Chapter 7

Performing Simple Logistic Regression

Using the Fit Y by X or Logistic Platform

The Logistic platform fits the probabilities for response categories to a continuous x predictor. The fitted model estimates probabilities for each x value. The Logistic platform is the nominal or ordinal by continuous personality of the Fit Y by X platform. There is a distinction between nominal and ordinal responses on this platform:

• Nominal logistic regression estimates a set of curves to partition the probability among the responses.

• Ordinal logistic regression models the probability of being less than or equal to a given response. This has the effect of estimating a single logistic curve, which is shifted horizontally to produce probabilities ...

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