The ESTIMATE statement is exactly like a CONTRAST statement, except only onerow matrices are permitted. The actual estimate, , is displayed along with its approximate standard error. An approximate t test that = 0 is also produced.
PROC MIXED selects the degrees of freedom to match those displayed in the "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 PROC MIXED finds the fixedeffects portion of the specified estimate to be nonestimable, then it displays "Nonest" for the estimate entries.
The following examples of ESTIMATE statements compute the mean of the first level of A
in the splitplot example (see Example 65.1) for various inference spaces:
estimate 'A1 mean narrow' intercept 1 A 1 B .5 .5 A*B .5 .5  block .25 .25 .25 .25 A*Block .25 .25 .25 .25 0 0 0 0 0 0 0 0; estimate 'A1 mean intermed' intercept 1 A 1 B .5 .5 A*B .5 .5  Block .25 .25 .25 .25; estimate 'A1 mean broad' intercept 1 A 1 B .5 .5 A*B .5 .5;
The construction of the vector for an ESTIMATE statement follows the same rules as listed under the CONTRAST statement.
Table 65.5 summarizes the options available in the ESTIMATE statement.
Table 65.5: ESTIMATE Statement Options
Option 
Description 

Specifies the confidence level 

Constructs ttype confidence limits 

Specifies the degrees of freedom 

Specifies a value by which to divide all coefficients 

Displays the matrix coefficients 

Sets up randomeffect contrasts between different groups 

Performs lowertailed tests 

Tunes the estimability checking 

Sets up randomeffect contrasts between different subjects 

Performs uppertailed tests 
You can specify the following options in the ESTIMATE statement after a slash (/).