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Hi all,
On the topic of xtpoisson, is there an easy way to calculate the VPC? The reference I've been reading is here http://people.upei.ca/hstryhn/iccpoisson.ppt. But I'm having trouble making sense of it all. This is how far I've got: to calculate the VPC you use the upper/upper+lower formula ...

Thanks Chris. In the end, I started using using mlwin as opposed to mlwin through stata and seems to be working better.

Thanks for getting back to me!

I have a large dataset, >600000 observations in 24 clusters. I'm trying to just a random intercept model (no covariates) using runmlwin. I keep getting the error - "cannot allocate smatrix(fs)".

I'm sure this is a sample size issue, as when I take a random sample of 12,000 observations the model ...