{"action":"opened","issue":{"url":"https://api.github.com/repos/Yoast/YoastSEO.js/issues/267","repository_url":"https://api.github.com/repos/Yoast/YoastSEO.js","labels_url":"https://api.github.com/repos/Yoast/YoastSEO.js/issues/267/labels{/name}","comments_url":"https://api.github.com/repos/Yoast/YoastSEO.js/issues/267/comments","events_url":"https://api.github.com/repos/Yoast/YoastSEO.js/issues/267/events","html_url":"https://github.com/Yoast/YoastSEO.js/issues/267","id":132433796,"number":267,"title":"Flesch reading ease test l10n","user":{"login":"omarreiss","id":1488816,"avatar_url":"https://avatars.githubusercontent.com/u/1488816?v=3","gravatar_id":"","url":"https://api.github.com/users/omarreiss","html_url":"https://github.com/omarreiss","followers_url":"https://api.github.com/users/omarreiss/followers","following_url":"https://api.github.com/users/omarreiss/following{/other_user}","gists_url":"https://api.github.com/users/omarreiss/gists{/gist_id}","starred_url":"https://api.github.com/users/omarreiss/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/omarreiss/subscriptions","organizations_url":"https://api.github.com/users/omarreiss/orgs","repos_url":"https://api.github.com/users/omarreiss/repos","events_url":"https://api.github.com/users/omarreiss/events{/privacy}","received_events_url":"https://api.github.com/users/omarreiss/received_events","type":"User","site_admin":false},"labels":[{"url":"https://api.github.com/repos/Yoast/YoastSEO.js/labels/enhancement","name":"enhancement","color":"84b6eb"},{"url":"https://api.github.com/repos/Yoast/YoastSEO.js/labels/requirements-analysis","name":"requirements-analysis","color":"84b6eb"}],"state":"open","locked":false,"assignee":null,"milestone":null,"comments":0,"created_at":"2016-02-09T14:31:40Z","updated_at":"2016-02-09T14:31:40Z","closed_at":null,"body":"Irene, our language scientist has made a little breakdown of the Flesch reading ease test. Below you find Flesch reading formula's for 7 different languages. We could consider adding separate config for each one of those and include the Flesch reading ease test for those languages.\r\n\r\nRelated: #179\r\n\r\n### Formula (per language)\r\n\r\n- FLE (English) = 206.835 - 1.015( <sup>total words</sup>/<sub>total sentences</sub> ) - 84.6( <sup>total syllables</sup>/<sub>total words</sub> ).\r\n\r\n<sub>(Flesch, R. (1948). A new readability yardstick. Journal of applied psychology,32(3), 221.)</sub>\r\n\r\n- FLE(German) = 180 - ( <sup>total words</sup>/<sub>total sentences</sub> ) - 58.5( <sup>total syllables</sup>/<sub>total words</sub> ). \r\n- FLE(Spanish) = 206.84 - 0.60( _syllables_ in 100 words ) - 1.02 ( <sup>total words</sup>/<sub>total sentences</sub> ).\r\n- FLE(Italian) = 217 - 1.3( <sup>total words</sup>/<sub>total sentences</sub> ) - 0.6( _syllables_ in 100 words ).\r\n- FLE(French) = 207 - 1.015( <sup>total words</sup>/<sub>total sentences</sub> ) - 73.6( <sup>total syllables</sup>/<sub>total words</sub> ).\r\n- FLE(Russian) = 206.835 - 1.3( <sup>total words</sup>/<sub>total sentences</sub> ) - 60.1( <sup>total syllables</sup>/<sub>total words</sub> ).\r\n- FLE(Dutch) = 206.84 - 0.77( <sup>total words</sup>/<sub>total sentences</sub> ) - 0.93( <sup>total syllables</sup>/<sub>total words</sub> ).\r\n\r\n<sub>\r\n(Amstad, T. (1978). Wie verständlich sind unsere Zeitungen?. Studenten-Schreib-Service.\r\nGarais, E. G. (2011). Web Applications Readability. Journal of Information Systems & Operations Management, 5(1), 114-120.)\r\nУстинова, Л. В., & Фазылова, Л. С. (2014). Автоматизация оценки сложности учебных текстов на основе статистических параметров.ХАБАРШЫСЫ ВЕСТНИК, 96.\r\nOborneva, I. V. (2005): Mathematical model for evaluation of didactic texts.. Proc. of Moscow State Pedag. Univ., series ‘Informatics’, Vol. 4, No. 1, pp. 141–147\r\nhttps://nl.wikipedia.org/wiki/Leesbaarheid)\r\n</sub>\r\n\r\n### Scale\r\n\r\n| Score | Interpretation | Estimated Reading Grade |\r\n|----------|:-------------:|------:|\r\n| 90 to 100 | Very easy | 5th grade |\r\n| 80 to 90 | Easy | 6th grade |\r\n| 70 to 80  | Fairly easy | 7th grade |\r\n| 60 to 70 | Standard | 8th and 9th grade |\r\n| 50 to 60 | Fairly difficult | 10th to 12th grade (high school) |\r\n| 30 to 50 | Difficult | College |\r\n|0 to 30  | Very difficult | College graduate |\r\n\r\n<sub>http://www.mang.canterbury.ac.nz/writing_guide/writing/flesch.shtml </sub>\r\n\r\n### Background\r\n\r\n- Measurement of word length is indirectly a measurement of word complexity (r = .87)\r\n- Word complexity is in turn indirectly a measurement of abstraction; the correlation between the number of affixes and that of abstract words is .78.\r\n- The measurement of sentence length is indirectly a measurement of sentence complexity. In two independent studies the correlation between these two factors was found to be .775 and .72. \r\n- Sentence complexity, in turn, may again be considered as a measure of abstraction (no statistical evidence by Flesch!). The formula therefore is essentially a test of the level of abstraction.\r\n\r\n<sub>(Flesch, R. (1948). A new readability yardstick. Journal of applied psychology,32(3), 221.)</sub>\r\n\r\n\r\n- “There is no such thing as a valid readability formula. Readability is generally taken to mean that quality of written material which induces a reader to go on reading. Readability formulas (...) do not predict readability. Those formulas which have been adequately validated actually predict comprehensibility. Obviously, anyone who wants to go on reading certain material must be able to understand it. On the other hand, the fact that certain material is comprehensible to a certain person by no means guarantees that he will find it readable.”\r\n\r\n<sub>(McLaughlin, G.H. (1974). Temptations of the Flesch. Instructional Science, 2, 367-384.)</sub>\r\n"}}