why are panels not nested within clusters stata what is region-year statistic is the person id a cluster variable what variable is nested within cluster why do stata panels get nested where is the variable vce in stata when are clusters nested within a dataset which statistic model uses the numeric variable for a year if you use the region-year variable in stata, what is the resulting variable what is the region year in stata where are clusters not nested what is a region if no cluster what is the stata error a nested panel when a panel is not nested within clusters what is region based statistic error where are nested clusters in stata error what is n nested within cluster which region are the people in the panel in stata what is the cluster variable for the year where is the person in the cluster