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Re: st: what is SIGMA2 _const in arima
Let me be clear about my first reply,
sigma is the residual standard error. To obtain
sigma squared, you need to square that.
Robert A. Yaffee, Ph.D.
Shirley M. Ehrenkranz
School of Social Work
New York University
2100 Linwood Ave.
Fort Lee, NJ
----- Original Message -----
From: Olga Gorbachev Melloni <firstname.lastname@example.org>
Date: Thursday, August 24, 2006 1:31 pm
Subject: st: what is SIGMA2 _const in arima
> I am trying to estimate a model, in which errors follow an MA(1). I
> panel data, and I assume that for each cohort, coefficients are the
> same. I
> arima y x if cohort==1935, ma(1) condition
> I have two questions:
> 1. when the estimation finished its run, it used BFGS and for the
> of the white-noise disturbance epsilon it showed instead of the
> '/sigma', I got SIGMA2 _const =0.10...
> what does this mean? I looked in the manual, but there is no
> mention of
> 2. When trying to predict the errors or the predicted values, I got
> an error
> message saying that the sample cannot include panels.
> Is there a way to get the predicted values and/or white-noise errors?
> thank you,
> * For searches and help try:
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> * http://www.stata.com/support/statalist/faq
> * http://www.ats.ucla.edu/stat/stata/
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