how do you calculate lmm slope does lmm need to add random slope how do you know lmm model has to add random intercept and slope how do you know lmm model needs random intercept which model does the random intercept and slope model need? how to test if the lmm model is random how do you know if the lmm model has to add random slope with random intercept how do you know when a regression model has a random intercept and a slope? which model is used to show random intercepts and slope what is the graph in r how to plot a random intercept in llm what is the function of a random slope in r what is a random intercept in lmm what does lmm use to add random slope why is it called a graph when to use random intercept or randomly slope what is the graph for random intercept in r how to use random intercept in r how do we know if random intercept is added to lmm model how to plot random intercept model in r