selecting controls in SAS

[chenyiwen1717]

Hi,

I have a dataset with cases and potential controls. I would like to select controls by matching age, race, sex and birth weight in 1:10. I used to select controls by creating index, for example, concatenate age|race|sex , and then use proc surveyselect. However, this method cannot satisfy my need since I need to matching birth weight in certain range, such as +/- 50 g. How can I select controls by matching exact variables and variables in a range? Thanks.

[kiranv_]

please show some input and output data, so that someone cal help you

[Doc_Duke]

Try a Google search for

SAS marching macro

There are a number of macros out there that will do tolerance matching on continuous variables.

Alternatively, you might consider propensity score matching.  That often performs better than the simple case-control approach you posited.