Question: Negative day values for Survival Analysis
gravatar for Bnf83
5.9 years ago by
Bnf83150 wrote:

Hi guys

I'm applying Survival Analysis to some data. For the first time

I encountered negative values (negative days) relative to the clinical info " last contact days to".

Does anybody know the reason why days are reported as negative values? What does it mean -5 days?






survival analysis • 2.3k views
ADD COMMENTlink written 5.9 years ago by Bnf83150

I assume that the negative day values you're observing are in the raw data. In that case, you'll need to ask whomever coded the data originally to see what they mean by that. There's no a priori meaning to negative days.

ADD REPLYlink modified 5.9 years ago • written 5.9 years ago by Devon Ryan95k
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