Polity 2 from PMM

Source: R/data_documentation.R

Polity 2 Index from Polity IV. 2013. Taken from D. Pemstein, S. A. Meserve, and J. Melton. Replication data for: Democratic Compromise: A Latent Variable Analysis of Ten Measures of Regime Type. 2013. http://hdl.handle.net/1902.1/PMM. Higher values are more democratic. Use polityIV for the latest version of the Polity IV data or download_polity_annual to download the Polity 5 revision.

polity_pmm

Format

An object of class tbl_df (inherits from tbl, data.frame) with 8050 rows and 7 columns.

Source

D. Pemstein, S. A. Meserve, and J. Melton. Replication data for: Democratic Compromise: A Latent Variable Analysis of Ten Measures of Regime Type. 2013. http://hdl.handle.net/1902.1/PMM.

M. G. Marshall, T. R. Gurr, and K. Jaggers. Polity IV Project: Political Regime Characteristics and Transitions, 1800-2018. Dataset Users' Manual. Center for Systemic Peace, 2019.

Variables

pmm_country

The original country name in the PMM replication data.

year

The calendar year.

polity_pmm

Annual polity2 index, interpolating values for interruption, interregnum, and transition periods. Higher values are more democratic. Taken from Pemstein, Daniel, Stephen A. Meserve, and James Melton. 2013. "Replication data for: Democratic Compromise: A Latent Variable Analysis of Ten Measures of Regime Type." In: Harvard Dataverse. http://hdl.handle.net/1902.1/PMM. In this version the indicator only goes to 1945, and it differs from polity2 in a few cases:

#> Joining with `by = join_by(year, extended_country_name, GWn, cown,

#> in_GW_system)`

#> # A tibble: 17 x 6

#> # Groups:   pmm_country, pmm_polity [17]

#>    pmm_country         pmm_polity polity2 min_year max_year n_years

#>    <chr>                    <int>   <dbl>    <dbl>    <dbl>   <int>

#>  1 Bhutan                      -6      -5     2005     2007       3

#>  2 Czech Republic               8       9     2006     2008       3

#>  3 Czechoslovakia              -1       2     1947     1947       1

#>  4 Equatorial Guinea           -5      -6     1996     2008      13

#>  5 Ethiopia                     0       1     1993     1993       1

#>  6 Ethiopia                     1      -3     2005     2008       4

#>  7 Israel                       9       6     1981     1998      18

#>  8 Israel                      10       6     1999     2008      10

#>  9 Korea North                 -9     -10     1994     2008      15

#> 10 Lebanon                      7       6     2005     2008       4

#> 11 Moldova                      8       9     2005     2008       4

#> 12 Montenegro                   8       9     2008     2008       1

#> 13 Mozambique                   6       5     1994     2008      15

#> 14 Myanmar (Burma)             -8      -6     2008     2008       1

#> 15 Senegal                      8       7     2007     2008       2

#> 16 United States               10       8     1967     1973       7

#> 17 Yugoslavia (Serbia)          6       8     2006     2006       1

Standard descriptive variables (generated by this package)

extended_country_name

The name of the country in the Gleditsch-Ward system of states, or the official name of the entity (for non-sovereign entities and states not in the Gleditsch and Ward system of states) or else a common name for disputed cases that do not have an official name (e.g., Western Sahara, Hyderabad). The Gleditsch and Ward scheme sometimes indicates the common name of the country and (in parentheses) the name of an earlier incarnation of the state: thus, they have Germany (Prussia), Russia (Soviet Union), Madagascar (Malagasy), etc. For details, see Gleditsch, Kristian S. & Michael D. Ward. 1999. "Interstate System Membership: A Revised List of the Independent States since 1816." International Interactions 25: 393-413. The list can be found at http://privatewww.essex.ac.uk/~ksg/statelist.html.

GWn

Gleditsch and Ward's numeric country code, from the Gleditsch and Ward list of independent states.

cown

The Correlates of War numeric country code, 2016 version. This differs from Gleditsch and Ward's numeric country code in a few cases. See http://www.correlatesofwar.org/data-sets/state-system-membership for the full list.

in_GW_system

Whether the state is "in system" (that is, is independent and sovereign), according to Gleditsch and Ward, for this particular date. Matches at the end of the year; so, for example South Vietnam 1975 is FALSE because, according to Gleditsch and Ward, the country ended on April 1975 (being absorbed by North Vietnam). It is also TRUE for dates beyond 2012 for countries that did not end by then, depsite the fact that the Gleditsch and Ward list has not been updated since.