fold_enrichment: Fold enrichment (observed / expected ratio)

In vennDiagramLab: Headless Venn Diagram Analysis and Rendering

Fold enrichment (observed / expected ratio)

Description

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)

vennDiagramLab documentation built on May 19, 2026, 1:07 a.m.