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Basic Analysis and Graphing - SAS

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Chapter 7<br />

Performing Simple Logistic Regression<br />

Using the Fit Y by X or Logistic Platform<br />

The Logistic platform fits the probabilities for response categories to a continuous x predictor. The fitted<br />

model estimates probabilities for each x value. The Logistic platform is the nominal or ordinal by continuous<br />

personality of the Fit Y by X platform. There is a distinction between nominal <strong>and</strong> ordinal responses on this<br />

platform:<br />

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

• Ordinal logistic regression models the probability of being less than or equal to a given response. This<br />

has the effect of estimating a single logistic curve, which is shifted horizontally to produce probabilities<br />

for the ordered categories. This model is less complex <strong>and</strong> is recommended for ordered responses.<br />

Figure 7.1 Examples of Logistic Regression<br />

Ordinal Logistic Regression<br />

Nominal Logistic Regression

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