time fixed effects swamy model time fixed effect what is swamy random coefficient used for swamy model time fixed random coefficient swamy swamy random coefficients random coefficient model time fixed effect random coefficients and time fixed effects what is swamy random coefficient model how to use random coefficient model when to use swamy random coefficient model what model used to predict time fixed effect when you use random coefficient model the time fixed effect is ____________. does swamy model of random coefficients have time fixed effect does swamy random coefficient model work why do we use swamy model random coefficient model what is random coefficient used for when can swamy random coefficient be used to find a fixed time effect? what model uses random coefficients