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st: Initial Values for NL Estimation with parmby
From
Schöler, Lisa <[email protected]>
To
"[email protected]" <[email protected]>
Subject
st: Initial Values for NL Estimation with parmby
Date
Tue, 25 Dec 2012 17:27:32 +0000
Dear Statalist,
I am trying to run an nl estimation with parmby. This is my code
parmby "nl (installs= {b0}/(1+exp({-b1}-{b2}*t)))",by(group_id) saving(installsneuTMS,replace)
This works well. Now I want to set my intial values. I have read the help and found that I can set intial values to absolute numbers, like this
parmby "nl (installs= {b0}/(1+exp({-b1}-{b2}*t))), initial (b0 1000)",by(group_id) saving(installsneuTMS,replace)
But what I want to do ist set the intial value equal to the numbers of another variable, depending on the group_id (intital values = VariableX).
Can anybody tell me how to do this?
Merry Christmas
Lisa
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