The medication dataframe consists of 1242 observations within 73 individuals
that were part of a placebo controlled clinical trial, as reported in Tomarken, Shelton, Elkins, and Anderson (1997).
The data were retrieved from the accompanied website of Singer & Willett (2003), at https://stats.idre.ucla.edu/other/examples/alda/.
medicationthe following variables are available:
id: subject indicator
treat: either placebo (0) or antidepressant (1)
time: number of days since trial start.
pos: positive affect. Higher scores indicate a more positive mood.
Singer, J.D., & Willett, J.B. (2003). Applied longitudinal data analysis. Modeling change and event occurence. NY: Oxford University Press, Inc.
Tomarken, A.J., Shelton, R.C., Elkins, L., & Anderson, T (1997). Sleep deprivation and anti-depressant medication: Unique effects on positive and negative affect. Poster session presented at the 9th annual meeting of the American Psychological Society, Washington, DC.