ESTIMATE ’label’ contrastspecification <(divisor=n)><, ’label’ contrastspecification <(divisor=n)>> <, …> </ options>;
The ESTIMATE statement provides a mechanism for obtaining custom hypothesis tests. As in the CONTRAST statement, the basic element of the ESTIMATE statement is the contrastspecification, which consists of MODEL and RANDOM effects and their coefficients. Specifically, a contrastspecification takes the form
< fixedeffect values …> <  randomeffect values …>
Based on the contrastspecifications in your ESTIMATE statement, PROC HPMIXED constructs the matrix , as in the CONTRAST statement, where is associated with the fixed effects and is associated with the Gside random effects.
PROC HPMIXED then produces for each row of an approximate t test of the hypothesis , where . Results from all ESTIMATE statement are combined in the "Estimates" ODS table.
Note that multirow estimates are permitted. Unlike the CONTRAST statement, you need to specify a ’label’ for every row of the multirow estimate, since PROC HPMIXED produces one test per row.
PROC HPMIXED selects the degrees of freedom to match those displayed in the "Type III Tests of Fixed Effects" table for the final effect you list in the ESTIMATE statement. You can modify the degrees of freedom by using the DF= option. If you select DDFM= NONE and do not modify the degrees of freedom by using the DF= option, PROC HPMIXED uses infinite degrees of freedom, essentially computing approximate z tests.
If PROC HPMIXED finds the fixedeffects portion of the specified estimate to be nonestimable, then it displays "Nonest" for the estimate entry.
The construction of the matrix for an ESTIMATE statement follows the same rules as listed under the CONTRAST statement.
Table 55.5 summarizes the options available in the ESTIMATE statement.
Table 55.5: ESTIMATE Statement Options
Option 
Description 

Specifies the confidence level 

Constructs ttype confidence limits 

Specifies the degrees of freedom 

Specifies values to divide the coefficients 

Displays the matrix coefficients 

Sets up randomeffect contrasts between groups 

Tunes the estimability checking 

Sets up randomeffect estimates between subjects 
You can specify the following options in the ESTIMATE statement after a slash (/).