spache-formula

Formula to detect the grade level of text according to the (revised) Spache readability formula.

See spache for a list of words which count as “known”.

Install

This package is ESM only: Node 12+ is needed to use it and it must be imported instead of required.

npm:

npm install spache-formula

Use

import {spacheFormula} from 'spache-formula'

spacheFormula({word: 30, sentence: 2, unfamiliarWord: 6}) // => 4.114

spacheFormula({word: 30, sentence: 2}) // => 2.474

spacheFormula() // => NaN

API

This package exports the following identifiers: spacheFormula. There is no default export.

spacheFormula(counts)

Given the number of words (word), the number of sentences (sentence), and the number of unique unfamiliar words (unfamiliarWord) in a document, returns the grade level associated with the document.

Related

• automated-readability — Uses character count instead of error-prone syllable parser
• coleman-liau — Uses letter count instead of an error-prone syllable parser
• dale-chall-formula — Uses a dictionary, suited for higher reading levels
• flesch — Uses syllable count
• flesch-kincaid — Like flesch, returns U.S. grade levels
• gunning-fog — Uses syllable count, needs POS-tagging and NER
• smog-formula — Like gunning-fog, without the need for advanced NLP tasks

License

MIT © Titus Wormer