<>
" Does x or y contain values that are 0 or less?"
In the case below, this seems not to be the problem...
*************
vers 10.1
sysuse auto, clear
//no zeroes in est sample
su mpg length turn
qui{
gen logmpg=log(mpg)
gen loglength=log(len)
gen logturn=log(turn)
}
reg mpg length turn
mfx, eyex
reg logmpg loglength /*
*/ logturn, noheader
*************
HTH
Martin
-----Ursprüngliche Nachricht-----
Von: [email protected] [mailto:[email protected]] Im Auftrag von Maarten buis
Gesendet: Dienstag, 8. September 2009 16:21
An: [email protected]
Betreff: Re: st: AW: AW: Creating a variable taking the value of elasticity
--- On Tue, 8/9/09, Dorothy Bridges wrote:
> But what I don't understand is: the second method
> (using mfx, eyex) gives me a different value than
> the first method (storing the coefficient on x
> from *regress lny lnx*). Why?
Does x or y contain values that are 0 or less? In
that case you are creating missing values by
creating lnx and/or lny.
-- Maarten
--------------------------
Maarten L. Buis
Institut fuer Soziologie
Universitaet Tuebingen
Wilhelmstrasse 36
72074 Tuebingen
Germany
http://www.maartenbuis.nl
--------------------------
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