http://gunning-fog-index.com/index.html
Citez de pe Wikipedia:
In linguistics, the Gunning fog index is a readability test for English writing. The index estimates the years of formal education a person needs to understand the text on the first reading. For instance, a fog index of 12 requires the reading level of a United States high school senior (around 18 years old). The test was developed in 1952 by Robert Gunning, an American businessman who had been involved in newspaper and textbook publishing.
| Fog Index | Reading level by grade |
|---|---|
| 17 | College graduate |
| 16 | College senior |
| 15 | College junior |
| 14 | College sophomore |
| 13 | College freshman |
| 12 | High school senior |
| 11 | High school junior |
| 10 | High school sophomore |
| 9 | High school freshman |
| 8 | Eighth grade |
| 7 | Seventh grade |
| 6 | Sixth grade |
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.
În limba română ar fi indexul de încețoșare.
În explicațiile de pe site se zice că se calculează ca o medie ponderată a numărului de cuvinte pe propoziție și a numărului de cuvinte lungi pe cuvânt.
O interpretare ar fi aceea că că textul poate fi înțeles de către cineva care are atâția ani de școală cât indicele.

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