Hi, I am getting negative test statistic for hausman test to check b/w random and fixed effects model. could anyone please write the command properly on how to use "xtoverid "
this is the Error - "must have ivreg2/ivreg29/ivreg28 version 2.1.15 or greater installed" which stata shows after i am running command " xtoverid" . i ran command "xtoverid" after calculating the roubst fe and re commands. could anyone help me out with this issue.