Sorry that this error has been discussed before, each answer on stackoverflow seems specific to the data I'm attempting to run the following negative binomial m
I have a simulated data set with 5 rows, each representing a block of person-time, each with its own start and end date ('start' and 'end'). Each row has a visi
I have a dataset that contains the observations of 30 people and each of them had done 20 experiments. Suppose my data looks like this: ID trial reaction r
I've been looking for a way to conduct group-based trajectory modeling in R with no avail. Something along the lines of what PROC TRAJ (http://www.andrew.cmu.e