Hi, I have data on a group of subjects in different years. I should assume that observations regarding different individuals are independent but observations for the same individual in different years are not and I would like to have an estimated standard error (and variance-covariance matrix) taking into account this problem.
More in general is there a way in R to run a (robust)regression having different groups in the observations and specifying that the observation are independent across groups but not necessarily independent within groups? Thanks a. ______________________________________________ [EMAIL PROTECTED] mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
