Programming the statistical procedures from SAS

Weighted Kaplan Meier

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Occasional Contributor
Posts: 6

Weighted Kaplan Meier

Dear communities,

 

I am wondering if anyone can answer this question:

 

I want to get the weighted Kaplan Meier survival estimation/curve through Proc Phreg with "product-limit" option specified. However, I cannot find the background calculation/formula that SAS used to generate the survival estimation, could you point the paper I can refer to? The weight I am using is the ratio of the 1: M matched (case/control). 

 

Thank you!

SAS Super FREQ
Posts: 3,304

Re: Weighted Kaplan Meier

I don't know the answer to your exact question, but in case it helps, a general weighted cumulative distribution (similarly, a survival distribution) is adjusted by weights as explained in the article "Weighted percentiles."

Occasional Contributor
Posts: 6

Re: Weighted Kaplan Meier

Thank you! I will look into it.

 

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