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Calculates the effective sample size given survey weights.

Usage

calc_eff_n(weights)

Arguments

weights

Numeric vector of survey weights.

Value

Effective sample size (scalar).

Examples

w <- c(1, 2, 1.5, 3, 2)
calc_eff_n(w)  # Should be less than length(w)
#> [1] 4.45679