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st: AW: question


From   "Martin Weiss" <martin.weiss1@gmx.de>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: AW: question
Date   Tue, 3 Nov 2009 14:54:49 +0100

<> 

You can always have -display- show the relevant estimates, but you won`t get
a standard error then:


*************
sysuse auto, clear
reg mpg weight length
di exp(_b[_cons]+_b[length]*15.3) /* 
*/ *exp(e(rss)/e(df_r)/2)
*************



HTH
Martin


-----Ursprüngliche Nachricht-----
Von: owner-statalist@hsphsun2.harvard.edu
[mailto:owner-statalist@hsphsun2.harvard.edu] Im Auftrag von Tunga Kantarci
Gesendet: Dienstag, 3. November 2009 14:38
An: statalist@hsphsun2.harvard.edu
Betreff: st: question

Hello,

I wish to calculate a figure where I call coefficient estimates and
residuals sum of squares and degrees of freedom. All these quantities are
from the stata estimation output. When I run the relevant command "nlcom
exp(_b[_cons]+_b[income]*15.3)*exp(e(rss)/e(df_r)/2)" I get the error "could
not calculate numerical derivative". This is perhaps because e(rss) and
e(df_r) are not estimates. (As Maarten pointed out yesterday actually)

1. Does this mean that in the nlcom command I am only allowed to specify
coefficient estimates? 
2. How can I achieve what I want to achieve: I wish to call figures into the
stated command I am running. 

Thanks in advance. 


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