An Introduction to the Bootstrap BRADLEY EFRON Department of Statistics Stanford University and ROBERT J TIBSHIRANI Department of Preventative
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An Introduction to
the BootstrapBRADLEY EFRON
Department of Statistics
Stanford University
andROBERT J. TIBSHIRANI
Department of Preventative Medicine and Biostatistics and Department of Statistics, University of TorontoCHAPMAN & HALL
New York London
First published in 1993 by
Chapman
& Hall29 West 35th Street
New York, NY 10001 -2299
Published in Great Britain by
Chapman
& Hall2-6 Boundary Row
London
SE1 8HN
0 1993 Chapman & Hall, Inc.
Printed in the United States of America
All rights reserved. No part of this book may be reprinted or reproduced or utilized in any form or by any electronic, mechanical or other means, now known or hereafter invented, including photocopying and recording, or by an information storage or retrieval system, without permission in writing from the publishers. Library of Congress Cataloging-in-Publication DataEfron, Bradley.
An introduction to the bootstrap /Brad Efron, Rob Tibshirani. p. cm.Includes bibliographical references.
ISBN 0-412-0423 1-2
1. Bootstrap (Statistics) I. Tibshirani, Robert.
11. Title.
QA276.8.E3745 1993
519.5'44-dc20 93-4489
CIP British Library Cataloguing in Publication Data also available. This book was typeset by the authors using a Postscript (Adobe Systems Inc.) based phototypesetter (Linotronic300P). The figures were generated in Postscript using the
S data analysis language (Becker
et. al. 1988), Aldus Freehand (Aldus Corporation) and Mathematica (Wolfram Research Inc.). They were directly incorporated into the typeset document. The text was formatted using the LATEX language (Lamport, 1986), a version of TEX (Knuth, 1984). TOCHERYL, CHARLIE, RYAN AND JULIE
AND TO THE MEMORY OF
RUPERT
G. MILLER, JR.
Contents
Preface xiv
1 Introduction 1
1.1 An overview of this book 6
1.2 Information for instructors 8
1.3 Some of the notation used in the book 9
2 The accuracy of a sample mean
2.1 Problems
3 .Random samples and probabilities
3.1 Introduction
3.2 Random samples
3.3 Probability theory
3.4 Problems
4 The empirical distribution function and the plug-in
principle 3 14.1 Introduction 31
4.2The empirical distribution function 3 1
4.3The plug-in principle 35
4.4Problems 37
5 Standard errors and estimated standard errors 39
5.1 Introduction 39
5.2 The standard error of a mean 39
5.3Estimating the standard error of the mean 42
5.4Problems 43
viii CONTENTS6 The bootstrap estimate of standard error
6.1 Introduction
6.2 The bootstrap estimate of standard error
6.3 Example: the correlation coefficient
6.4 The number of bootstrap replications B
6.5 The parametric bootstrap
6.6 Bibliographic notes
6.7 Problems
7 Bootstrap standard errors: some examples
7.1 Introduction
7.2 Example 1: test score data
7.3 Example 2: curve fitting
7.4 An example of bootstrap failure
7.5 Bibliographic notes
7.6 Problems
8 More complicated data structures
8.1 Introduction
8.2 One-sample problems
8.3 The two-sample problem
8.4 More general data structures
8.5 Example: lutenizing hormone
8.6 The moving blocks bootstrap
8.7 Bibliographic notes
8.8 Problems
9 Regression models
9.1 Introduction
9.2 The linear regression model
9.3 Example: the hormone data
9.4 Application of the bootstrap
9.5 Bootstrapping pairs vs bootstrapping residuals
9.6 Example: the cell survival data
9.7 Least median of squares
9.8 Bibliographic notes
9.9 Problems
10 Estimates of bias
10.1 Introduction
CONTENTS ix
10.2 The bootstrap estimate of bias
10.3 Example: the patch data
10.4 An improved estimate of bias
10.5 The jackknife estimate of bias
10.6 Bias correction
10.7 Bibliographic notes
10.8 Problems
11 The jackknife 141
11.1 Introduction 141
11.2Definition of the jackknife 141
11.3Example: test score data 143
11.4Pseudo-values 145
11.5 Relationship between the jackknife and bootstrap 145 11.6Failure of the jackknife 148
11.7 The delete-d jackknife 149 11.8Bibliographic notes 149
11.9Problems 150
12 Confidence intervals based on bootstrap "tables"
12.1 Introduction
12.2 Some background on confidence intervals
12.3 Relation between confidence intervals and hypothe-
sis tests12.4 Student's t interval
12.5 The bootstrap-t interval
12.6 Transformations and the bootstrap-t
12.7 Bibliographic notes
12.8 Problems
13 Confidence intervals based on bootstrap
percentiles13.1 Introduction
13.2 Standard normal intervals
13.3 The percentile interval
13.4 Is the percentile interval backwards?
13.5 Coverage performance
13.6 The transformation-respecting property
13.7 The range-preserving property
13.8 Discussion
CONTENTS
13.9 Bibliographic notes
13.10 Problems
14 Better bootstrap confidence intervals
14.1 Introduction
14.2 Example: the spatial test data
14.3 The BC, method
14.4 The ABC method
14.5 Example: the tooth data
14.6 Bibliographic notes
14.7 Problems
15 Permutation tests 202
15.1 Introduction 202,
15.2 The two-sample problem 202
15.3Other test statistics 210
15.4Relationship of hypothesis tests to confidence
intervals and the bootstrap 21415.5
Bibliographic notes 218
15.6Problems 218
16 Hypothesis testing with the bootstrap 220
16.1 Introduction 220
16.2The two-sample problem 220
16.3Relationship between the permutation test and the
bootstrap 22316.4