Fill or interpolate panel gaps — complete

Completes a panel so every country has every year, optionally filling missing values by carry-forward ("locf") or linear interpolation ("linear") so animations do not flicker on missing years.

Usage

complete_years(
  data,
  years = NULL,
  value = NULL,
  method = c("none", "locf", "linear")
)

Arguments

data: A panel with iso3c and year.
years: The full set of years to complete to. Defaults to the observed min:max.
value: Optional value column(s) (character) to fill. If NULL, all numeric columns except year are filled.
method: "none" (default; just complete the grid), "locf" or "linear".

Value

A completed (and optionally filled) panel tibble – or an sf frame, if data was one; each invented row carries its country's geometry.

Examples

df <- data.frame(iso3c = "USA", year = c(2000L, 2002L), gdp = c(1, 3))
complete_years(df, 2000:2002, method = "linear")
#> # A tibble: 3 × 3
#>    year iso3c   gdp
#>   <int> <chr> <dbl>
#> 1  2000 USA       1
#> 2  2001 USA       2
#> 3  2002 USA       3