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st: AW: question

From   "Martin Weiss" <[email protected]>
To   <[email protected]>
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)


-----Ursprüngliche Nachricht-----
Von: [email protected]
[mailto:[email protected]] Im Auftrag von Tunga Kantarci
Gesendet: Dienstag, 3. November 2009 14:38
An: [email protected]
Betreff: st: question


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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