Methadone Treatment of Heroin Addicts

Keywords: censored data, Cox regression.

Description

The data are the times, in days, that heroin addicts spend in a clinic. There are two clinics and the covariates are believed to affect the times spent in the clinic by addicts.

	Variable		Description
	Clinic		1 or 2
	Status		0 = still in clinic at end of study (censored) or 1 = departed from clinic
	Time		days spent in clinic
	Prison		1 = prison record or 0 = no record
	Dose		methadone dosage (mg/day)

Download

Data file (tab-delimited text)

Source

Caplehorn, J. (1991). Methadone dosage and retention of patients in maintenance treatment. Medical Journal of Australia, 154, 195-199.

Hand D.J., Daly F., Lunn A.D., McConway K.J., Ostrowski E. (1994). A Handbook of Small Data Sets. London: Chapman and Hall.

Analysis

This can be used as an interesting example of stratified Cox regression where stratification is done by clinic.