Mine,
Quoting Mine Zeynep Senses <[email protected]>:
> Hi,
>
> Can somebody tell me the difference between:
> xtivreg y x1 x2 (x3 = x4) if (year==1978| year==1981), fe(ppn)
> versus
> taking three year differences of the data first and then running:
>
> ivreg y x1 x2 (x3 = x4) if year==1981
>
> I thought that when you have only two time periods running fixed
> effects
> is exactly same as running it in time differences.
> I did all my analysis the first way and then it turned out I have
> to
> cluster so I switched to ivreg and everything changed!!!
>
> So I need help desperately... If there is another problem than
> writing the
> code wrong, any intuition on what the first regression tells???
Can you post the code you used, and the basic regression results? It's
hard to tell what's going on just by looking at the above.
--Mark
>
>
> mine
> *
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>
Prof. Mark Schaffer
Director, CERT
Department of Economics
School of Management & Languages
Heriot-Watt University, Edinburgh EH14 4AS
tel +44-131-451-3494 / fax +44-131-451-3008
email: [email protected]
web: http://www.sml.hw.ac.uk/ecomes
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