You can use the Method tab to specify aspects of the generalized linear model such as the response distribution and the link function. (See Figure 24.8.)
The Method tab contains the following UI controls:
specifies the distribution of the response variable. This corresponds to the DIST= option in the MODEL statement.
specifies whether to model the probability of the first or last level of the response variable. This item is available only
when the response distribution is binomial or multinomial. This corresponds to the DESCENDING option in the PROC GENMOD statement.
specifies the link function. This corresponds to the LINK= option in the MODEL statement.
The following table specifies the default link function for each response distribution.
Table 24.1: Default Link Functions
Distribution |
Default Link Function |
---|---|
Binomial |
Logit |
Gamma |
Inverse (power(–1)) |
Inverse gaussian |
Inverse squared (power(–2)) |
Multinomial |
Cumulative logit |
Negative binomial |
Log |
Normal |
Identity |
Poisson |
Log |
When the choice of response distribution is multinomial, the choice of link functions is limited to the cumulative logit, the cumulative probit, and the cumulative complementary log-log.
specifies the number to use for a power link function. This item is available only when the link function is the power function.
specifies how to order the response variable. This corresponds to the RORDER= option in the PROC GENMOD statement.
specifies the parameterization method for the classification variables. This corresponds to the PARAM= option in the CLASS statement. The dialog box supports
the GLM, effect, and reference coding schemes.
specifies the method for estimating the dispersion parameter. This corresponds to the SCALE= option in the MODEL statement.