A subset of unpublished data from Hall, Havassy, and Wasserman (1990) measuring the relation between the number of days until relapse to cocaine use and several predictors that might be associated with relapse in a sample of 104 newly abstinent cocaine users who recently completed an abstinence-oriented treatment program. Former cocaine users were followed for up to 12 weeks post-treatment or until they used cocaine for 7 consecutive days. Self-reported abstinence was confirmed at each interview by the absence of cocaine in urine specimens.
Format
A person-period data frame with 1248 rows and 7 columns:
idParticipant ID.
daysNumber of days until relapse to cocaine use or censoring. Relapse was defined as 4 or more days of cocaine use during the week preceding an interview. Study dropouts and lost participants were coded as relapsing to cocaine use, with the number of days until relapse coded as occurring the week after the last follow-up interview attended.
censorCensoring status (0 = relapsed, 1 = censored).
needleBinary indicator for whether cocaine was ever used intravenously.
base_moodTotal score on the positive mood subscales (Activity and Happiness) of the Mood Questionnaire (Ryman, Biersner, & LaRocco, 1974), taken at an intake interview during the last week of treatment. Each item used a five point Likert score (ranging from 0 = not at all, to 4 = extremely).
followupWeek of follow-up interview.
moodTotal score on the positive mood subscales (Activity and Happiness) of the Mood Questionnaire (Ryman, Biersner, & LaRocco, 1974), taken during follow-up interviews each week post-treatment. Each item used a five point Likert score (ranging from 0 = not at all, to 4 = extremely).
Source
Hall, S. M., Havassy, B. E., & Wasserman, D. A. (1990). Commitment to abstinence and acute stress in relapse to alcohol, opiates, and nicotine. Journal of Consulting and Clinical Psychology, 58, 175–181. https://doi.org/10.1037//0022-006x.58.2.175
Note
Hall, Havassy, and Wasserman (1990) measured time to relapse in weeks, not days; however, to use these data to illustrate imputation strategies, Singer and Willett (2003) converted the weekly relapse information into days, then jittered these event times, effectively converting them from discrete-time to continuous-time. Additionally, Hall, Havassy, and Wasserman (1990) do not report following cocaine users in their study, thus, this appears to be unpublished data.
References
Ryman, D. H., Biersner, R. J., & La Rocco, J. M. (1974). Reliabilities and validities of the Mood Questionnaire. Psychological Reports, 35, 479-484. https://doi.org/10.2466/pr0.1974.35.1.479