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From: J.k on 4 Mar 2010 11:26
I've run into a question regarding how PHREG functions when using the
strata statement to generate risk sets for a conditional logistic
regression modeling match case control data (1:N). Each strata group
originally had at least one case and one control. However after
applying an exclusion criteria some of the risk sets lost their only
case or only control. These groups with no event or censored values
seem to be still included by PHREG. Should PHREG have removed them
automatically? Do I need to remove them prior to calling the
procedure or should they be left in the model? It seems to me that
all 35 of the groups should be excluded but I'm more of a programmer
than a statistician. Any comments would be greatly appreciated.
Thanks!

Model Information

Data Set WORK.X_MASTERFILE
Dependent Variable status
Censoring Variable CC_STATUS Case/control status
Censoring Value(s) 0
Ties Handling BRESLOW


Number of Observations Read 7510
Number of Observations Used 7510

Summary of the Number of Event and Censored Values


Percent
Pattern Total Event Censored Censored Freq

1 1 0 1
100.00 4
2 1 1 0
0.00 1
3 2 0 2
100.00 30
4 2 1 1
50.00 520
5 3 1 2 66.67
2135
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