Element-wise chain-ladder development factor triangle — create_chl_coef

For every cell (i, j) of a cumulative triangle returns cum_trg[i, j] / cum_trg[i, j-1]. The first column and the upper-right NA corner are left as NA.

Usage

create_chl_coef_triangle(cum_trg)

Arguments

cum_trg: A cumulative numeric triangle.

Value

A numeric matrix of the same shape with development factors.

Examples

cum <- matrix(c(10, 30, 32,  20, 27, NA,  15, NA, NA), nrow = 3, byrow = TRUE)
create_chl_coef_triangle(cum)
#>      [,1] [,2]     [,3]
#> [1,]   NA 3.00 1.066667
#> [2,]   NA 1.35       NA
#> [3,]   NA   NA       NA