mental: Mental Health Trial Data
Description
The data is obtained from a trial in which chronically ill
mental health patients were randomised across two treatments: placebo
and an active drug. A questionnaire instrument was used to assess each
patient's mental state at weeks 0, 1, 2, 4, 6 and 8
post-randomisation, a high recorded score implying a severe
condition. Some of the 100 patients dropped out of the study for
reasons that were thought to be related to their mental state, and
therefore potentially informative; others dropped out for reasons
unrelated to their mental state.format
A balanced data set with respect to the times at which
observations recorded. The data consists of the following variables on
each patient:
{patient identifier (1,2,...,100)}
- [,2] - Y.t0 -
{mental state assessment in week 0
(coded NA if missing)}
- [,3] - Y.t1 -
{mental state assessment in week 1}
- [,4] - Y.t2 -
{mental state assessment in week 2}
- [,5] - Y.t4 -
{mental state assessment in week 4}
- [,6] - Y.t6 -
{mental state assessment in week 6}
- [,7] - Y.t8 -
{mental state assessment in week 8}
- [,8] - treat -
{treatment allocation (0=placebo;
1=active drug)}
- [,9] - n.obs -
{number of non-missing mental state
assessments}
- [,10] - event.time -
{imputed dropout time in weeks
(coded 8.002 for completers)}
- [,11] - status -
{censoring indicator (0=completer
or non-informative dropout, 1=potentially informative dropout)}