Case control matching, probably implementing the idea of propensity scores
R
matchIT
Matching
optmatch optmatch presentation1; optmatch presentation2;
SAS
gmatch,vmatch,dist
a sugi paper 165-29: Performing a 1:N Case-Control Match on Propensity Score
PaperOn the Estimation and Use of Propensity Scores in Case-Control and Case-Cohort Studies
[using] cases plus controls in a case-control study... should give consistent estimates of the true propensity score under the null hypothesis, but not otherwise.
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