# Logistic Regression?

Can you use logistic regression if you have more than two options for the dependent variable. Instead of just a yes/no option I could have more than 2 options. I have 20+ predictor variables.

• Yes you can! Google for multinomial logistic regression. – Hossein Mar 23 '17 at 20:06
• @ilanman It's possible, but I expect that the OP meant exactly what the question said. – Glen_b Mar 23 '17 at 20:08
• @Alex is your response ordered categories (e.g. high, medium, low) or nominal categories (red, blue, yellow)? – Glen_b Mar 23 '17 at 20:10
• Glen_b♦ my response would be nominal – Alex Mar 23 '17 at 20:19

If you have more then two categories it's not logistic regression, but multinomial logistic regression (also known as multinomial regression). While logistic regression model is defined in terms of conditional odds of one category as compared to another, in multinomial model you compare $K-1$ categories to the $K$th category that serves as a "default" category. If your categories are ordered, you will use ordinal regression, that is a similar model but for ordered categories.