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st: RE: nl estimation with repeated data

From   "FEIVESON, ALAN H. (AL) (JSC-SD) (NASA)" <>
To   "''" <>
Subject   st: RE: nl estimation with repeated data
Date   Wed, 18 Sep 2002 08:34:08 -0500

Xavier -

Interesting enough, I tried -nl- with cluster() and it didn't give an error
- but it gave the same standard errors as it did without the cluster()
option. This sounds as if Stata Corp. meant for -nl- to have a cluster()
option, but forgot to put it in!

 One way to get around this would be to write your own ml-program with
normally distributed errors around the mean which is your nonlinear function
of the parameters. Stata's ml processor allows for robust standard errors
with clustering.

Al Feiveson

-----Original Message-----
From: VIVIAND Xavier []
Sent: Monday, September 16, 2002 10:46 AM
Subject: st: nl estimation with repeated data

Dear StataList,

I would like to fit an Emax model (E0-((Emax.C^n)/(EC50^n+C^n)) where
several data are available for each patient.
Unfortunately, the nl procedure does not include a cluster option.
Does someone know how to do it ?
Sincerely yours,


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