First, thank you for taking the time to read and answer my question!

I am doing a multiple logistic regression analysis in Sigma stat. My dependent variable is dichotomous and my independent variable is categorical ranging from 0-5 however I set up my independent variable as a dichotomous variable (i.e. for category 3, 0=1,2,4,5, 1=3, for category 4, 0=1,2,3,5, 1=4 etc..).

When I try to analyze my data, it seems that Sigma stat just removes one of my independent variables and runs the analysis. I believe it's because of the way I set up my independent variable (since any one of the independent variables is mutually exclusive of the others).

Is my analysis still valid? And if not, how can I circumvent this problem?

Thanks again!