[Gretl-users] Number of observations in OLS
I have 20 quarter observations from 1981:1 to 1990:4
When I run an OLS-estimation with three dummy variables yt = ß0 + ß1*t + ß2
*D2 + ß3 *D3 + ß4 *D4 + ut
I get a result with the titel « Model x : OLS, using observations 1986
:2-1990 :2 (T17). »
It is not clear to me why Gretl takes 17 observations instead of 20 to run
the OLS estimation.
Thank you in advance
Raul
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