smoking {geecure}

A Smoking Cessation Data

Description

The original data consist of 223 people enrolled in the study between November 1986 and February 1989 from 51 zip codes in the southeastern corner of Minnesota in the United States (Banerjee and Carlin, 2004). In this study, smokers were randomly assigned to one of two treatment groups: smoking intervention (SI) group or usual care (UC) group. The survival time is defined as the time (in years) required for a failed quitter to resume smoking. The people residing in the area with the same zip code form a cluster and may be spatially correlated due to the shared environment.

Usage

data(smoking)

Format

Observed covariates include

SexF

0 = male, 1 = female.

Duration

duration as smoker in years.

SI.UC

intervention type: 1 = smoking intervention (SI), 0 = usual care (UC).

F10Cigs

the average number of cigarettes smoked per day over the last 10 years (rounded).

Relapse

1 = relapse, 0 = no relapse.

Timept1

the time of study entry.

Timept2

the time of resume smoking.

Zip

51 zip codes in the southeastern corner of Minnesota.

References

Banerjee, S. and Carlin, B. P. (2004) Parametric spatial cure rate models for interval-censored time-to-relapse data. Biometrics, 60: 268-275.