logit function

What is a Logit Function and Why Use Logistic Regression?

May 11th, 2015 by

One of the big assumptions of linear models is that the residuals are normally distributed.  This doesn’t mean that Y, the response variable, has to also be normally distributed, but it does have to be continuous, unbounded and measured on an interval or ratio scale.

Unfortunately, categorical response variables are none of these. (more…)