• Source: Lix (readability test)

LIX (abbreviation of Swedish läsbarhetsindex, "readibility index") 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.





LIX

=

average sentence length

+

percentage of words of more than six letters



{\displaystyle {\text{LIX}}={\text{average sentence length}}+{\text{percentage of words of more than six letters}}}


Scores usually range from 20 ("very easy") to 60 ("very difficult").

The exact formula is:





LIX

=


A
B


+



C
⋅
100

A




{\displaystyle {\text{LIX}}={\frac {A}{B}}+{\frac {C\cdot 100}{A}}}

, where




A


{\displaystyle A}

is the number of words,




B


{\displaystyle B}

is the number of periods (defined by period, colon or capital first letter), and




C


{\displaystyle C}

is the number of long words (more than 6 letters).




References






Further reading


Björnsson, C. H. (1968). Läsbarhet. Stockholm: Liber.
Björnsson, C. H. (1971). Læsbarhed. København: Gad.




External links


Detailed LIX calculator (in Swedish)

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