why do we group variables in our model when to group predictor factor levels why is it bad to group a predictor why is it bad to group predictors can predictor factors be grouped how to grouped predictor factor levels what should a predictor factor be based off of how do i group predictors why is it bad to group predictor factor if predictor factor is based on response variable what would this be? which predictor level is grouped based on the response variable? quizlet why is it bad to grouped predictors why are the predictor levels not aggregated why is it bad to group predictors how to group predictor levels why is it bad to group the predictor factor levels in a linear model? if y is continuous, group predictor factor levels based on response variable why are predictor factor levels grouped? what is the correct way to group predictors why is it bad to grouped predictor level