Raygor Estimate Graph
The Raygor Estimate Graph is a graphical test for English text, developed by Alton L. Raygor in 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 their intersection determines the reading level of the content. Note that this graph is very similar to the Fry graph.
This graph is primarily used in secondary education to help classify teaching materials and books into their appropriate reading groups. Below is an example of a Raygor graph as it appears in :
The Raygor Estimate Graph formula is:
- Extract a 100-word passage from the selection. If the material is long, take subsamples 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.
This test requires a 100-word sample; however, note that always analyzes your entire document to guarantee the most accurate results and does not use subsamples for any of its test calculations. If a formula requires a subsample of a specific size, then standardization is used.