I have 3 categorical independent variable and all the variables are more than 2 categories like 6 locations, 4 types, 6 maturity levels. Can I still use multiple regression? If so, how can I do that? If not, is there a better test for my experiment?
I was asked to clarify more: To explain more: I have 6 dependent variables and I want to see, for example if the location has an effect on my dependent variables. should I look at this effect one-by-one? Can I look the effect of 3 categorical independent variable on a dependent variable at the same time?