st: Using two cohorts of panel data together

[bai0022 <bai0022@flinders.edu.au>]

I am using two cohorts of panel data together. One has 3 waves, one as 
two waves. They are both
surveys of immigrants (the LSIA), collected about 5 years apart. What I 
want
to know is if anyone know under what conditions (Also what Stata 
commands) I can put them together and see
if they can be analysed as a single data set.

specifically with the panel data, the main issue is that
the stratification was different for the 2 surveys,

LSIA 1 - by 5 Visa eligibility categories and 50 region/country of birth.
LSIA 2 - by 12 Visa eligibility categories and 18 region of birth
categories.

So, what are implications for pooling the data?

Any suggestions and helps would be appreciated.

Bai

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