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A rendition of the Raygor Graph.
The Raygor estimate graph is a readability metric for English text. It was developed by Alton L. Raygor, who published it in 1977.
The US 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.
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