# SMOG

## Redirected from SMOG (Simple Measure Of Gobbledygook)

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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.^{[1]}
^{[2]} 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.^{[3]}

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^{[4]} lacks statistical validity.

## FormulasEdit

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
- Readability test

## ReferencesEdit

- ↑ 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.

## External links Edit

- 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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