why use multilevel analysis why use multilevel model why use multi level regression what is the purpose of multilevel data analysis what would be considered a multilevel analysis? why use multilevel what is the main difference between simple linear regression and multilevel analysis? why? which model is most useful when a data set is clustered? what is difference between simple linear regression and multilevel analysis why use multi level model when to use multilevel modelling why use multilevel analysis when should multilevel modeling be used why use multilevel analysis what is the main focus of research on clustered data what is the statistical difference between a single linear regression model and a multilevel model? when to use multilevel analysis what kind of statistical model is used for multidimensional data difference between multilevel and linear regression can single level regression be used for multiscale data