How to do 1:n case-control matching?

General
1

Hi,
I am doing a matched case-control study. I have got about half a million samples of which about ten thousand are cases. I have been trying to do 1:n case-control matching using MatchIt package in R. Unfortunately, I am not successful.

I was wondering if anyone can help me with any R packages to do 1:n case-control matching.

Thanks

2

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3

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