I had experimental percentage outcome data with a good deal of 0s and 100s (histogram for percentage outcome was U shaped). I used "fracreg logit" on these [0,1] data as well as some non-parametric methods. I've also explored beta regression after bumping the 0s and 100s larger and small, respectively. Now longitudinal data on the same outcome to look at some time effects are being considered. Are there mixed models for this kind of outcome in Stata?
The data are generated without a denominator for the percentage. There is a fixed resource that can be used during the experiment. Some use all of it, none of it, or some of it. How much gets used is the outcome variable.
The data are generated without a denominator for the percentage. There is a fixed resource that can be used during the experiment. Some use all of it, none of it, or some of it. How much gets used is the outcome variable.
Comment