topic Re: Model Fitting and empty cells in SAS Procedures

Model Fitting and empty cells

deleted_user — Tue, 10 Jun 2008 08:15:00 GMT

Hello. I would like to do a logistic model but in my 2X2 tables, some cells are empty so my proc logistic doesn't work. Can anyone tell me what I can do? What parameters do I have to change in my proc logistic ? Or do I have to use another procedure?

Thank you for your help.

Valérie

Re: Model Fitting and empty cells

deleted_user — Wed, 11 Jun 2008 00:11:14 GMT

David Hand @ M2005 Conference Proceedings; I couldn't find a link for this resource about pattern discovery. One category of failings is poor data quality like "missing, incomplete or outdated values". Which seems to be your problem.

Re: Model Fitting and empty cells

deleted_user — Wed, 11 Jun 2008 07:03:20 GMT

Thank you for your answer but I was not clear. In fact, I'm working on a disease and there are several factors that could explain it. I have very few patients and with some factors, when I do the 2 x 2 table, there is an empty cell.

Usually, you are not allowed to introduce these factors in a logistic model, so I never do it, but some of these factors are really important and I am lookin for a way to build a model that includes them...

Re: Model Fitting and empty cells

deleted_user — Thu, 12 Jun 2008 06:13:22 GMT

I still think that it is a problem of managing missing values rather than finding a tip in syntax of proc logistic.