The GLMMOD Procedure

PROC GLMMOD Statement

PROC GLMMOD <options> ;

The PROC GLMMOD statement invokes the GLMMOD procedure. Table 43.1 summarizes the options available in the PROC GLMMOD statement.

Table 43.1: PROC GLMMOD Statement Options

Statement	Description
DATA=	Specifies the SAS data set to be used
NAMELEN=	Specifies the maximum length for an effect name
NOPRINT	Suppresses the normal display of results
OUTPARM=	Names an output data set describing the design matrix columns
OUTDESIGN=	Names an output data set to contain the columns of the design matrix
PREFIX=	Specifies a prefix to use in naming the columns of the design matrix
ZEROBASED	Modifies the numbering for the columns of the design matrix

It has the following options:

DATA=SAS-data-set

specifies the SAS data set to be used by the GLMMOD procedure. If you do not specify the DATA= option, the most recently created SAS data set is used.

NAMELEN=n

specifies the maximum length for an effect name. Effect names are listed in the table of parameter definitions and stored in the EFFNAME variable in the OUTPARM= data set. By default, n = 20. You can specify $20 < n \leq 200$ if 20 characters are not enough to distinguish between effects, which might be the case if the model includes a high-order interaction between variables with relatively long, similar names.

NOPRINT

suppresses the normal display of results. This option is generally useful only when one or more output data sets are being produced by the GLMMOD procedure. Note that this option temporarily disables the Output Delivery System (ODS); see Chapter 20: Using the Output Delivery System, for more information.

ORDER=DATA | FORMATTED | FREQ | INTERNAL

specifies the sort order for the levels of the classification variables (which are specified in the CLASS statement). This option applies to the levels for all classification variables, except when you use the (default) ORDER=FORMATTED option with numeric classification variables that have no explicit format. With this option, the levels of such variables are ordered by their internal value.

The ORDER= option can take the following values:

Value of ORDER=	Levels Sorted By
DATA	Order of appearance in the input data set
FORMATTED	External formatted value, except for numeric variables with no explicit format, which are sorted by their unformatted (internal) value
FREQ	Descending frequency count; levels with the most observations come first in the order
INTERNAL	Unformatted value

By default, ORDER=FORMATTED. For ORDER=FORMATTED and ORDER=INTERNAL, the sort order is machine-dependent. For more information about sort order, see the chapter on the SORT procedure in the Base SAS Procedures Guide and the discussion of BY-group processing in SAS Language Reference: Concepts.

OUTPARM=SAS-data-set

names an output data set to contain the information regarding the association between model effects and design matrix columns.

OUTDESIGN=SAS-data-set

names an output data set to contain the columns of the design matrix.

PREFIX=name

specifies a prefix to use in naming the columns of the design matrix in the OUTDESIGN= data set. The default prefix is Col and the column name is formed by appending the column number to the prefix, so that by default the columns are named Col1, Col2, and so on. If you specify the ZEROBASED option, the column numbering starts at zero, so that with the default value of PREFIX= the columns of the design matrix in the OUTDESIGN= data set are named Col0, Col1, and so on.

ZEROBASED

specifies that the numbering for the columns of the design matrix in the OUTDESIGN= data set begin at 0. By default it begins at 1, so that with the default value of PREFIX= the columns of the design matrix in the OUTDESIGN= data set are named Col1, Col2, and so on. If you use the ZEROBASED option, the column names are instead Col0, Col1, and so on.