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An Introduction to Categorical Data Analysis
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Table of Contents

Preface to the Second Edition xv 1. Introduction 1 1.1 Categorical Response Data, 1 1.1.1 Response/Explanatory Variable Distinction, 2 1.1.2 Nominal/Ordinal Scale Distinction, 2 1.1.3 Organization of this Book, 3 1.2 Probability Distributions for Categorical Data, 3 1.2.1 Binomial Distribution, 4 1.2.2 Multinomial Distribution, 5 1.3 Statistical Inference for a Proportion, 6 1.3.1 Likelihood Function and Maximum Likelihood Estimation, 6 1.3.2 Significance Test About a Binomial Proportion, 8 1.3.3 Example: Survey Results on Legalizing Abortion, 8 1.3.4 Confidence Intervals for a Binomial Proportion, 9 1.4 More on Statistical Inference for Discrete Data, 11 1.4.1 Wald, Likelihood-Ratio, and Score Inference, 11 1.4.2 Wald, Score, and Likelihood-Ratio Inference for Binomial Parameter, 12 1.4.3 Small-Sample Binomial Inference, 13 1.4.4 Small-Sample Discrete Inference is Conservative, 14 1.4.5 Inference Based on the Mid P-value, 15 1.4.6 Summary, 16 Problems, 16 2. Contingency Tables 21 2.1 Probability Structure for Contingency Tables, 21 2.1.1 Joint, Marginal, and Conditional Probabilities, 22 2.1.2 Example: Belief in Afterlife, 22 2.1.3 Sensitivity and Specificity in Diagnostic Tests, 23 2.1.4 Independence, 24 2.1.5 Binomial and Multinomial Sampling, 25 2.2 Comparing Proportions in Two-by-Two Tables, 25 2.2.1 Difference of Proportions, 26 2.2.2 Example: Aspirin and Heart Attacks, 26 2.2.3 Relative Risk, 27 2.3 The Odds Ratio, 28 2.3.1 Properties of the Odds Ratio, 29 2.3.2 Example: Odds Ratio for Aspirin Use and Heart Attacks, 30 2.3.3 Inference for Odds Ratios and Log Odds Ratios, 30 2.3.4 Relationship Between Odds Ratio and Relative Risk, 32 2.3.5 The Odds Ratio Applies in Case-Control Studies, 32 2.3.6 Types of Observational Studies, 34 2.4 Chi-Squared Tests of Independence, 34 2.4.1 Pearson Statistic and the Chi-Squared Distribution, 35 2.4.2 Likelihood-Ratio Statistic, 36 2.4.3 Tests of Independence, 36 2.4.4 Example: Gender Gap in Political Affiliation, 37 2.4.5 Residuals for Cells in a Contingency Table, 38 2.4.6 Partitioning Chi-Squared, 39 2.4.7 Comments About Chi-Squared Tests, 40 2.5 Testing Independence for Ordinal Data, 41 2.5.1 Linear Trend Alternative to Independence, 41 2.5.2 Example: Alcohol Use and Infant Malformation, 42 2.5.3 Extra Power with Ordinal Tests, 43 2.5.4 Choice of Scores, 43 2.5.5 Trend Tests for I x 2 and 2 x J Tables, 44 2.5.6 Nominal-Ordinal Tables, 45 2.6 Exact Inference for Small Samples, 45 2.6.1 Fisher's Exact Test for 2 x 2 Tables, 45 2.6.2 Example: Fisher's Tea Taster, 46 2.6.3 P-values and Conservatism for Actual P(Type I Error), 47 2.6.4 Small-Sample Confidence Interval for Odds Ratio, 48 2.7 Association in Three-Way Tables, 49 2.7.1 Partial Tables, 49 2.7.2 Conditional Versus Marginal Associations: Death Penalty Example, 49 2.7.3 Simpson's Paradox, 51 2.7.4 Conditional and Marginal Odds Ratios, 52 2.7.5 Conditional Independence Versus Marginal Independence, 53 2.7.6 Homogeneous Association, 54 Problems, 55 3. Generalized Linear Models 65 3.1 Components of a Generalized Linear Model, 66 3.1.1 Random Component, 66 3.1.2 Systematic Component, 66 3.1.3 Link Function, 66 3.1.4 Normal GLM, 67 3.2 Generalized Linear Models for Binary Data, 68 3.2.1 Linear Probability Model, 68 3.2.2 Example: Snoring and Heart Disease, 69 3.2.3 Logistic Regression Model, 70 3.2.4 Probit Regression Model, 72 3.2.5 Binary Regression and Cumulative Distribution Functions, 72 3.3 Generalized Linear Models for Count Data, 74 3.3.1 Poisson Regression, 75 3.3.2 Example: Female Horseshoe Crabs and their Satellites, 75 3.3.3 Overdispersion: Greater Variability than Expected, 80 3.3.4 Negative Binomial Regression, 81 3.3.5 Count Regression for Rate Data, 82 3.3.6 Example: British Train Accidents over Time, 83 3.4 Statistical Inference and Model Checking, 84 3.4.1 Inference about Model Parameters, 84 3.4.2 Example: Snoring and Heart Disease Revisited, 85 3.4.3 The Deviance, 85 3.4.4 Model Comparison Using the Deviance, 86 3.4.5 Residuals Comparing Observations to the Model Fit, 87 3.5 Fitting Generalized Linear Models, 88 3.5.1 The Newton-Raphson Algorithm Fits GLMs, 88 3.5.2 Wald, Likelihood-Ratio, and Score Inference Use the Likelihood Function, 89 3.5.3 Advantages of GLMs, 90 Problems, 90 4. Logistic Regression 99 4.1 Interpreting the Logistic Regression Model, 99 4.1.1 Linear Approximation Interpretations, 100 4.1.2 Horseshoe Crabs: Viewing and Smoothing a Binary Outcome, 101 4.1.3 Horseshoe Crabs: Interpreting the Logistic Regression Fit, 101 4.1.4 Odds Ratio Interpretation, 104 4.1.5 Logistic Regression with Retrospective Studies, 105 4.1.6 Normally Distributed X Implies Logistic Regression for Y , 105 4.2 Inference for Logistic Regression, 106 4.2.1 Binary Data can be Grouped or Ungrouped, 106 4.2.2 Confidence Intervals for Effects, 106 4.2.3 Significance Testing, 107 4.2.4 Confidence Intervals for Probabilities, 108 4.2.5 Why Use a Model to Estimate Probabilities?, 108 4.2.6 Confidence Intervals for Probabilities: Details, 108 4.2.7 Standard Errors of Model Parameter Estimates, 109 4.3 Logistic Regression with Categorical Predictors, 110 4.3.1 Indicator Variables Represent Categories of Predictors, 110 4.3.2 Example: AZT Use and AIDS, 111 4.3.3 ANOVA-Type Model Representation of Factors, 113 4.3.4 The Cochran-Mantel-Haenszel Test for 2 x 2 x K Contingency Tables, 114 4.3.5 Testing the Homogeneity of Odds Ratios, 115 4.4 Multiple Logistic Regression, 115 4.4.1 Example: Horseshoe Crabs with Color andWidth Predictors, 116 4.4.2 Model Comparison to Check Whether a Term is Needed, 118 4.4.3 Quantitative Treatment of Ordinal Predictor, 118 4.4.4 Allowing Interaction, 119 4.5 Summarizing Effects in Logistic Regression, 120 4.5.1 Probability-Based Interpretations, 120 4.5.2 Standardized Interpretations, 121 Problems, 121 5. Building and Applying Logistic Regression Models 137 5.1 Strategies in Model Selection, 137 5.1.1 How Many Predictors CanYou Use?, 138 5.1.2 Example: Horseshoe Crabs Revisited, 138 5.1.3 Stepwise Variable Selection Algorithms, 139 5.1.4 Example: Backward Elimination for Horseshoe Crabs, 140 5.1.5 AIC, Model Selection, and the "Correct" Model, 141 5.1.6 Summarizing Predictive Power: Classification Tables, 142 5.1.7 Summarizing Predictive Power: ROC Curves, 143 5.1.8 Summarizing Predictive Power: A Correlation, 144 5.2 Model Checking, 144 5.2.1 Likelihood-Ratio Model Comparison Tests, 144 5.2.2 Goodness of Fit and the Deviance, 145 5.2.3 Checking Fit: Grouped Data, Ungrouped Data, and Continuous Predictors, 146 5.2.4 Residuals for Logit Models, 147 5.2.5 Example: Graduate Admissions at University of Florida, 149 5.2.6 Influence Diagnostics for Logistic Regression, 150 5.2.7 Example: Heart Disease and Blood Pressure, 151 5.3 Effects of Sparse Data, 152 5.3.1 Infinite Effect Estimate: Quantitative Predictor, 152 5.3.2 Infinite Effect Estimate: Categorical Predictors, 153 5.3.3 Example: Clinical Trial with Sparse Data, 154 5.3.4 Effect of Small Samples on X2 and G2 Tests, 156 5.4 Conditional Logistic Regression and Exact Inference, 157 5.4.1 Conditional Maximum Likelihood Inference, 157 5.4.2 Small-Sample Tests for Contingency Tables, 158 5.4.3 Example: Promotion Discrimination, 159 5.4.4 Small-Sample Confidence Intervals for Logistic Parameters and Odds Ratios, 159 5.4.5 Limitations of Small-Sample Exact Methods, 160 5.5 Sample Size and Power for Logistic Regression, 160 5.5.1 Sample Size for Comparing Two Proportions, 161 5.5.2 Sample Size in Logistic Regression, 161 5.5.3 Sample Size in Multiple Logistic Regression, 162 Problems, 163 6. Multicategory Logit Models 173 6.1 Logit Models for Nominal Responses, 173 6.1.1 Baseline-Category Logits, 173 6.1.2 Example: Alligator Food Choice, 174 6.1.3 Estimating Response Probabilities, 176 6.1.4 Example: Belief in Afterlife, 178 6.1.5 Discrete Choice Models, 179 6.2 Cumulative Logit Models for Ordinal Responses, 180 6.2.1 Cumulative Logit Models with Proportional Odds Property, 180 6.2.2 Example: Political Ideology and Party Affiliation, 182 6.2.3 Inference about Model Parameters, 184 6.2.4 Checking Model Fit, 184 6.2.5 Example: Modeling Mental Health, 185 6.2.6 Interpretations Comparing Cumulative Probabilities, 187 6.2.7 Latent Variable Motivation, 187 6.2.8 Invariance to Choice of Response Categories, 189 6.3 Paired-Category Ordinal Logits, 189 6.3.1 Adjacent-Categories Logits, 190 6.3.2 Example: Political Ideology Revisited, 190 6.3.3 Continuation-Ratio Logits, 191 6.3.4 Example: A Developmental Toxicity Study, 191 6.3.5 Overdispersion in Clustered Data, 192 6.4 Tests of Conditional Independence, 193 6.4.1 Example: Job Satisfaction and Income, 193 6.4.2 Generalized Cochran-Mantel-Haenszel Tests, 194 6.4.3 Detecting Nominal-Ordinal Conditional Association, 195 6.4.4 Detecting Nominal-Nominal Conditional Association, 196 Problems, 196 7. Loglinear Models for Contingency Tables 204 7.1 Loglinear Models for Two-Way and Three-Way Tables, 204 7.1.1 Loglinear Model of Independence for Two-Way Table, 205 7.1.2 Interpretation of Parameters in Independence Model, 205 7.1.3 Saturated Model for Two-Way Tables, 206 7.1.4 Loglinear Models for Three-Way Tables, 208 7.1.5 Two-Factor Parameters Describe Conditional Associations, 209 7.1.6 Example: Alcohol, Cigarette, and Marijuana Use, 209 7.2 Inference for Loglinear Models, 212 7.2.1 Chi-Squared Goodness-of-Fit Tests, 212 7.2.2 Loglinear Cell Residuals, 213 7.2.3 Tests about Conditional Associations, 214 7.2.4 Confidence Intervals for Conditional Odds Ratios, 214 7.2.5 Loglinear Models for Higher Dimensions, 215 7.2.6 Example: Automobile Accidents and Seat Belts, 215 7.2.7 Three-Factor Interaction, 218 7.2.8 Large Samples and Statistical vs Practical Significance, 218 7.3 The Loglinear-Logistic Connection, 219 7.3.1 Using Logistic Models to Interpret Loglinear Models, 219 7.3.2 Example: Auto Accident Data Revisited, 220 7.3.3 Correspondence Between Loglinear and Logistic Models, 221 7.3.4 Strategies in Model Selection, 221 7.4 Independence Graphs and Collapsibility, 223 7.4.1 Independence Graphs, 223 7.4.2 Collapsibility Conditions for Three-Way Tables, 224 7.4.3 Collapsibility and Logistic Models, 225 7.4.4 Collapsibility and Independence Graphs for Multiway Tables, 225 7.4.5 Example: Model Building for Student Drug Use, 226 7.4.6 Graphical Models, 228 7.5 Modeling Ordinal Associations, 228 7.5.1 Linear-by-Linear Association Model, 229 7.5.2 Example: Sex Opinions, 230 7.5.3 Ordinal Tests of Independence, 232 Problems, 232 8. Models for Matched Pairs 244 8.1 Comparing Dependent Proportions, 245 8.1.1 McNemar Test Comparing Marginal Proportions, 245 8.1.2 Estimating Differences of Proportions, 246 8.2 Logistic Regression for Matched Pairs, 247 8.2.1 Marginal Models for Marginal Proportions, 247 8.2.2 Subject-Specific and Population-Averaged Tables, 248 8.2.3 Conditional Logistic Regression for Matched-Pairs, 249 8.2.4 Logistic Regression for Matched Case-Control Studies, 250 8.2.5 Connection between McNemar and Cochran-Mantel-Haenszel Tests, 252 8.3 Comparing Margins of Square Contingency Tables, 252 8.3.1 Marginal Homogeneity and Nominal Classifications, 253 8.3.2 Example: Coffee Brand Market Share, 253 8.3.3 Marginal Homogeneity and Ordered Categories, 254 8.3.4 Example: Recycle or Drive Less to Help Environment?, 255 8.4 Symmetry and Quasi-Symmetry Models for Square Tables, 256 8.4.1 Symmetry as a Logistic Model, 257 8.4.2 Quasi-Symmetry, 257 8.4.3 Example: Coffee Brand Market Share Revisited, 257 8.4.4 Testing Marginal Homogeneity Using Symmetry and Quasi-Symmetry, 258 8.4.5 An Ordinal Quasi-Symmetry Model, 258 8.4.6 Example: Recycle or Drive Less?, 259 8.4.7 Testing Marginal Homogeneity Using Symmetry and Ordinal Quasi-Symmetry, 259 8.5 Analyzing Rater Agreement, 260 8.5.1 Cell Residuals for Independence Model, 261 8.5.2 Quasi-independence Model, 261 8.5.3 Odds Ratios Summarizing Agreement, 262 8.5.4 Quasi-Symmetry and Agreement Modeling, 263 8.5.5 Kappa Measure of Agreement, 264 8.6 Bradley-Terry Model for Paired Preferences, 264 8.6.1 The Bradley-Terry Model, 265 8.6.2 Example: Ranking Men Tennis Players, 265 Problems, 266 9. Modeling Correlated, Clustered Responses 276 9.1 Marginal Models Versus Conditional Models, 277 9.1.1 Marginal Models for a Clustered Binary Response, 277 9.1.2 Example: Longitudinal Study of Treatments for Depression, 277 9.1.3 Conditional Models for a Repeated Response, 279 9.2 Marginal Modeling: The GEE Approach, 279 9.2.1 Quasi-Likelihood Methods, 280 9.2.2 Generalized Estimating Equation Methodology: Basic Ideas, 280 9.2.3 GEE for Binary Data: Depression Study, 281 9.2.4 Example: Teratology Overdispersion, 283 9.2.5 Limitations of GEE Compared with ML, 284 9.3 Extending GEE: Multinomial Responses, 285 9.3.1 Marginal Modeling of a Clustered Multinomial Response, 285 9.3.2 Example: Insomnia Study, 285 9.3.3 AnotherWay of Modeling Association with GEE, 287 9.3.4 Dealing with Missing Data, 287 9.4 Transitional Modeling, Given the Past, 288 9.4.1 Transitional Models with Explanatory Variables, 288 9.4.2 Example: Respiratory Illness and Maternal Smoking, 288 9.4.3 Comparisons that Control for Initial Response, 289 9.4.4 Transitional Models Relate to Loglinear Models, 290 Problems, 290 10. Random Effects: Generalized Linear Mixed Models 297 10.1 Random Effects Modeling of Clustered Categorical Data, 297 10.1.1 The Generalized Linear Mixed Model, 298 10.1.2 A Logistic GLMM for Binary Matched Pairs, 299 10.1.3 Example: Sacrifices for the Environment Revisited, 300 10.1.4 Differing Effects in Conditional Models and Marginal Models, 300 10.2 Examples of Random Effects Models for Binary Data, 302 10.2.1 Small-Area Estimation of Binomial Probabilities, 302 10.2.2 Example: Estimating Basketball Free Throw Success, 303 10.2.3 Example: Teratology Overdispersion Revisited, 304 10.2.4 Example: Repeated Responses on Similar Survey Items, 305 10.2.5 Item Response Models: The Rasch Model, 307 10.2.6 Example: Depression Study Revisited, 307 10.2.7 Choosing Marginal or Conditional Models, 308 10.2.8 Conditional Models: Random Effects Versus Conditional ML, 309 10.3 Extensions to Multinomial Responses or Multiple Random Effect Terms, 310 10.3.1 Example: Insomnia Study Revisited, 310 10.3.2 Bivariate Random Effects and Association Heterogeneity, 311 10.4 Multilevel (Hierarchical) Models, 313 10.4.1 Example: Two-Level Model for Student Advancement, 314 10.4.2 Example: Grade Retention, 315 10.5 Model Fitting and Inference for GLMMS, 316 10.5.1 Fitting GLMMs, 316 10.5.2 Inference for Model Parameters and Prediction, 317 Problems, 318 11. A Historical Tour of Categorical Data Analysis 325 11.1 The Pearson-Yule Association Controversy, 325 11.2 R. A. Fisher's Contributions, 326 11.3 Logistic Regression, 328 11.4 Multiway Contingency Tables and Loglinear Models, 329 11.5 Final Comments, 331 Appendix A: Software for Categorical Data Analysis 332 Appendix B: Chi-Squared Distribution Values 343 Bibliography 344 Index of Examples 346 Subject Index 350 Brief Solutions to Some Odd-Numbered Problems 357

About the Author

ALAN AGRESTI, PhD, is Distinguished Professor Emeritus in the Department of Statistics at the University of Florida. He has presented short courses on categorical data methods in thirty countries. Dr. Agresti was named "Statistician of the Year" by the Chicago chapter of the American Statistical Association in 2003. He is the author of two advanced texts, including the bestselling Categorical Data Analysis (Wiley) and is also the coauthor of Statistics: The Art and Science of Learning from Data and Statistical Methods for the Social Sciences.

Reviews

"Yes, I fully recommend the text as a basis for introductory course, for students, as well as non-specialists in statistics. The wealth of examples provided in the text is, from my point of view, a rich source of motivating ones own studies and work." (Biometrical Journal, Dec 2008) "This text does a good job of achieving its state goal, and we enthusiastically recommend it." (Journal of the American Statistical Association Sept 2008) "This book is very well-written and it is obvious that the author knows the subject inside out." (Journal of Applied Statistics, April 2008) "Provides an applied introduction to the most important methods for analyzing categorical data, such as chi-squared tests and logical regression." (Statistica 2008) "This is an introductory book and as such it is marvelous...essential for a novice..." (MAA Reviews, June 26, 2007)

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