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| states-package | State system membership |
| cowstates | Correlates of War list of independent states |
| gwstates | Gleditsch and Ward list of independent states |
| id_date_sequence | Identify date sequences |
| missing_info | Vizualize missing and non-proper cases for state panel data |
| plot_missing | Vizualize missing and non-proper cases for state panel data |
| sfind | Lookup country codes or names |
| states | State system membership |
| state_panel | Create state panel data |