Compute the design effect due to unequal weighting.
Usage
kishFactor(w, na.rm = FALSE)
Arguments
- w
a numeric vector with weights
- na.rm
a logical value indicating whether NA values should be stripped before the computation proceeds.
Value
The function will return the the kish factor
Details
The factor is computed acording to 'Weighting for Unequal P_i', Leslie Kish, Journal of Official Statistics, Vol. 8. No. 2, 1992
$$ deff = \sqrt n \sum_j w_j^2 / (\sum_j w_j)^2$$
Examples
kishFactor(rep(1,10))
#> [1] 1
kishFactor(rlnorm(10))
#> [1] 1.242763
