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The Raygor Estimate Graph is a readability metric for English text, developed by Alton L. Raygor (1977).
The U.S. grade level is calculated by the average number of sentences and letters per hundred words. These averages are plotted onto a specific graph where the intersection of the average number of sentences and the average number of letters/word determines the reading level of the content. Note that this graph is very similar to the Fry Readability Formula's graph.
This graph is primarily used in secondary education to help classify teaching materials and books into their appropriate reading groups.
- Extract a 100-word passage from the selection. If the material is long, take a subsample from the beginning, middle, and end.
- Count the number of sentences in each passage. Count a half sentence as .5.
- Count the number of words in each passage containing six or more letters.
- Find the point on the Raygor Estimate Graph.
- Readability studio - Software which supports the Raygor Estimate Graph
- Site explaining how to calculate Raygor
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