I'm using logistic regression model to do a multi-class classification (4 classes). I want to look at the logistic regression coefficients to see the importance of different features. I got model output from a software that looks like:
Coefficients... Class Variable other price image ====================================================================================== titleInAttr -3.5443 7.5539 -15.8454 location 929.1475 1900.9971 1040.68 inList -13.2383 -10.5824 -12.7287 imgprop 8.9593 22.5193 13.9187 priceInAttr 1.1979 34.0779 -25.0851
Here, only 3 classes are shown, so I wonder how to get the coefficients for the fourth class? Is it usually unnecessary to show coefficients for all classes? I'd like to know how to calculate the missing ones from the results. Thanks a lot.