Hello,
What is exactly the question you want us to answer?
Do you want an estimation algorithm that says :
With 1% of control group, 22% of the the match paired controls (matched to test) are being used as match paired controls for more than 1 test case.
And with X% of control group, Y% of the the match paired controls (matched to test) are being used as match paired controls for more than 1 test case.
??
Or do you just want to achieve that each control is used only once?
In the latter case, what is the problem with using all 12 MM controls? Is it taking too long?
Also, you can work in multiple iterations :
> If a control is used 5 times, ... then only retain the best match (minimal multivariate distance between test and control).
> Remove all controls that have already been used from the controls group > Remove all test cases that already have a match from the test group
> do a second run of your matching with PROC MODECLUS
> repeat this until all test cases have a match with a control case
> ( you can report about the test cases that have not found a "good" match. )
The above way, every control that is matched to a test case is used only once !
Thanks,
Koen
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