how many levels for random effect how many levels of a subject factor for random effect can you use subject id as random effect how many levels of random variables is a mixed effect does random effect include repeat variable why is it bad to use random effect factor how many factors of random effects are there why does random effects take so much effort? can random effect be used with multiple subjects can random effect be a fixed or variable can you use subject id as a random effect how many random effects factor levels to use for random effect can random effect variables be used in a mixed model can i use subject id as a variable can random effects factor be used in mixed model experiment how many random variables can be used how many levels can an effect factor be used for can random effects be included in multiple measures how many levels of the random effects factor are needed to fit a mixed model can random effects be used in mixed model