Raygor readability estimate

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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.[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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* Extract a 100-word passage from the selection.[2] 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 0.5.
* Count the number of words in each passage containing six or more letters.
* Find the point on the Raygor estimate graph.

## References

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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. ^ a b Wolinski, John T.; Bozman, Maurice W. (1983). "Using the Raygor Readability Estimate for Social Studies". Social Studies. 74 (5): 215–19.

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Readability tests for English

Tests and formulas that measure the readability of a text

* Automated readability index (1967)
* ATOS
* Coleman–Liau index (1975)
* Dale–Chall readability formula (1948)
* Flesch–Kincaid readability tests
* Flesch reading ease [1975]
* Flesch–Kincaid grade level [1975]
* FORCAST (1973)
* Fry readability formula (1968)
* Gunning fog index (1952)
* Lexile (1989)
* Linsear Write
* Raygor readability estimate (1977)
* SMOG (1969)
* Spache readability formula (1952)

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