how many observations are in this data set based on weight how to estimate clustering what are the characteristics of a child obesity can obesity be clustered is obesity a fixed or multi-level data set why do we cluster and predict obesity in school how to cluster data for obesity clustering of data in school vs school what is the model of clustered and fixed effect data for obesity can a multilevel cluster be used to estimate an fe effect model? what is multi level clustering of school data why use multilevel clustering of observations which type of data is clustered across countries clustered data and fixed effects model clustered data how does child obesity relate to school clustering and multilevel data clustered effects what type of data are used for child obesity what variables are clustered how to estimate a fixed effect model