Additional PROC MIXED Statements

Enter SAS PROC MIXED statements in this field to supplement those generated by preceding parameters.

You can specify any PROC MIXED statement except for the PROC, BY, or RUN statements. This specification provides you with maximum flexibility to fit various models.

Possible additional statements include WHERE and LSMEANS. A WHERE statement is useful for processing a subset of the data. Note that a Uniform(0,1) dummy response y variable is used, so statistical tests in the SAS Output are not meaningful. However, you can use a statement such as where response lt 0.5; to use a random subset of the input experimental design data set to reduce its sample size and hence power.

PROC MIXED statements are written in the following syntax:

Statement var1...varn;

where:

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Statement is the PROC MIXED statement,

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var1...varn are the variables (or specific values) specified,

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italicized items indicate a variable, or option to be specified,

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items within the angle brackets are optional,

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each element in the statement is delimited by a space,

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the statement ends with a semicolon (;), and

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each PROC MIXED statement is written on a separate line in the field.

Note: Variables specified here can come from either the adsl.sas7bdat or ae.sas7bdat data sets.

Examples of commonly used PROC MIXED statements are listed in the following table.

Statement	Definition	Syntax
CLASS	names the classification variables to be used in the model.	CLASS var1...varn;
MODEL	names a single dependent variable and the fixed effects that determine the X matrix of the model	MODEL dependent = <fixed effects>;
RANDOM	used to specify one or more variables classification or continuous random coefficients	RANDOM random effects;
LSMEANS	computes the least square means for the fixed effects	LSMEANS fixed effects;
REPEATED	specifies the R matrix in the model	REPEATED <repeated effect>;
ESTIMATE	constructs custom scalar estimates for confidence limits	ESTIMATE ‘label’<fixed effect values> <|random effect values>;

To Specify One or More Additional PROC MIXED Statements:

8

Type specific PROC MIXED statements in the Additional PROC MIXED Statements field.

For Additional Information

Refer to the SAS documentation for PROC MIXED for more information.