Flesch Kincaid Readability Tests

The Flesch Kindaid Readabiltity Tests are a pair of simple metrics which roughly estimate the ease with which a reader can comprehend a given text.

The plot below contains two histograms summarizing the US grade level required to read the text as estimated using the Flesh Kincaid Grade Level score. The distributions are drawn from a common list of 1000 pages in English language Wikipedia and Simple English language Wikipedia.