Bysort Stata. N basically indexes observations rows. Check first that egendoesn t already have what you want.
Most stata commands allow the byprefix which repeats the command for each group of observations for which the values of the variables in varlist are the same. Byscan be used with explicit subscriptingto create new variables in all kinds of useful way. Further in the latest versions of stata we can combine sort and by into a single statement.
Gen ea tag1 n 1.
One observation in each ea. Sort by bysort egen sort order. Command you need to first sort var beforw uaing the by however it is possible to the by and the sort into a single command. If there are 2 variables var1 and var2 after sort stata will sort the observations according to var1 first.
