what is the fit test used for how is the fit of two polytomous items what is the best measure of good fit? what is the fit factor in a polytomous set of items how many categories in a fit scale what is the fitness of the polytomous set which scale is better for accuracy of fit or nested average fit for polytomous sets which category is best for good fit test how to compare nested items does a grammatical scale have a more fit scale with 7 categories how many criteria are used for comparing quality of fit what is the quality of fit of a polytomous set of items how do you test fit does polytomous credit scale have more than 7 categories what's the gps scale what is the best size of a set of items to fit on a scale what is the fit for a polytomous set of items which measure of quality is better fit for two sets of items? what is the average fit of a polytomy item