duncan {aspect}

Duncan dataset

Description

At 4 points in time the objects (n = 1204 adolescents) were asked to rate cigarette, marijuana, and alcohol consumption on a 5-point scale.

Usage

galo

Format

Data frame with marijuana (POT), cigarette (CIG), and alcohol (ALC) consumption.

Category labels:

1 ... never consumed

2 ... previous but no use over the last 6 months

3 ... current use of less than 4 times a month

4 ... current use of between 4 and 29 times a month

5 ... current use of 30 or more times a month

References

Duncan, S. C., Duncan, T. E., and Hops, H. (1998). Progressions of alcohol, cigarette, and marijuana use in adolescence. Journal of Bahavioral Medicine, 21, 375-388.

Examples

   data(duncan)
   duncan