Sep 282017

The logistic function can be used to transform a credit score into a probability of default (PD). The advantages of the logistic are (i) it easy to calculate and (ii) as a cumulative distribution function (CDF) the output is, appropriately, a probability between 0 and 1.0. In this video, I show two approaches to the exponent, which itself is the negative of a product of vectors (-b*x).… Read the rest