Re: st: gen lag variable

["Radu Ban" <raduban@gmail.com>]

in this case you have to use the -gen- instead of the -egen- command.

2006/8/2, irodriguez <irodriguez@utdt.edu>:
> I have a panel data for 1200 firms by year (10 years for each firm)
> I need to create a lagged variable of one called  roa but it must be lagged
> for each firm
> I tried with
> by empresa: egen lagroa= roa[_n-1]
> but the command give me this error: r(198)
> What can I do?
> Thanks
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