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dale-chall-formula
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Formula to detect the grade level of text according to the (revised) Dale–Chall readability formula.
This package exposes an algorithm to detect ease of reading of English texts.
You’re probably dealing with natural language, and know you need this, if you’re here!
See dale-chall
for a list of words which count as “familiar”.
All other words are considered “difficult” for this algorithm.
This package is ESM only. In Node.js (version 14.14+, 16.0+), install with npm:
npm install dale-chall-formula
In Deno with esm.sh
:
import {daleChallFormula, daleChallGradeLevel} from 'https://esm.sh/dale-chall-formula@2'
In browsers with esm.sh
:
<script type="module">
import {daleChallFormula, daleChallGradeLevel} from 'https://esm.sh/dale-chall-formula@2?bundle'
</script>
import {daleChallFormula, daleChallGradeLevel} from 'dale-chall-formula'
daleChallFormula({word: 30, sentence: 2, difficultWord: 6}) // => 4.41208
daleChallGradeLevel(daleChallFormula({word: 30, sentence: 2, difficultWord: 6})) // => [9, 10]
This package exports the identifiers daleChallFormula
, daleChallGradeLevel
.
There is no default export.
daleChallFormula(counts)
Given the number of words (word
), the number of sentences (sentence
), and
the number of unique unfamiliar words in a document (difficultWord
), returns
the score associated with the document.
counts
Counts from input document.
counts.sentence
Number of sentences (number
, required).
counts.word
Number of words (number
, required).
counts.difficultWord
Number of unique unfamiliar words (number
, default: 0
).
Score representing ease of reading (number
).
Pass it to daleChallGradeLevel
to get grade levels.
daleChallGradeLevel(score)
Turn a dale–chall score into U.S. grade levels.
score
Score representing ease of reading.
Grade levels ([number, number]
).
Score | Corresponding grade level | Return value |
---|---|---|
Less than 5 | Grade 4 and lower | [0, 4] |
Less than 6 | Grades 5 and 6 | [5, 6] |
Less than 7 | Grades 7 and 8 | [7, 8] |
Less than 8 | Grades 9 and 10 | [9, 10] |
Less than 9 | Grades 11 and 12 | [11, 12] |
Less than 10 | Grades 13 and 15 (College) | [13, 15] |
Higher | Grades 16 and higher (College Graduate) | [16, Infinity] |
This package is fully typed with TypeScript.
It exports the additional type Counts
.
This package is at least compatible with all maintained versions of Node.js. As of now, that is Node.js 14.14+ and 16.0+. It also works in Deno and modern browsers.
automated-readability
— uses character count instead of error-prone syllable parsercoleman-liau
— uses letter count instead of an error-prone syllable parserflesch
— uses syllable countflesch-kincaid
— like flesch-formula
, returns U.S. grade levelsgunning-fog
— uses syllable count, needs POS-tagging and NERsmog-formula
— like gunning-fog-index
, without needing advanced NLPspache-formula
— uses a dictionary, suited for lower reading levelsYes please! See How to Contribute to Open Source.
This package is safe.
FAQs
Formula to detect the grade level of text according to the (revised) Dale-Chall Readability Formula (1995)
The npm package dale-chall-formula receives a total of 1,088 weekly downloads. As such, dale-chall-formula popularity was classified as popular.
We found that dale-chall-formula demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 2 open source maintainers collaborating on the project.
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Research
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