Parameters | Expression Parameters | Kenward-Roger Degrees of Freedom Method

Kenward-Roger Degrees of Freedom Method
Check this option to use the Kenward-Roger method for computing denominator degrees of freedom for all hypothesis tests.
This method often provides more accurate tests for unbalanced experimental designs.
Caution: This method can be considerably more computationally intensive.
To Specify This Option:
*
Refer to the SAS documentation for PROC MIXED for more information.