Computes (k * N) / (K * n). Returns 0.0 if any denominator is zero
(matches web tool convention).
Usage
fold_enrichment(N, K, n, k)
Arguments
- N
Population size (total items in the universe). Integer >= 1.
- K
Number of success states in the population (e.g. inclusive |A|). Integer >= 0.
- n
Number of draws (e.g. inclusive |B|). Integer >= 0.
- k
Observed successes (e.g. |A intersection B|). Integer >= 0.
Value
Numeric (>= 0; can exceed 1 for over-representation).
Examples
fold_enrichment(20000, 138, 581, 126)
#> [1] 31.43007