Classification of mathematical problems as linear and nonlinear is like classification of the Universe as bananas and non-bananas.
In previous chapters, we have modeled dependent variables that are continuous in nature and can be expected to have at least some linear component in the way the x variable(s) contributes to that response. But what if those two conditions are not applicable? There are many times in biology where the response of interest is not continuous or is not linear.
Consider the data in Figure 14.1.
Figure 14.1: Parkinson’s Disease Data
The data ...