Abstract
For some time now research has been carried out in the field of lexicometry into the statistical indices that enable lexical richness to be evaluated. The main problem lies in the fact that there should be no influence at all in the results of the formula of the length of the text in terms of the number of words it contains. Therefore, different indices have been designed, which are increasingly complex and sophisticated. This work is a review of the most important indices for calculating lexical richness, in order of complexity, looking into whether or not they are dependent on text length and a comparative analysis of the results of the different indices for different text types is presented.
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