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.
The sum ofsquared deviations about the regression line is a measure of the ex-tent to which the regression fails to explain the dependent variable (ameasure of the noise). Hence, the R 2 statistic is a measure of the ex-tent to which the total variation of the dependent variable is ex-plained by the regression.