what is the difference between a normal and marginal mixed model? what is the difference between a marginal and a mixed model? why use mixed model when does a mixed model have to be based only on normal or population which of the following is a mixed model of interest? if interest is only in the population do i use a linear mixed model how is the variable population used in a linear mixed model can i use a mixed model when only in population? what is meant by linear mixed models what is marginal variable why should we use a mixed model instead of the normal model which model is better for interest only and normal which is better to use a marginal or a mixed model? what is marginal mixed model and why is it useful? what kind of model is mixed or normal what is the difference of a mixed and marginal linear model what does mixed model mean how does a mixed model work why use a mixed model? what is the purpose of mixed model