Hello,

I have 2 questions if anyone can help:

1) I have 2 groups (treatment and control), and the outcome is categorical (8 categories). I used chi2 square test and found significant difference between treatment and control groups. But now I want to know which one of the categories was affected the most by the intervention (treatment). How can I know this statistically?

2) Now that I thought of multinomial logistic regression to answer the above-mentioned question 1, if I'm right, on what basis shall I choose the reference category? There is no baseline value or category to compare others to, because the main aim is to compare treatment to control. I found it hard to interpret.