how to do contrasts in r if you have no cells why do factorial studies have two or more cells? what kind of anova is used in a factorial experiment? why is the factorial data lacking how to create contrasts how to do contrasts in r how to do contrasts in r what are the contrasts in r what type of factorial is missing cells in r how to analyze factorial data what do you call the missing cell in factorial how do you make contrasts in r how to make contrasts do you use contrasts what is contrasts what is factorial in r which statement to use in factorials why are contrasts needed in factorial factorial with missing cells why does r use contrast