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Of special importance will be those elements that stand out for presenting a positive temporal evolution. Four algorithms are proposed in order to analyze the different situations. Finally, the applicability of the results is shown thought an example where the opinion of the clients of several hotels is analyzed taking into account both the type of traveler considered and the different aspects of the establishments on which a score is given.<\/jats:p>","DOI":"10.3233\/jifs-189102","type":"journal-article","created":{"date-parts":[[2020,8,4]],"date-time":"2020-08-04T12:48:29Z","timestamp":1596545309000},"page":"6351-6362","source":"Crossref","is-referenced-by-count":0,"title":["Knowledge extraction from L-fuzzy contexts associated with criteria evolving over time"],"prefix":"10.1177","volume":"39","author":[{"given":"Cristina","family":"Alcalde","sequence":"first","affiliation":[{"name":"Department of Applied Mathematics, University of the Basque Country - UPV\/EHU, Plaza Europa 1, San Sebastian, Spain"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Ana","family":"Burusco","sequence":"additional","affiliation":[{"name":"Department of Statistics, Computer Science and Mathematics, Institute of Smart Cities, Public University of Navarre, Campus de Arrosad\u00eda, Pamplona, Spain"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"179","reference":[{"key":"10.3233\/JIFS-189102_ref2","first-page":"357","article-title":"WOWA operators in fuzzy context sequences","volume":"89","author":"Alcalde","journal-title":"16th World Congress of the International-Fuzzy-Systems-Association (IFSA) \/ 9th Conference EUSFLAT 2015, Gij\u00f3n"},{"issue":"2","key":"10.3233\/JIFS-189102_ref3","doi-asserted-by":"crossref","first-page":"118","DOI":"10.1080\/03081079.2017.1410147","article-title":"Multivalued contexts associated with criteria","volume":"47","author":"Alcalde","year":"2018","journal-title":"International Journal of General Systems"},{"issue":"9","key":"10.3233\/JIFS-189102_ref4","doi-asserted-by":"crossref","first-page":"692","DOI":"10.1080\/03081079.2019.1620740","article-title":"Reduction of the size of L-fuzzy contexts. 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