Incremental and cumulative triangles

to_incremental() subtracts from each observed value the previous observed value of its row, so the increment after a hole covers the whole gap; to_cumulative() takes running sums of the observed increments. Each returns x unchanged if it is already in that form.

Usage

to_incremental(x)

to_cumulative(x)

Arguments

x

A triangle.

Value

A triangle.

Examples

long <- data.frame(year = c(2020, 2020, 2021), age = c(12, 24, 12), paid = c(100, 150, 110))
tri <- triangle(long, "year", "age", "paid")
to_incremental(tri)@values[1, 1, , ]
#>       development
#> origin  12 24
#>   2020 100 50
#>   2021 110 NA
to_cumulative(to_incremental(tri))@values[1, 1, , ]
#>       development
#> origin  12  24
#>   2020 100 150
#>   2021 110  NA