how to simulate regression data how to generate simulation data using r what is z1 in regression? which type of regression simulation is the same as the random factor how to create a mixed model how to do a random factor regression why do you need to simulate data what is the random factor in mixed model how to simulate data for mixed model why create a mixed model how to make mixed model of regression what is random factor y r used for how do i simulate a linear equation what type of data can be added to a mixed model? what is random factor mixed model when is the random factor z1 used? what is the mixed model? how to simulate for mixed model what model would use random coefficients how to run mixed model simulations