The User specified degrees of freedom checkbox available on the Contrasts, Estimates, and Least Squares Means tabs, allows control of the denominator degrees of freedom in the F approximation. The numerator degrees of freedom is always calculated as rank(L). If the checkbox is not selected, then the default denominator degrees of freedom will be used. The default calculation method of the degrees of freedom is controlled on the General Options tab and is initially set to Satterthwaite.
Note: For a purely fixed effects model, Satterthwaite and residual degrees of freedom yield the same number. For details of the Satterthwaite approximation, see the “Satterthwaite approximation for degrees of freedom” section.
To override the default degrees of freedom, select the checkbox and type an appropriate number in the field. The degrees of freedom must greater than zero.
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