Re: st: Conditional logistic regression: how to

[Steve Samuels <sjsamuels@gmail.com>]

On Nov 14, 2013, at 8:59 AM, liliana wrote:

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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