due to electronic rights, some third party content may be suppressed from the eBook and/or eChapter(s) Editorial review has deemed that any suppressed content does not materially affect the overall learning experience Cengage Learning reserves the right to remove additional content at any time if subsequent rights restrictions require it Introduction to Programming 451 The calculations above use the r(Var) variance result from summarize We first obtain the variance of the OLS estimates b1, and make this value scalar Varb1 Next the variances of the robust estimates b1r, and the quantile estimates b1q, are obtained and each is compared with Varb1 This reveals that robust regression was about 94% as efficient as OLS when applied to the normal-errors model — close to the large-sample efficiency of 95% that this robust method theoretically should have (Hamilton 1992a) Quantile regression, in contrast, achieves a relative efficiency of only 70% with the normal-errors model Similar calculations for the contaminated-errors model tell a different story OLS was the best (most efficient) estimator with normal errors, but with contaminated errors it becomes the worst: quietly summarize b2 scalar Varb2 = r(Var) quietly summarize b2r display 100*(Varb2/r(Var)) 533.47627 quietly summarize b2q display 100*(Varb2/r(Var)) 392.58875 Outliers in the contaminated-errors model cause OLS coefficient estimates to vary wildly from sample to sample, as can be seen in the fourth box plot of Figure 14.7 The variance of these OLS coefficients is more than five times greater than the variance of the corresponding robust coefficients, and almost four times greater than that of quantile coefficients Put another way, both robust and quantile regression prove to be much more stable than OLS in the presence of outliers, yielding correspondingly lower standard errors and narrower confidence intervals Robust regression outperforms quantile regression with both the normal-errors and the contaminated-errors models Figure 14.8 illustrates the comparison between OLS and robust regression with a scatterplot showing 500 pairs of regression coefficients The OLS coefficients (vertical axis) vary much more widely around the true value, 2.0, than rreg coefficients (horizontal axis) graph twoway scatter b2 b2r, msymbol(dh) ylabel(1(.5)3, grid) yline(2) xlabel(1(.5)3, grid gmin gmax) xline(2) ytitle('OLS regression coef, contaminated errors') xtitle('Robust regression coef, contaminated errors') Copyright 2012 Cengage Learning All Rights Reserved May not be copied, scanned, or duplicated, in whole or in part Due to electronic rights, some third party content may be suppressed from the eBook and/or eChapter(s) Editorial review has deemed that any suppressed content does not materially affect the overall learning experience Cengage Learning reserves the right to remove additional content at any time if subsequent rights restrictions require it 452 StatisticswithStata Figure 14.5 The Monte Carlo experiment also provides information about the estimated standard errors under each method and model Mean estimated standard errors differ from the observed standard deviations of coefficients Discrepancies for the robust standard errors are relatively small — less than 4% For the theoretically-derived quantile standard errors the discrepancies are larger, around 7% The least satisfactory estimates appear to be the bootstrapped quantile standard errors obtained by bsqreg Means of the bootstrap standard errors exceed the observed standard deviation of b1q and b2q by 10 or 11% Bootstrapping apparently over-estimates the sample-tosample variation Monte Carlo simulation has become a key method in modern statistical research, and it plays a growing role in statistical teaching as well These examples demonstrate some easy ways to get started Matrix Programming with Mata Stata’s matrix programming language called Mata, is described in the two-volume Mata Matrix Programming manual This rich topic lies beyond the introductory scope of StatisticswithStata It seems fitting, however, to conclude the book with a brief look at Mata Its programming tools open new paths for Stata’s development Rather than undertaking the large task of explaining Mata’s concepts and features, we will proceed inductively and jump right to an example: writing a program that performs ordinary least squares (OLS) regression The basic regression model is y = Xb + u Copyright 2012 Cengage Learning All Rights Reserved May not be copied, scanned, or duplicated, in whole or in part Due to electronic rights, some third party content may be suppressed from the eBook and/or eChapter(s) Editorial review has deemed that any suppressed content does not materially affect the overall learning experience Cengage Learning reserves the right to remove additional content at any time if subsequent rights restrictions require it Introduction to Programming 453 where y is an (n×1) column vector of dependent-variable values, X an (n×k) matrix containing values of (usually) k–1 predictor variables and a column of 1’s, and u an (n×1) vector of errors b is a (k×1) vector of regression coefficients, estimated as b = (X'X) –1 X'y This matrix calculation, familiar to generations of statistics students, provides a good entry point for seeing Mata at work Dataset reactor.dta contains information about the decommissioning costs of five nuclear power plants that were shut down over 1968–1982 This example has the pedagogical advantage that its small matrices could be written easily on blackboard or paper, if desired (e.g., Hamilton 1992a:340) In any event, it invites the question of how decommissioning costs might be related to reactor capacity and years of operation use C:datareactor.dta, clear describe Contains data from C:datareactor.dta obs: vars: size: Reactor decommissioning costs (from Brown et al 1986) 20 Jun 2012 13:23 110 variable name site decom capacity years start close Sorted by: storage type str14 byte int byte int int display format value label variable label %14s %8.0g %8.0g %9.0g %8.0g %8.0g Reactor site Decommissioning cost, millions Generating capacity, megawatts Years in operation Year operations started Year operations closed start Performing OLS regression withStata is very easy, of course We find that decommissioning costs among these five reactors increased by about 176 million dollars ($175,874) with each megawatt of generating capacity, and by about 3.9 million dollars with each year of operation The two predictors explain almost 99% of the variance in decommissioning costs (R2a = 9895) regress decom capacity years Source SS df MS Model Residual 4666.16571 24.6342883 2 2333.08286 12.3171442 Total 4690.8 1172.7 decom Coef capacity years _cons 1758739 3.899314 -11.39963 Std Err .0247774 2643087 4.330311 t 7.10 14.75 -2.63 Number of obs F( 2, 2) Prob > F R-squared Adj R-squared Root MSE P>|t| 0.019 0.005 0.119 = = = = = = 189.42 0.0053 0.9947 0.9895 3.5096 [95% Conf Interval] 0692653 2.762085 -30.03146 2824825 5.036543 7.23219 Copyright 2012 Cengage Learning All Rights Reserved May not be copied, scanned, or duplicated, in whole or in part Due to electronic rights, some third party content may be suppressed from the eBook and/or eChapter(s) Editorial review has deemed that any suppressed content does not materially affect the overall learning experience Cengage Learning reserves the right to remove additional content at any time if subsequent rights restrictions require it 454 StatisticswithStata The ado-file below defines program ols0 using Mata commands It simply calculates the vector of regression coefficients b Mata commands start with mata: in this example (Several other ways to use these commands interactively or in programs are described in the manuals.) The first two mata: commands define vector y and matrix X as “views” of the data in memory, specified by whatever left-hand-side (lhs) and right-hand-side (rhs) variables appeared in the ols0 command line A constant, 1, forms the last column of matrix X ols0 permits in or if qualifiers, or missing values The estimating equation b = (X'X) –1 X'y is written in Mata as mata: b = invsym(X'X)*X'y The fourth mata: command displays the resulting contents of b *! 21jun2012 *! L Hamilton, StatisticswithStata (2012) program ols0 version 12.1 syntax varlist(min=1 numeric) [in] [if] marksample touse gen cons_ = tokenize `varlist' local lhs '`1' mac shift local rhs '`*' mata: st_view(y=., , '`lhs', '`touse') mata: st_view(X=., , (tokens('`rhs'), 'cons_'), '`touse') mata: b = invsym(X'X)*X'y mata: b drop cons_ end Applied to the reactor decommissioning data, ols0 obtains regression coefficients identical to those found earlier by regress ols0 decom capacity years 1 1758738974 3.899313867 -11.39963279 Using Mata versions of the standard equations, program ols1 (next page) adds the calculation of standard errors, t statistics, and t test probabilities Again, the calculations lead to the same results we saw earlier with regress Commas in the final mata statement of ols1 are operators, meaning “join the columns of the following matrices.” *! 21jun2012 *! L Hamilton, StatisticswithStata (2012) program ols1 version 12.1 Copyright 2012 Cengage Learning All Rights Reserved May not be copied, scanned, or duplicated, in whole or in part Due to electronic rights, some third party content may be suppressed from the eBook and/or eChapter(s) Editorial review has deemed that any suppressed content does not materially affect the overall learning experience Cengage Learning reserves the right to remove additional content at any time if subsequent rights restrictions require it Introduction to Programming 455 syntax varlist(min=1 numeric) [in] [if] marksample touse gen cons_ = tokenize `varlist' local lhs '`1' mac shift local rhs '`*' mata: st_view(y=., , '`lhs', '`touse') mata: st_view(X=., , (tokens('`rhs'), 'cons_'), '`touse') mata: b = invsym(X'X)*X'y mata: e = y - X*b mata: n = rows(X) mata: k = cols(X) mata: s2 = (e'e)/(n-k) mata: V = s2*invsym(X'X) mata: se = sqrt(diagonal(V)) mata: (b, se, b:/se, 2*ttail(n-k, abs(b:/se))) drop cons_ end ols1 decom capacity years 3 1758738974 3.899313867 -11.39963279 0247774037 26430873 4.330310729 7.098156835 14.75287581 -2.632520735 0192756353 0045631637 1190686843 We could expand this program to store results, and post them in a nicely-formatted output table similar to that of regress Program ols2 (next page) accomplishes something different, in order to demonstrate how Mata joins matrices together It combines the numerical results seen above into a string matrix that also contains column headings and a list of independent-variable names This happens through several additional mata commands One defines row vector vnames_ containing a list of variable names The commas in this expression join three sets of columns: (1) the word “Yvar:” followed by the left-hand-side variable’s name; (2) the names of all righthand-side variables; and (3) the word “_cons” mata: vnames_ = 'Yvar: `lhs', tokens('`rhs'), '_cons' The next long mata command uses within-line comment delimiters, /* and */, so that Mata reads past the end of two physical lines and sees this as all one command: mata: vnames_', ('Coef.' strofreal(b)), /* */ ('Std Err.' strofreal(se)), /* */ ('t' strofreal(t)), ('P>|t|' strofreal(Prt)) The command displays a matrix in which the first column is the transpose of vnames_ (that is, a column of variable names) The column of variable names is joined, using a comma, to a second column vector created with the word “Coefs” as its first row; remaining rows are filled by the coefficients in b converted from real numbers to strings The backslash operator “” joins rows to a matrix, just as “,” joins columns The real-to-string conversion of b values is necessary to make the matrix types compatible Similar operations in ols2 form labeled columns of standard errors, t statistics, and probabilities Copyright 2012 Cengage Learning All Rights Reserved May not be copied, scanned, or duplicated, in whole or in part Due to electronic rights, some third party content may be suppressed from the eBook and/or eChapter(s) Editorial review has deemed that any suppressed content does not materially affect the overall learning experience Cengage Learning reserves the right to remove additional content at any time if subsequent rights restrictions require it 456 StatisticswithStata *! 21jun2012 *! L Hamilton, StatisticswithStata (2012) program ols2 version 12.1 syntax varlist(min=1 numeric) [in] [if] marksample touse gen cons_ = tokenize `varlist' local lhs '`1' mac shift local rhs '`*' mata: st_view(y=., , '`lhs', '`touse') mata: st_view(X=., , (tokens('`rhs'), 'cons_'), '`touse') mata: b = invsym(X'X)*X'y mata: e = y - X*b mata: n = rows(X) mata: k = cols(X) mata: s2 = (e'e)/(n-k) mata: V = s2*invsym(X'X) mata: se = sqrt(diagonal(V)) mata: t = b:/se mata: Prt = 2*ttail(n-k, abs(b:/se)) mata: vnames_ = 'Yvar: `lhs', tokens('`rhs'), '_cons' mata: vnames_', ('Coef.' strofreal(b)), /* */ ('Std Err.' strofreal(se)), /* */ ('t' strofreal(t)), ('P>|t|' strofreal(Prt)) drop cons_ end ols2 decom capacity years 4 Yvar: decom capacity years _cons Coef .1758739 3.899314 -11.39963 Std Err .0247774 2643087 4.330311 t 7.098157 14.75288 -2.632521 P>|t| 0192756 0045632 1190687 These Mata exercises, like other examples in this chapter, give only a glimpse of Stata programming The Stata Journal publishes more inspired applications, and each update of Stata involves new or improved ado-files Online NetCourses provide a guided route to fluency in writing your own programs Copyright 2012 Cengage Learning All Rights Reserved May not be copied, scanned, or duplicated, in whole or in part Due to electronic rights, some third party content may be suppressed from the eBook and/or eChapter(s) Editorial review has deemed that any suppressed content does not materially affect the overall learning experience Cengage Learning reserves the right to remove additional content at any time if subsequent rights restrictions require it Dataset Sources The following publications or Web pages provide background information such as definitions, original sources and broader context of data used as examples in StatisticswithStata (2012) Often the example datasets are excerpts from larger files, or contain variables that have been merged from more than one source See References for full bibliographic citations aids.raw aids.dta Selvin (1995) Alaska_places.dta Hamilton et al (2011) Alaska_regions.dta Hamilton and Lammers (2011) Antarctic2.dta Milke and Heygster (2009) Arctic9.dta Sea ice extent: NSIDC (National Snow and Ice Data Center), Sea Ice Index http://nsidc.org/data/seaice_index/ Sea ice volume: PIOMAS (Pan-Arctic Ice Ocean Modeling and Assimilation System), Polar Science Center, University of Washington Arctic Sea Ice Volume Anomaly http://psc.apl.washington.edu/wordpress/research/projects/arctic-sea-ice-volume-ano maly/ Annual air temperature anomaly 64–90 °N: GISTEMP (GISS Surface Temperature Analysis), Goddard Institute for Space Studies, NASA http://data.giss.nasa.gov/gistemp/ attract2.dta Hamilton (2003) Canada1.dta Canada2.dta Federal, Provincial and Territorial Advisory Committee on Population Health (1996) 457 Copyright 2012 Cengage Learning All Rights Reserved May not be copied, scanned, or duplicated, in whole or in part Due to electronic rights, some third party content may be suppressed from the eBook and/or eChapter(s) Editorial review has deemed that any suppressed content does not materially affect the overall learning experience Cengage Learning reserves the right to remove additional content at any time if subsequent rights restrictions require it 458 StatisticswithStata Climate.dta NCDC global temperature: National Climatic Data Center, NOAA Global Surface Temperature Anomalies http://www.ncdc.noaa.gov/cmb-faq/anomalies.php NASA global temperature: GISTEMP (GISS Surface Temperature Analysis), Goddard Institute for Space Studies, NASA http://data.giss.nasa.gov/gistemp/ UAH global temperature: University of Alabama, Huntsville http://vortex.nsstc.uah.edu/data/msu/t2lt/uahncdc.lt Aerosol Optical Depth (AOD): Sato et al (1993) Goddard Institute for Space Studies, NASA Forcings in GISS Climate Model http://data.giss.nasa.gov/modelforce/strataer/ Total Solar Irradiance (TSI): Fröhlich (2006) Physikalisch-Meteorologischen Observatoriums Davos, World Radiation Center (PMOD WRC) Solar Constant http://www.pmodwrc.ch/pmod.php?topic=tsi/composite/SolarConstant Multivariate ENSO Index (MEI): Wolter and Timlin (1998) Earth Systems Research Laboratory, Physical Sciences Division, NOAA Multivariate ENSO Index http://www.esrl.noaa.gov/psd/enso/mei/mei.html Global average marine surface CO2: Masarie and Tans (1995) Earth System Research Laboratory, Global Monitoring Division, NOAA Trends in Atmospheric Carbon Dioxide http://www.esrl.noaa.gov/gmd/ccgg/trends/global.html#global_data election_2004i.dta Robinson (2005) Geovisualization of the 2004 Presidential Election http://www.personal.psu.edu/users/a/c/acr181/election.html electricity.dta California Energy Commission (2012) U.S Per Capita Electricity Use by State, 2010 http://energyalmanac.ca.gov/electricity/us_per_capita_electricity-2010.html global1.dta global2.dta global3.dta global_yearly.dta Multivariate ENSO Index (MEI): see climate.dta NCDC global temperature: see climate.dta Granite2011_6.dta Hamilton (2012) Also see “Do you believe the climate is changing?” by Hamilton (2011) at http://www.carseyinstitute.unh.edu/publications/IB-Hamilton-Climate-ChangeNational-NH.pdf Greenland_sulfate.dta Mayewski, Holdsworth et al (1993); Mayewski, Meeker et al (1993) Also see Sulfate and Nitrate Concentrations at GISP2 from 1750–1990 http://www.gisp2.sr.unh.edu/DATA/SO4NO3.html Copyright 2012 Cengage Learning All Rights Reserved May not be copied, scanned, or duplicated, in whole or in part Due to electronic rights, some third party content may be suppressed from the eBook and/or eChapter(s) Editorial review has deemed that any suppressed content does not materially affect the overall learning experience Cengage Learning reserves the right to remove additional content at any time if subsequent rights restrictions require it Dataset Sources 459 Greenland_temperature.dta GISP2 ice core temperature: Alley (2004) NOAA Paleoclimatology Program and World Data Center for Paleoclimatology, Boulder ftp://ftp.ncdc.noaa.gov/pub/data/paleo/icecore/greenland/summit/gisp2/isotopes/gisp2_temp _accum_alley2000.txt Summit temperature 1987–1999: Shuman et al (2001) greenpop1.dta Hamilton and Rasumssen (2010) GSS_2010_SwS.dta Davis et al (2005) National Opinion Research Center (NORC), University of Chicago General Social Survey http://www3.norc.org/GSS+Website/ heart.dta Selvin (1995) lakewin1.dta lakewin2.dta lakewin3.dta lakesun.dta lakesunwin.dta Lake Winnipesaukee ice out: http://www.winnipesaukee.com/index.php?pageid=iceout Lake Sunapee ice out: http://www.town.sunapee.nh.us/Pages/SunapeeNH_Clerk/ Also see Hamilton et al (2010a) at http://www.carseyinstitute.unh.edu/publications/IB_Hamilton_Climate_Survey_NH.pdf MEI0.dta MEI1.dta Multivariate ENSO Index: see climate.dta MILwater.dta Hamilton (1985) Nations2.dta Nations3.dta Human Development Reports, United Nations Development Program International Human Development Indicators http://hdrstats.undp.org/en/tables/ oakridge.dta Selvin (1995) planets.dta Beatty (1981) Copyright 2012 Cengage Learning All Rights Reserved May not be copied, scanned, or duplicated, in whole or in part Due to electronic rights, some third party content may be suppressed from the eBook and/or eChapter(s) Editorial review has deemed that any suppressed content does not materially affect the overall learning experience Cengage Learning reserves the right to remove additional content at any time if subsequent rights restrictions require it 460 StatisticswithStata PNWsurvey2_11.dta Hamilton et al (2010b, 2012) Also see “Ocean views” by Safford and Hamilton (2010), at http://www.carseyinstitute.unh.edu/publications/PB_Safford_DowneastMaine.pdf reactor.dta Brown et al (1986) shuttle.dta shuttle0.dta Report of the Presidential Commission on the Space Shuttle Challenger Accident (1986) Tufte (1997) smoking1.dta smoking1.dta Rosner (1995) snowfall.xls Hamilton et al (2003) southmig1.dta southmig2.dta Voss et al (2005) student2.dta Ward and Ault (1990) whitemt1.dta whitemt2.dta Hamilton et al (2007) writing.dta Nash and Schwartz (1987) Copyright 2012 Cengage Learning All Rights Reserved May not be copied, scanned, or duplicated, in whole or in part Due to electronic rights, some third party content may be suppressed from the eBook and/or eChapter(s) Editorial review has deemed that any suppressed content does not materially affect the overall learning experience Cengage Learning reserves the right to remove additional content at any time if subsequent rights restrictions require it References Albright, J.J and D.M Marinova 2010 “Estimating Multilevel Models Using SPSS, Stata, and SAS.” Indiana University Alley, R.B 2004 GISP2 Ice Core Temperature and Accumulation Data IGBP PAGES/World Data Center for Paleoclimatology Data Contribution Series #2004-013 NOAA/NGDC Paleoclimatology Program, Boulder CO, USA Beatty, J.K., B O’Leary and A Chaikin (eds.) 1981 The New Solar 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Learning All Rights Reserved May not be copied, scanned, or duplicated, in whole or in part Due to electronic rights, some third party content may be suppressed from the eBook and/or eChapter(s) Editorial review has deemed that any suppressed content does not materially affect the overall learning experience Cengage Learning reserves the right to remove additional content at any time if subsequent rights restrictions require it ... first external Stata book, Statistics with Stata, published in 1989 for Stata version Stata s 20th anniversary in 2005 was marked by a special issue of the Stata Journal, filled with historical... it 10 Statistics with Stata Training — Enroll in web-based NetCourses on selected topics such as Introduction to Stata, Introduction to Stata Programming, or Advanced Stata Programming Stata. .. of Stata s 20th anniversary (5(1), 2005) contains articles about the early development of Stata, and one about the first Stata book: “A short history of Statistics with Stata. ” Books Using Stata