Hi, I noticed that there doesn't seem to be an ids option for the zelig function when the model is oprobit, does anyone know a way to cluster the errors given by the zelig model? Or know of a function from another package that would do the trick? Thanks, John. - Zelig Mailing List, served by Harvard-MIT Data Center Send messages: zelig(a)lists.gking.harvard.edu [un]subscribe Options: http://lists.gking.harvard.edu/?info=zelig Zelig program information: http://gking.harvard.edu/zelig/