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.

$\text = \text + \text$

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

The exact formula is:

$\text = \frac + \frac{A}$, where

$A$ is the number of words,

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

$C$ 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)

Readability tests