Bysort Stata Egen. Jan 06 2019 bysort month. For example the data has three variables id time and y we want to compute the mean of y by for each id and then store it as a new variable mean_y.
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Consider the dataset shown in the figure below Table 1. 2002 bysort year month egen Z total xweight else bysort year month. Stata cmd bysort varlist 1 varlist 2 rc0.
One of Statas most powerful and useful commands is egen.
One of Statas most powerful and useful commands is egen. In Stata if the group aggregations need to be used with the original data set one would usually use bysort with egen. List stockid year if return maxreturn. For example to subtract the mean for each observation by smoker group.
