[Gretl-users] Re: Check whether a series defines a panel dimension

On Mon, 9 Sep 2019, Allin Cottrell wrote: > Sorry, I haven't been following this very closely, but might it work just > to check whether the putative "crossdim_index_series" has correlation 1.0 > with $unit? And similarly for the built-in "time" if you want to check for > a putative panel-time variable. Whell, not necessarily. It may happen that the unit identifier variable doesn't have regular increments. Example: <hansl> nulldata 9 series tim = {1;2;3;1;2;3;1;2;3} series id = {1;1;1;2;2;2;101;101;101} setobs id tim --panel-vars eval corr($unit, id) </hansl>