Calculate Relative Index of Inequality (RII)

The RII is the SII expressed relative to the mean health level. An RII of 0.20 means the most deprived group has health 20 across the full socioeconomic range.

Usage

calc_rii(data, health_var, group_var, weight_var)

Arguments

data: A data frame with health and group columns.
health_var: Name of the health variable column (character).
group_var: Name of the socioeconomic group column (ordered integer, 1 = most deprived).
weight_var: Name of the population share column (sums to 1).

Value

A named list with elements rii, sii, se_rii, p_value, and model.

Examples

df <- tibble::tibble(
  group      = 1:5,
  mean_hale  = c(60, 63, 66, 69, 72),
  pop_share  = rep(0.2, 5)
)
calc_rii(df, "mean_hale", "group", "pop_share")
#> Warning: essentially perfect fit: summary may be unreliable
#> $sii
#> [1] 15
#> 
#> $rii
#> [1] 0.2272727
#> 
#> $se_sii
#> [1] 1.868784e-15
#> 
#> $p_value
#> [1] 4.264559e-48
#> 
#> $model
#> 
#> Call:
#> stats::lm(formula = h ~ ridit, weights = w)
#> 
#> Coefficients:
#> (Intercept)        ridit  
#>        58.5         15.0  
#> 
#> 
#> $se_rii
#> [1] 2.831491e-17
#>