Loss of fat below the skin in the cheeks, temples, chin, nose, and eye area may result in loosening skin, sunken eyes, and a skeletal appearance. Bone loss, mostly around the mouth and chin, may become evident after age 60 and cause puckering of the skin around the mouth.
Logistic regression allows one to predict a discrete outcome, such as group membership, from a set of variables that may be continuous, discrete, dichotomous, or a mix of any of these. Generally, the dependent or response variable is dichotomous, such as presence/absence or success/failure.
I Diï¬erence: I Linear regression on indicator matrix: approximate. Pr(G = k |X = x) by a linear function of x. Pr(G = k |X = x) is not guaranteed to fall between 0 and 1. and to sum up to 1. I Logistic regression: Pr(G = k |X = x) is a nonlinear function. of x. It is guaranteed to range from 0 to 1 and to sum up to 1.