data_drug {LMest}

Dataset about marijuana consumption

Description

Longitudinal dataset derived from the National Youth Survey about marijuana consumption measured by ordinal variables with 3 categories with increasing levels of consumption (1 "never in the past year", 2 "no more than once in a month in the past year", 3 "more than once a month in the past year").

Usage

data(data_drug)

Format

A data frame with 51 observations on the following 6 variables.

V1

reported drug use at the 1st occasion

V2

reported drug use at the 2nd occasion

V3

reported drug use at the 3rd occasion

V4

reported drug use at the 4th occasion

V5

reported drug use at the 5th occasion

V6

frequency of the response configuration

Source

Elliot, D. S., Huizinga, D. and Menard, S. (1989) Multiple Problem Youth: Delinquency, Substance Use, and Mental Health Problems. New York: Springer.

References

Bartolucci, F. (2006) Likelihood inference for a class of latent Markov models under linear hypotheses on the transition probabilities. Journal of the Royal Statistical Society, series B, 68, 155-178.

Examples

data(data_drug)