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| {{external links|date=August 2011}}
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| In [[linguistics]], the '''Gunning fog index''' measures the [[readability]] of English writing. The index estimates the years of formal education needed to understand the text on a first reading. A fog index of 12 requires the reading level of a U.S. high school senior (around 18 years old). The test was developed by Robert Gunning, an American businessman, in 1952.<ref name="plwork8">{{cite journal | last=DuBay |first=William H. |title=Judges Scold Lawyers for Bad Writing |journal=Plain Language At Work Newsletter |issue=8 |date=23 March 2004|publisher=Impact Information |url=http://www.impact-information.com/impactinfo/newsletter/plwork08.htm |accessdate=10 January 2014}}</ref>
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| The fog index is commonly used to confirm that text can be read easily by the intended audience. Texts for a wide audience generally need a fog index less than 12. Texts requiring near-universal understanding generally need an index less than 8.
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| == Calculation ==
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| The Gunning fog index is calculated with the following [[algorithm]]:<ref name=FOG>{{cite web |title=The Gunning’s Fog Index (or FOG) Readability Formula |url=http://www.readabilityformulas.com/gunning-fog-readability-formula.php |publisher=Readabilty Formulas |accessdate=10 January 2014}}</ref>
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| # Select a passage (such as one or more full paragraphs) of around 100 words. Do not omit any sentences;
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| # Determine the average sentence length. (Divide the number of words by the number of sentences.);
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| # Count the "complex" words: those with three or more syllables. Do not include proper nouns, familiar jargon, or compound words. Do not include common suffixes (such as -es, -ed, or -ing) as a syllable;
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| # Add the average sentence length and the percentage of complex words; and
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| # Multiply the result by 0.4.
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| The complete formula is:
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| :<math>
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| 0.4\left[ \left(\frac{\mbox{words}}{\mbox{sentences}}\right) + 100\left(\frac{\mbox{complex words}}{\mbox{words}}\right) \right]
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| </math>
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| While the fog index is a good sign of hard-to-read text, it has limits. Not all complex words are difficult. For example, "asparagus" is not generally thought to be a difficult word, though it has four syllables. A short word can be difficult if it is not used very often by most people.
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| Until the 1980s, the fog index was calculated differently.<ref>{{cite book |title=The Technique of Clear Writing |last=Gunning |first=Robert |publisher=McGraw-Hill |year=1952 |pages=36-37}}</ref> The original formula counted each clause as a sentence. Because the index was meant to measure clarity of expression within sentences, it assumed people saw each clause as a complete thought.
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| In the 1980s, this step was left out in counting the fog index ''for literature''. This might have been because it had to be done manually. Judith Bogert of Pennsylvania State University defended the original algorithm in 1985.<ref>{{cite journal |last=Bogert |first=Judith |title=In Defense of the Fog Index |url=http://bcq.sagepub.com/cgi/pdf_extract/48/2/9 |journal=Business Communication Quarterly |volume=48 |number=2 |pages=9-12 |year=1985 |doi=10.1177/108056998504800203}}</ref> A review of subsequent literature shows that the newer method is generally recommended.<ref>{{cite book |last=Brucker |first= Carl, ed. |title=Arkansas Tech Writing, 12th ed. English 2053: Technical Writing |url=http://www.atu.edu/worldlanguages/texts/ATW12th.pdf |date=June 2009 |page=109}}</ref>
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| Nevertheless, some continue to point out that a series of simple, short sentences does not mean that the reading is easier.<ref>Referenced in the 2 November 2006 entry [http://notorc.blogspot.com/2006_11_01_archive.html guide to readability].</ref> In some works, such as Gibbon's ''[[The History of the Decline and Fall of the Roman Empire]]'', the fog scores using the old and revised algorithms differ greatly. A sample test took a random footnote from the text: (#51: Dion, vol.l. lxxix. p. 1363. Herodian, l. v. p. 189.<!-- THIS REFERENCE NEEDS CLARIFICATION AND MOS -->) and used an automated Gunning Fog site,<ref>[http://gunning-fog-index.com/ Fog Index Calculator]</ref> first using the sentence count, and then the count of sentences plus clauses. The site gave an index of 19.2 using only sentences, and an index of 12.5 when including independent clauses. This brought down the fog index from post-graduate to high school.<ref>{{cite web |title=Clear Writing: How to Achieve and Measure Readability |publisher=Poscripts |work=The Writing Clinic |date=2006-11-02 |url=http://notorc.blogspot.com/2006/09/devils-in-details-measuring.html}}</ref>
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| ==See also==
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| * [[Flesch–Kincaid readability test]]
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| * [[Plain language]]
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| ==References==
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| {{Reflist|2}}
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| ==External links==
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| * [http://gunning-fog-index.com/ Fog Index Calculator] — a simple web page to cut-and-paste text and then calculate Fog Index
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| * [http://www.online-utility.org/english/readability_test_and_improve.jsp Online Fog Index calculator] — suggestions how to improve readability, different measurements
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| * [http://www.read-able.com Readability Test Tool] — test all or part of a webpage by web address or referrer
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| * [http://www.editcentral.com Readability calculators] — six readability statistics
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| * [http://www.logios.pl FOG-PL] — FOG index calculator for Polish
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| * [http://www.proofreadbot.com Readability Tests] — tool that calculates all readability scores (Statistics section in the report)
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| {{DEFAULTSORT:Gunning Fog Index}}
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| [[Category:Readability tests]]
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