READABILITY
(1) Flesch-Kincaid
Reading Ease
The Flesch-Kincaid Reading Ease index predicts how easy/difficult the text will be for
others to read based on average sentence length and word length. The index values range
from zero (0) to one-hundred (100), zero being most difficult and one-hundred least
difficult. The index maps into grade levels also as follows:
90-100 Very Easy (4th Grade)
80-89 Easy (5th Grade)
70-79 Fairly Easy (6th Grade)
60-69 Standard (7th-8th Grade)
50-59 Fairly Hard (Some High School)
40-49 Difficult (High School - College)
30-39 Very Difficult (College and Beyond)
(2) Flesch Grade Level
The Flesch-Kincaid Grade Level is an index intended to represent the level of
linguistic maturity reflected in the text. The inputs to its formula are sentence and word
lengths. The index is reported as a standard grade level.
(3) Gunning Fog Index
Gunning's Fog index uses average sentence length and big words (the number of words
containing four syllables or more) as a measure of reading difficulty. Low numbers, say,
below ten (10), signify the use of simple vocabulary, while higher numbers, e.g., in the
twenties, signal the presence of verbose text.
SYNTACTIC FLUENCY
The flags reported relate to the so-called terminal unit [T_Unit]. Terminal
units are constructions in the text capable of standing as independent sentences in their
own right. There are five flags in this class, plus a composite index derived from two of
the flag values:
[WT=Value] -- Mean words per T_Unit
[WC=Value] -- Mean words per clause
[WS=Value] -- Mean words per sentence
[CT=Value] -- Mean clauses per T_Unit
[TS=Value] -- Mean T_Units per sentence
T_Unit Composite = TS*WT
Each of these flags contains a number relating to the syntactic complexity of
sentences. The composite index ranges from around ten (least complex) to above twenty
(most complex).
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