Statistical Analysis with Missing Data


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1 Statistical Analysis with Missing Data Second Edition RODERICK J. A. LITTLE DONALD B. RUBIN WILEY INTERSCIENCE A JOHN WILEY & SONS, INC., PUBLICATION
2 Contents Preface PARTI OVERVIEW AND BASIC APPROACHES 1. Introduction 1.1. The Problem of Missing Data, MissingData Patterns, Mechanisms That Lead to Missing Data, A Taxonomy of MissingData Methods, Missing Data in Experiments 2.1. Introduction, The Exact Least Squares Solution with Complete Data, The Correct Least Squares Analysis with Missing Data, Filling in Least Squares Estimates, Yates's Method, Using a Formula for the Missing Values, Iterating to Find the Missing Values, ANCOVA with MissingValue Covariates, Bartlett's ANCOVA Method, Useful Properties ofbartlett's Method, Notation, The ANCOVA Estimates of Parameters and Missing Y Values, ANCOVA Estimates of the Residual Sums of Squares and the Covariance Matrix of ß, 31
3 2.6. Least Squares Estimates of Missing Values by ANCOVA Using Only CompleteData Methods, Correct Least Squares Estimates of Standard Errors and One Degree of Freedom Sums of Squares, Correct Least Squares Sums of Squares with More Than One Degree of Freedom, 37 CONTENTS 3. CompleteCase and AvailableCase Analysis, Including Weighting Methods Introduction, CompleteCase Analysis, Weighted CompleteCase Analysis, Weighting Adjustments, Added Variance from Nonresponse Weighting, PostStratification and Raking To Known Margins, Inference from Weighted Data, Summary of Weighting Methods, AvailableCase Analysis, Single Imputation Methods Introduction, Imputing Means from a Predictive Distribution, Unconditional Mean Imputation, Conditional Mean Imputation, Imputing Draws from a Predictive Distribution, Draws Based on Explicit Models, Draws Based on Implicit Models, Conclusions, Estimation of Imputation Uncertainty Introduction, Imputation Methods that Provide Valid Standard Errors from a Single Filledin Data Set, Standard Errors for Imputed Data by Resampling, Bootstrap Standard Errors, Jackknife Standard Errors, Introduction to Multiple Imputation, Comparison of Resampling Methods and Multiple Imputation, 89
4 CONTENTS PART II LIKELIHOODBASED APPROACHES TO THE ANALYSIS OF MISSING DATA 6. Theory of Inference Based on the Likelihood Function 6.1. Review of LikelihoodBased Estimation for Complete Data, Maximum Likelihood Estimation, Rudiments of Bayes Estimation, LargeSample Maximum Likelihood and Bayes Inference, Bayes Inference Based on the Füll Posterior Distribution, Simulating Draws from Posterior Distributions, LikelihoodBased Inference with Incomplete Data, A Generally Flawed Alternative to Maximum Likelihood: Maximizing Over the Parameters and the Missing Data, The Method, Background, Examples, Likelihood Theory for Coarsened Data, Factored Likelihood Methods, Ignoring the MissingData Mechanism 7.1. Introduction, Bivariate Normal Data with One Variable Subject to Nonresponse: ML Estimation, MLEstimates, LargeSample Covariance Matrix, Bivariate Normal Monotone Data: SmallSample Inference, Monotone Data With More Than Two Variables, Multivariate Data With One Normal Variable Subject to Nonresponse, Factorization of the Likelihood for a General Monotone Pattern, Computation for Monotone Normal Data via the Sweep Operator, Bayes Computation for Monotone Normal Data via the Sweep Operator, Factorizations for Special Nonmonotone Patterns, 156
5 Vlll CONTENTS 8. Maximum Likelihood for General Patterns of Missing Data: Introduction and Theory with Ignorable Nonresponse Alternative Computational Strategies, Introduction to the EM Algorithm, The E and M Steps of EM, Theory of the EM Algorithm, Convergence Properties, EM for Exponential Families, Rate of Convergence of EM, Extensions ofem, ECM Algorithm, ECME and AECM Algorithms, PXEM Algorithm, Hybrid Maximization Methods, 186 LargeSample Inference Based on Maximum Likelihood Estimates Standard Errors Based on the Information Matrix, Standard Errors via Methods that do not Require Computing and Inverting an Estimate of the Observed Information Matrix, Supplemental EM Algorithm, Bootstrapping the Observed Data, Other Large Sample Methods, Posterior Standard Errors from Bayesian Methods, Bayes and Multiple Imputation Bayesian Iterative Simulation Methods, Data Augmentation, The Gibbs' Sampler, Assessing Convergence of Iterative Simulations, Some Other Simulation Methods, Multiple Imputation, LargeSample Bayesian Approximation of the Posterior Mean and Variance Based on a Small Number of Draws, Approximations Using Test Statistics, Other Methods for Creating Multiple Imputations, 214
6 CONTENTS PART III LIKELIHOODBASED APPROACHES TO THE ANALYSIS OF INCOMPLETE DATA: SOME EXAMPLES IX 11. Multivariate Normal Examples, Ignoring the MissingData Mechanism Introduction, Inference for a Mean Vector and Covariance Matrix with Missing Data Under Normality, The EM Algorithm for Incomplete Multivariate Normal Samples, Estimated Asymptotic Covariance Matrix of (06), Bayes Inference for the Normal Model via Data Augmentation, Estimation with a Restricted Covariance Matrix, Multiple Linear Regression, Linear Regression with Missing Values Confined to the Dependent Variable, More General Linear Regression Problems with Missing Data, A General RepeatedMeasures Model with Missing Data, Time Series Models, Introduction, Autoregressive Models for Univariate Time Series with Missing Values, Kaiman Filter Models, Robust Estimation Introduction, Robust Estimation for a Univariate Sample, Robust Estimation of the Mean and Covariance Matrix, Multivariate Complete Data, Robust Estimation of the Mean and Covariance Matrix from Data with Missing Values, Adaptive Robust Multivariate Estimation, Bayes Inferences for the t Model, Further Extensions of the t Model, Models for Partially Classified Contingency Tables, Ignoring the MissingData Mechanism Introduction, 266
7 X CONTENTS Factored Likelihoods for Monotone Multinomial Data, Introduction, ML Estimation for Monotone Patterns, Precision of Estimation, ML and Bayes Estimation for Multinomial Samples with General Patterns of Missing Data, Loglinear Models for Partially Classified Contingency Tables, The CompleteData Case, Loglinear Models for Partially Classified Tables, GoodnessofFit Tests for Partially Classified Data, Mixed Normal and Nonnormal Data with Missing Values, Ignoring the MissingData Mechanism Introduction, The General Location Model, The CompleteData Model and Parameter Estimates, ML Estimation with Missing Values, Details of the E Step Calculations, Bayes Computations for the Unrestricted General Location Model, The General Location Model with Parameter Constraints, Introduction, Restricted Models for the Cell Means, Loglinear Models for the Cell Probabilities, Modifications to the Algorithms of Sections and for Parameter Restrictions, Simplifications when the Categorical Variables are More Observed than the Continuous Variables, Regression Problems Involving Mixtures of Continuous and Categorical Variables, Normal Linear Regression with Missing Continuous or Categorical Covariates, Logistic Regression with Missing Continuous or Categorical Covariates, Further Extensions of the General Location Model, Nonignorable MissingData Models Introduction, 312
8 CONTENTS xi Likelihood Theory for Nonignorable Models, Models with Known Nonignorable MissingData Mechanisms: Grouped and Rounded Data, Normal Selection Models, Normal PatternMixture Models, Univariate Normal PatternMixture Models, Bivariate Normal PatternMixture Models Identified via Parameter Restrictions, Nonignorable Models for Normal RepeatedMeasures Data, Nonignorable Models for Categorical Data, 340 References 349 Author Index 365 Subject Index 371
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