Are the 20 questions designed to be items in a scale? Are you sure that the response scale is severely discrepant from interval level?
Art mac55 wrote: > I have a questionnaire with about 20 questions that will result in > ordered categorical variables. I also have about 10 background > questions related to demographics and background. MY outcome is > dichotomous. > > How can I build a logistic regression model with so many ordinal > categorical variables. The amount of dummy variables required (about > 3-4 per question) would make the model unstable. > > My question is what is the best way to proceed with this data. Can > they be entered as continuous variables so long as there is a linear > relationship with the log odds? Or should I just build a model with > the background questions and adjust the 20 variables with those > factors. Of course this will miss a fair amount of confounding and > interaction. > > I know a lot of this is vague without the clinical > context.....sorry...... > > mcap . . ================================================================= Instructions for joining and leaving this list, remarks about the problem of INAPPROPRIATE MESSAGES, and archives are available at: . http://jse.stat.ncsu.edu/ . =================================================================
