Compute poverty severity for Lorenz Quadratic fit

Usage

gd_compute_pov_severity_lq(
  mean,
  povline,
  headcount,
  pov_gap,
  A,
  B,
  C,
  key_values
)

mean: numeric: Welfare mean.
povline: numeric: Poverty line.
headcount: numeric: Headcount index. Allows for vector.
pov_gap: numeric: Poverty gap.
A: numeric: Lorenz curve coefficient. Output of regres_lq()$coef[1].
B: numeric: Lorenz curve coefficient. Output of regres_lq()$coef[2].
C: numeric: Lorenz curve coefficient. Output of regres_lq()$coef[3].
key_values: named list: key values for lq fit, calculated using A, B, C parameters using gd_lq_key_values

numeric