Raygor readability estimate

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A rendition of the Raygor Graph. Raygor.png
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. [1]

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. [2]

This graph is primarily used in secondary education to help classify teaching materials and books into their appropriate reading groups.

The formula

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References

  1. Baldwin, R. Scott; Kaufman, Rhonda K. (1979). "A Concurrent Validity Study of the Raygor Readability Estimate". Journal of Reading. 23 (2): 148–153. ISSN   0022-4103.
  2. 1 2 Wolinski, John T.; Bozman, Maurice W. (1983). "Using the Raygor Readability Estimate for Social Studies". Social Studies. 74 (5): 215–19.