covariate

  1. M

    HOW do I insert a baseline covariate in repeated GLM?

    Am I doing something wrong? Using repeated GLM. Two groups, experiment and control. Dependent is a score on a scale. Data (the same score on the scale) are collected pre intervention and two post-tests. I am going to use the pre-test scores as a covariate to correct for possible...
  2. D

    Longitudinal analysis - what to do with the baseline data?

    Hi, I have posted previously but got no response - so I am trying to narrow my search field down and articulate my questions better. If I am doing a longitudinal analysis looking at the trajectory of a dependent variable (y) over time (x) - but I have baseline measures of y at x=0-1 to...