Case:Control Matching with Conditions

[Sujithpeta]

Hello SAS World,

I'm trying to find a best matching technique, I found the following SAS Macro (Reducing Bias in a Propensity Score Matched-Pair Sample Using Greedy Matching Techniques) to help me do greedy matching. The Macro helps me to do basic matching but I can't specify certain conditions.

I want the case and control to matched based on the variables "Gender", "Age", "CCI Score" & "Cost". I want to tell SAS match based on the criterias in following order.

1. First, match same gender.
2. Second, not to consider any control for a case if the "Cost" difference between case and potential control is more than +/- 20%
3. Third, of the controls within +/- 20% use the closest propensity score to create a match.

Thanks a ton in advance!

--Sujith

[tamhane]

Here are some papers

1. Using SASÒ to Match Cases for Case Control Studies by Kawabata et al.

2. Using SAS® Software to Perform a Case-Control Match on Propensity Score in an Observational Study by Parsons.

3. SAS® Programs to Select Controls for Matched Case-Control Studies by Matthews and Brill

4. Matching Data Using SAS! Programming and Human Judgment by Go.

5. Simplified Matched Case-Control Sampling using PROC SURVEYSELECT by Disekar

6. Incidence-Density Sampling: Alternative Programming Approaches to Achieve the Same End by Gately and Tumbull

7. Automating the Selection of Controls in Case-Control Studies by Mounib

8. An Introduction to Matching and its Application using SAS® by Mandrekar