Alphabetic Content Ratio of Text — content

The fraction of a string's non-space characters that are letters. A domain-agnostic measure of how much of a unit is prose rather than numbers, punctuation, or symbols: real sentences score near 1, while citation fragments, reference lists, number tables, and identifiers (`"OJ No L 297, 24.11.1979, p. 1."`, `"doi:10.1007/..."`) score low. Used by the `min_content` filters of [segment()] and [topics()].

Usage

content_ratio(text)

Arguments

text: A character vector.

Value

A numeric vector in `[0, 1]`; empty or space-only elements score `0`.

Examples

content_ratio(c("A real sentence here.", "OJ No L 297, 24.11.1979, p. 1."))
#> [1] 0.9444444 0.2500000