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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 $$ deff = \sqrt n \sum_j w_j^2 / (\sum_j w_j)^2$$

Author

Alexander Kowarik

Examples

kishFactor(rep(1,10))
#> [1] 1
kishFactor(rlnorm(10))
#> [1] 1.344302