Make a state panel compatible with peacesciencer — as_peacesciencer

Adds the key alias and metadata expected by state-year functions from the peacesciencer package. The original cow or gw column is retained, so the result remains compatible with all contentiousR functions.

Usage

as_peacesciencer_panel(panel)

Arguments

panel: A state-year data frame containing exactly one of cow or gw and a year column.

Value

The input data frame with an additional ccode (COW) or gwcode (Gleditsch-Ward) alias and the attributes ps_system and ps_data_type = "state_year". Rows and analytical variables are not changed.

Details

peacesciencer dispatches its add_*() functions using attributes created by peacesciencer::create_stateyears(). It also expects its own key names: ccode for COW panels and gwcode for Gleditsch-Ward panels. This adapter supplies that interface without replacing contentiousR's cow or gw key.

Place the adapter immediately before the first peacesciencer function, or earlier in the pipeline. Dplyr joins used by contentiousR preserve these attributes.

Examples

panel <- build_states_panel(1990, 1995, coding_system = "cow") |>
  add_gdp() |>
  as_peacesciencer_panel()

names(panel)
#> [1] "cow"          "year"         "country"      "gdp_pcap"     "log_gdp_pcap"
#> [6] "gdp_growth"   "ccode"       
attr(panel, "ps_system")
#> [1] "cow"
attr(panel, "ps_data_type")
#> [1] "state_year"