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st: RE: Curious missing scalar after regress postestimation

From   "Martin Weiss" <>
To   <>
Subject   st: RE: Curious missing scalar after regress postestimation
Date   Tue, 14 Oct 2008 10:59:02 +0200

Works for me when I try it with another example. 

sysuse census, clear

tabulate region, gen(region)
regress death medage region2-region4 [aw=pop], noc vce(cluster  state)
scalar var_medage = _se[medage]
di var_medage
scalar est_medage = _coef[medage]
di est_medage

Sure you do not do anything in between storing and -display-ing that erases
your -scalar-s? Why not use packages like -ssc d parmest- or Stata`s -
estimates store- for this purpose?

BTW, probably dangerous to call the standard error of the OLS estimator
"var_...". Could lead to misinterpretations down the road...


-----Original Message-----
[] On Behalf Of Patrick P.
Sent: Tuesday, October 14, 2008 10:44 AM
Subject: st: Curious missing scalar after regress postestimation

I am running some simulations including a regress command and have come
across some curiosities with scalars.

I run the following commands:

    regress beta alpha [aweight=prec], nocons vce(cluster trial)

    scalar var_alpha = _se[alpha]
    scalar est_alpha = _coef[alpha]
    scalar r_sqrd = e(r2)

When I type scalar list, I get the following:

. scalar list
    r_sqrd =  .09759686
 est_alpha =  .42516408
 var_alpha =  .48875057

But, when I try to display the contents of scalar var_alpha, it appears to
only contain '.':

. disp var_alpha

Any thoughts on why this is? It's driving me mad!

Many thanks for your help,



Patrick Phillips
MRC Clinical Trials Unit
222 Euston Road
London NW1 2DA

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