Hi Andr�,
Do you mean with age as an independent variable, and not as a dependent? Assuming this you can use the delta command as an option in prchange to specify the amount of discrete change in the independent variable. The default is a 1-unit change.
I believe you can do what asked for this way:
mlogit y age
prchange age, x(age=20) uncentered delta(20) // from 20 to 40
prchange age, x(age=40) uncentered delta(20) // from 40 to 60
Options meaning:
Delta(20)=20 unit change in age
X(age=20)=specify the starting point of age = 20
Uncentered = the change should be computed starting at the base value as specified by the x(#) option.
Best wishes,
Alexander Severinsen
-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of Andr� Paul
Sent: 15. februar 2006 11:12
To: [email protected]
Subject: st: prchange
Dear all,
In the "spost" pakage by Long & Freese, the command "prchange" enables us to measure the effect of discrete changes of the explanatory variables.
I have a question regarding this command:
Suppose I want to estimate a multinomial logit model, with "age" as a dependant variable, which ranges from 20 to 60. The "prchange" command will give me the effect on the categorial variable when "age" varies from 20 to 60 (If I got that right!).
Is there a way to obtain this effect for different variations of the variable? i.e if age varies from 20 to 40 and then from 40 to 60? I didn't find the answer in the help file...
Thanks,
Andr�
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