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SMOG (Simple Measure of Gobbledygook) is a readability formula that estimates the years of education needed to completely understand a piece of writing. SMOG is widely used, particularly for checking health messages.  The SMOG formula yields a 0.985 correlation with a standard error of 1.5159 grades with the grades of readers who had 100% comprehension of test materials.
SMOG was published by G. Harry McLaughlin in 1969 as a more accurate and more easily calculated substitute for the Gunning-Fog Index. To make calculating a text's readability as simple as possible an approximate formula was also given — count the words of three or more syllables in three 10-sentence samples, estimate the count's square root (from the nearest perfect square), and add 3.
Applying SMOG to other languages lacks statistical validity.
To calculate SMOG
- Count a number of sentences (at least: 10 from the start of a text, 10 from the middle, and 10 from the end).
- In those sentences, count the polysyllables (words of 3 or more syllables).
- Calculate using
A version is also given which is more easily used for mental math and is sometimes known as the SMOG Index:
- Count the number of polysyllabic words, excluding proper nouns, in a sample of thirty sentences.
- Take the square root of the nearest perfect square
- Add 3
See also Edit
- Automated Readability Index
- Coleman-Liau Index
- Flesch index
- Flesch-Kincaid index
- Flesch-Kincaid Readability Test
- Fry Readability Formula
- Gunning-Fog Index
- Flesch-Kincaid index
- Raygor Estimate Graph
- Readability test
- ↑ Hedman, Amy S. (January 2008). Using the SMOG formula to revise a health-related document. American Journal of Health Education 39 (1): 61-64.
- ↑ Ley, P., T. Florio (February 1996). The use of readability formulas in health care. Psychology, Health & Medicine 1 (1): 7–28.
- ↑ McLaughlin, G. Harry (May 1969). SMOG Grading — a New Readability Formula. Journal of Reading 12 (8): 639–646.
- ↑ Contreras, A., Garcia-alonso, R.; Echenique, M.; Daye-contreras, F. (1999). The SOL Formulas for Converting SMOG Readability Scores Between Health Education Materials Written in Spanish, English, and French. Journal of Health Communication 4 (1): 21–29.
- SMOG calculator from the formula's author
- Readability Test Tool - Test all or part of a webpage by web address or referer
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