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st: Conditional logistic regression: how to
From
liliana <[email protected]>
To
[email protected]
Subject
st: Conditional logistic regression: how to
Date
Thu, 14 Nov 2013 06:59:42 -0800 (PST)
Dear statlist users,
I am trying to run a conditional logistic regression. The analysis consists
of studying the determinants of child mortality. Before running the
conditional logistic regression I should randomly select pairs from each
sample, consisting of one death reported during five years preceding the
survey and one birth that still survived at the survey time. Moreover, I
have also imputed the missing values of an explanatory variables, which
means that before the stata command I should insert the mi estimate: option.
What I have done in Stata is
set seed 8021
then I have declared my data to be survival data and then
sttocc, match(mortality), where mortality is a dummy variable assuming value
0 if the child died during five years preceding the survey.
Then I go with:
mi estimate: clogit y x1 x2, group(_set)
Stata tells me that
(regular variables _st _d _t _t0 unregistered because not in m=0)
groups (strata) are not nested within clusters
an error occurred when mi estimate executed clogit on m=1
r(459);
May you tell me what's wrong with these commands, please?
Thank you very much.
Best,
Liliana
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