Xtset Stata Command. The storage types of both panelvar and timevar must be numeric and both variables must contain integers only. In previous versions of stata there was no xtset command.
1 unit time variable. The storage types of both panelvar and timevar must be numeric and both variables must contain integers only. The other xt commands instead had the i panelvar and t timevar options.
Year 1990 to 1999 panel variable.
Xtset country year delta. You need to do this before you can use the other xt commands. In previous versions of stata there was no xtset command. Technical note in previous versions of stata there was no xtset command.
