## Analysis of Deviance for Generalized Linear Models

The **Analysis of Deviance** table for generalized linear
models, as illustrated by Figure 39.12,
includes the following:
**Source**
- indicates the source of the variation.
Sources include
**Model** for the fitted
regression and **Error** for the residual error.
**C Total** is the sum of the **Model** and **Error** components,
and it is the total variation after correcting for the mean.
When the model does not have an intercept term, the
uncorrected total variation (**U Total**) is printed.
**DF**
- is the degrees of freedom associated
with each source of variation.

**Deviance**
- is the deviance for each source of variation.
**Deviance/DF**
- is the deviance divided by its associated degrees of freedom.

When the scale parameter is a constant specified in
the method dialog, or when the response has a Poisson
or binomial distribution, the table also contains the following:

**Scaled Dev**
- is the deviance divided by the dispersion parameter.

**Pr>Scaled Dev**
- is the probability of obtaining a greater scaled deviance
statistic than that observed if the null hypothesis is true.
Under the null hypothesis, all parameters are 0
except for the intercept, and the scaled deviance
has an approximate distribution.

Copyright © 1999 by SAS Institute Inc., Cary, NC, USA. All rights reserved.