Title stata.com xtset — Declare data to be panel data
Statistics > Longitudinal/panel data > Setup and utilities > Declare dataset to be panel data Description xtset declares the data in memory to be a panel. You must xtset your data before you can use the other xt commands. If you save your data after xtset, the data will be remembered to be a panel and you will not have to xtset again.
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Title stata.com xtset — Declare data to be panel data
www.stata.comthe data are set with a panelvar only, the sort order is not changed. xtset, clear is a rarely used programmer’s command to declare that the data are no longer to be considered a panel. Quick start Declare dataset to be panel data with panel identifier pvar xtset pvar Indicate that observations are ordered by year, stored in tvar1 xtset pvar ...