Coleman-Liau Index
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The Coleman-Liau Index is a readability test designed by Meri Coleman and T. L. Liau to gauge the understandability of a text. Like the Flesch-Kincaid Grade Level, Gunning-Fog Index, SMOG Index, and Automated Readability Index, its output approximates the U.S. grade level thought necessary to comprehend the text.
Like the ARI but unlike most of the other indices, Coleman-Liau relies on characters instead of syllables per word. Although opinion varies on its accuracy as compared to the syllable/word and complex word indices, characters are more readily and accurately counted by computer programs than are syllables.
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[edit] Formula
To calculate the Coleman-Liau:
- Divide the number of characters by the number of words, and multiply by 5.89. Call this A.
- Take the number of sentences in a fragment of 100 words, and multiply by 0.3. Call this B.
- Subtract B from A and subtract 15.8
Expressed as a formula, this is:
(5.89 * characters/words) − (30 * sentences/words) − 15.8
[edit] References
- Coleman, M.; and Liau, T. L. (1975); A computer readability formula designed for machine scoring, Journal of Applied Psychology, Vol. 60, pp. 283-284
[edit] External links
- Online readability tests - finds Coleman-Liau and other indices, suggestions how to improve readability
[edit] See also
- Automated Readability Index
- Bormuth index
- Coke-Rothkopf index
- Dale-Chall index
- Flesch-Kincaid Readability Test
- Gunning fog index
- Readability
- SMOG Index
- Zipf law
