Hello gretl users, is there a command like "drop" (Stata) available in gretl? I would like to drop units from a panel data set with less than x observations. The reason is the following. Assume I have two units, A and B. For unit A I have a fully balanced panel with three consecutive observations from 2000 to 2002. For unit B I have only two obs for 2000 and 2002, respectively: Variable X: ----------- 2000: 10 #unit A 2001: 11 2002: 9 2000: 10 # unit B 2001: 2002: 13 If I translate these obs into a matrix, I obtain a vector V with five entries: V = { 10 11 9 10 13 } This even happens if I run: series pn = pnobs(A) smpl pnobs==pn --restrict --replace If one could drop these units from the variables by a "drop"-like command, this problem would not arise. Of course, alternatively one could store the restricted dataset temporarily and re-open it, but then lists and other stuff gets lost as well... Best, Artur