Hi,   I have separate datasets for cases  (CASES) and controls (CONTROLS). I want to choose 3 controls per case and identify which controls were matched to each case. My matching variables are age (+- 2 years), gender (same gender) and service year (+-2 years). I want to have a data set, containing a strata variable linking the cases to the matched controls which looks like the following (attached):   CaseID ControlID Strata VAR1 Var2 Var3 100 121 1       100 122 1       100 127 1       155 877 2       155 114 2       155 447 2         Thank you in advance for your help and suggestions. ... View more

Dear SAS experts,   For my matched case-control study, I’m preparing my data for a conditional logistic regression.  Using the matching variables, I’ve got a dataset containing the details for cohort (cases and controls identified). At this stage I know my cases and the controls. However, I do not know which controls were matched to which case. I need to make risk sets or strata so that I can perform conditional logistic regression.    Each case and control have unique identifying variable, I want to identify the controls matched to each case. Could you please help me how I can link the cases to their matched controls and assign them a specific id for each? My matching ration is 1:3.   Looking forward to hearing from you.  Thank you,   ... View more