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Re: st: Could Stata give the variance of the parameter estimates?


From   Maarten buis <maartenbuis@yahoo.co.uk>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Could Stata give the variance of the parameter estimates?
Date   Tue, 7 Jul 2009 20:48:29 +0000 (GMT)

--- Crystal wrote:
> -matrix list e(v)- doesn't work 

e(v) won't but e(V) will, note the capital letter V.

> I am going to use these var and covar to  
> calculate the standard error for other factor (let's say SE(Mij)),  
> according to a given fomular. But how could I tell if the Mij is  
> significant at the 5% level, according to the calculated SE(Mij)?

The standard error is nothing other than the standard deviation
of the sampling distribution, so the answer  depends on what you 
know about the sampling distribution. A common answer is that
you think that the sampling distribution is Gaussian (normal),
in that case see: Buis, Maarten L. (2007) Stata tip 54: Where did 
my p-values go? The Stata Journal, 7(4):584--586.
http://home.fsw.vu.nl/m.buis/wp/pvalue.html . But a Gaussian
sampling distribution is often not the appropriate sampling 
distribution (think for example of chi square, F, and t test).

-- Maarten

-----------------------------------------
Maarten L. Buis
Institut fuer Soziologie
Universitaet Tuebingen
Wilhelmstrasse 36
72074 Tuebingen
Germany

http://home.fsw.vu.nl/m.buis/
-----------------------------------------


      

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