Lix (readability test)
LIX is a readability measure indicating the difficulty of reading a text developed by Swedish scholar Carl-Hugo Björnsson. It is defined as a sum of two numbers: the average sentence length and the percentage of words of more than six letters.
Scores usually range from 20 to 60.
The exact formula is:
, where
is the number of words,
is the number of periods, and
is the number of long words.