Hello everyone, I am trying to understand how the joint F value from proc mixed using lsmestimate option is being calculated. An example data, sas data test; input Y visitno subid; datalines; 7 1 1 9 1 2 8 1 3 7 2 1 8 2 2 6 2 3 ; proc mixed data=test ; class visitno subid; model y = visitno/solution outp=pred ; repeated visitno /type=un subject=subid; *contrast 'visitno' [1 1], [1 2]; lsmestimate visitno [1 1], [1 2]/joint(chisq) cl e; run; Least Squares Means Estimates
Effect Label Estimate Standard Error DF t Value Pr > |t| Alpha Lower Upper
visitno Row 1 8.0000 0.5774 2 13.86 0.0052 0.05 5.5159 10.4841
visitno Row 2 7.0000 0.5774 2 12.12 0.0067 0.05 4.5159 9.4841
F Test for Least Squares Means Estimates
Effect Num DF Den DF Chi-Square F Value Pr > ChiSq Pr > F
visitno 2 2 228.00 114.00 <.0001 0.0087
Can someone help me understand how the F Value of 114 is derived? Thank you for your help. Best, Divine
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