I so sorry if I am sending plus an email. I did not know if you have
received last e-mails.
I have been spending several days and I did not found a solution.
I will be very happy if somebody can help me!
Applying this same syntax (sort variables �very small data base) on a bigger
data base, does not have effect. For example: I have about 4157 repeated
time unbalanced panel data (pooled data). N=4157 and T=18. Years: 1981-2001,
excepts 1991,1994,2001).