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Appendix A
tv-survey.sav. This is a hypothetical data file that concerns a survey conducted by a TV studio
that is considering whether to extend the run of a successful program. 906 r espondents were
asked whether they would watch the program under various conditions. Each row represents a
separate respondent; each column is a separate condition.
ulcer_recurrence.sav. This file contains partial information from a study designed to compare
the efficacy of two therapies for preventing the recurrence of ulcers. It provides a good
example of interval-censored data and has been presented and analyzed elsewhere (Collett,
2003).
ulcer_recurrence_recoded.sav. This file reorganizes the information in ulcer_recurrence.sav to
allow you model the event probability for each interval of the study rather than simply the
end-of-study event probability. It has been presented and analyzed elsewhere (Collett et
al., 2003).
verd1985.sav. This data file concerns a survey (Verdegaal, 1985). The responses of 15 subjects
to 8 variables were recorded. The variables of interest are divided into three sets. Set 1
includes age and marital,set2includespet and news,andset3includesmusic and live.
Pet is scaled as multiple nominal and age is scaled as ordinal; all of the other variables are
scaled as single nominal.
virus.sav. This is a hypothetical data file that concerns the efforts of an Internet service
provider (ISP) to determine the effects of a virus on its networks. They have tracked the
(approximate) percentage of infected e-mail traffic on its networks over time, from the
moment of discovery until the threat was contained.
wheeze_steubenville.sav. This is a subset from a longitudinal study of the health effects of
air pollution on children (Ware, Dockery, Spiro III, Speizer, and Ferris Jr., 1984). The data
contain r epeated binary measures of the wheezing status for children from Steubenville, Ohio,
at ages 7, 8, 9 and 10 years, along with a fixed recording of whether or not the mother was
a smoker during the first year of the study.
workprog.sav. This is a hypothetical data file that concerns a government works program
that tries to place disadvantaged people into better jobs. A sample of potential p rogram
participants were followed, some of whom were randomly selected for enrollment i n the
program, while others were not. Each case represents a separate program participant.