You can try a linear model or a model with free time scores.
EFried posted on Friday, February 24, 2012 - 2:08 am
Linear doesn't fit, freeing time scores leads to conversion problems. Looking at the output, the variance of the quadratic growth factor was pretty similar, so I fixed it to zero which makes conversion possible now.
Would that be considered "overfitting", or does it make sense / is it common to use