I am analysing a textual corpus with 34 obituaries of a recently deceased writer from the point of view of Discourse Analysis. I think that a quantitative analysis of the lexicon used would be interesting. Specifically, I am looking for a way of detecting the specific lexis of these texts (verbs, nouns, adjectives, collocations...). In some articles I have seen that they study the specific lexicon of a politician by comparing it with that of another politician. Here the comparison would be with a general language corpus such as CREA (Corpus de Referencia del Español Actual). I would be grateful for ideas about methods (formulas, programmes...) to measure lexical specificity.