st: xtmixed to estimate the effect of id and time t

[Song Nhac <songnhac@gmail.com>]

Dear Statalist,

I have an unbalanced data set with id is firms' id and time t, I would
like to measure the effect of unobservable part- but the random effect
command just assumes that time-invariance and predict results based on
the firms' id. So if I want to measure the effect of both id and time,
I could use the command xtmixed? it will allow the effect vary by time
or not?

My command is:
xtmixed y x1 x2 || id: || t:

Thank for your attention and support.

Regards,
Song Nhac
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