Statistics for Biology and Health
Series Editors
M. Gail, K. Krickeberg, J. Samet, A. Tsiatis, W. Wong
David G. Kleinbaum
Mitchel Klein
Survival Analysis
A Self-Learning Text
Second Edition
David G. Kleinbaum
Department of Epidemiology
Rollins School of Public Health at
Emory University
1518 Clifton Road NE
Atlanta GA 30306
Email: dkleinb@sph.emory.edu
Mitchel Klein
Department of Epidemiology
Rollins School of Public Health at
Emory University
1518 Clifton Road NE
Atlanta GA 30306
Email: mklein@sph.emory.edu
Series Editors
M. Gail
National Cancer Institute
Rockville, MD 20892
USA
K. Krickeberg
Le Cha¨telet
F-63270 Manglieu
France
A. Tsiatis
Department of Statistics
North Carolina State University
Raleigh, NC 27695
USA
Wing Wong
Department of Statistics
Stanford University
Stanford, CA 94305
USA
J. Samet
Department of Epidemiology
School of Public Health
Johns Hopkins University
615 Wolfe Street
Baltimore, MD 21205
USA
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Library of Congress Control Number: 2005925181
Printed on acid-free paper.
ISBN-10: 0-387-23918-9
ISBN-13: 978-0387-23918-7
© 2005, 1996 Springer Science+Business Media, Inc.
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Survival Analysis
A Self-Learning Text
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David G. Kleinbaum Mitchel Klein
Survival Analysis
A Self-Learning Text
Second Edition
To
Rosa Parks
Nelson Mandela
Dean Smith
Sandy Koufax
And
countless other persons, well-known or unknown,
who have had the courage to stand up for their beliefs for the
benefit of humanity.
Preface
This is the second edition of this text on survival analysis,
originally published in 1996. As in the first edition, each chap-
ter contains a presentation of its topic in “lecture-book” for-
mat together with objectives, an outline, key formulae, prac-
tice exercises, and a test. The “lecture-book” format has a
sequence of illustrations and formulae in the left column of
each page and a script in the right column. This format allows
you to read the script in conjunction with the illustrations and
formulae that high-light the main points, formulae, or exam-
ples being presented.
This second edition has expanded the first edition by adding
three new chapters and a revised computer appendix. The
three new chapters are:
Chapter 7. Parametric Survival Models
Chapter 8. Recurrent Event Survival Analysis
Chapter 9. Competing Risks Survival Analysis
Chapter 7 extends survival analysis methods to a class of sur-
vival models, called parametric models, in which the distri-
bution of the outcome (i.e., the time to event) is specified in
terms of unknown parameters. Many such parametric models
are acceleration failure time models, which provide an alter-
native measure to the hazard ratio called the “acceleration
factor”. The general form of the likelihood for a parametric
model that allows for left, right, or interval censored data is
also described. The chapter concludes with an introduction
to frailty models.
Chapter 8 considers survival events that may occur more than
once over the follow-up time for a given subject. Such events
are called “recurrent events”. Analysis of such data can be
carried out using a Cox PH model with the data layout aug-
mented so that each subject has a line of data for each re-
current event. A variation of this approach uses a stratified
Cox PH model, which stratifies on the order in which recur-
rent events occur. The use of “robust variance estimates” are
recommended to adjust the variances of estimated model co-
efficients for correlation among recurrent events on the same
subject.
viii
Preface
Suggestions
for Use
Chapter 9 considers survival data in which each subject can
experience only one of several different types of events (“com-
peting risks”) over follow-up. Modeling such data can be car-
ried out using a Cox model, a parametric survival model or a
model which uses cumulative incidence (rather than survival).
The Computer Appendix in the first edition of this text has
now been revised and extended to provide step-by-step in-
structions for using the computer packages STATA (version
7.0), SAS (version 8.2), and SPSS (version 11.5) to carry out
the survival analyses presented in the main text. These com-
puter packages are described in separate self-contained sec-
tions of the Computer Appendix, with the analysis of the same
datasets illustrated in each section. The SPIDA package used
in the first edition is no longer active and has therefore been
omitted from the appendix and computer output in the main
text.
In addition to the above new material, the original six chap-
ters have been modified slightly to correct for errata in the first
edition, to clarify certain issues, and to add theoretical back-
ground, particularly regarding the formulation of the (partial)
likelihood functions for the Cox PH (Chapter 3) and extended
Cox (Chapter 6) models.
The authors’ website for this textbook has the following web-
link: http://www.sph.emory.edu/∼dkleinb/surv2.htm
This website includes information on how to order this
second edition from the publisher and a freely downloadable
zip-file containing data-files for examples used in the text-
book.
This text was originally intended for self-study, but in the nine
years since the first edition was published, it has also been ef-
fectively used as a text in a standard lecture-type classroom
format. The text may also be use to supplement material cov-
ered in a course or to review previously learned material in
a self-instructional course or self-planned learning activity.
A more individualized learning program may be particularly
suitable to a working professional who does not have the time
to participate in a regularly scheduled course.