Tuesday, February 5, 2008

When you consult, be sure you know what your labels mean

In a recent project, I fit a varying slopes and intercepts model to data that was organized into replicated experiments, with several replications at each timepoint for several timepoints. Turns out, the only relationship between units labeled "Run 1" was the label. Nothing else. In this case, it turned out a simple linear regression was the more appropriate model.