how to determine an anova function what is the difference between satterthwaite and kenward-roger what is the difference between satterthwaite and kenward rogers approximations? what is the difference between kenward-roger and satterthwaite? which approximation is best for mixed effects difference between satterthwaite and kenward roger what is satterthwaite approximation for df in mixed effects define satterthwaite/kenward-roger what is lmertest what is satterthwaite & kenward-roger satterthwaite approximation definition what is the difference between the degrees of freedom and the degrees of freedom of kenward-roger what is satterthwaite kenward roger approximation satterthwaite approximation what is satterthwaite approximation what is the difference between kenward and satterthwaite approximation? what is lmertest what is the difference between satterthwaite and kennward difference between satterthwaite & kenward ranker what is lmertest used for