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07-31-2008 12:22 PM

I have to calculate a sample size for a logistic regression polytomic multifactorial.

The ordinal response has 3 modalities (mild, moderate, severe)

There are 9 binary (yes/no) variables to include in the model and 1 variable with 3 modalities.

Thanks by advance.

The ordinal response has 3 modalities (mild, moderate, severe)

There are 9 binary (yes/no) variables to include in the model and 1 variable with 3 modalities.

Thanks by advance.

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Posted in reply to Cyril_FR

08-06-2008 12:02 PM

I think that the PROC SAS to do that does not exist yet but i found an article (http://www.childrens-mercy.org/stats/weblog2004/OrdinalLogistic.asp) where there is the formula to calculate the sample size.