Here is the command:

tsset GVKEY_n Year
rolling sd_NIBE=r(sd), window (4) clear : su NetIncome

And Stata returns this:
________________

-> GVKEY_n = 100135

Rolling replications (16)
----+--- 1 ---+--- 2 ---+--- 3 ---+--- 4 ---+--- 5
................

-> GVKEY_n = 100148

Rolling replications (16)
----+--- 1 ---+--- 2 ---+--- 3 ---+--- 4 ---+--- 5
................

-> GVKEY_n = 100149

Rolling replications (2098001)
----+--- 1 ---+--- 2 ---+--- 3 ---+--- 4 ---+--- 5
.................eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee 50
eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee 100
eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee 150
eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee 200
eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee 250
eeeeeeeeeeeeeeeeeeee--Break--



After it acting weird i have to stop it and if i didnt stop it can go on for half an hour. Is there somethign wrong with my data ?