{"id":"https://openalex.org/W2141508009","doi":"https://doi.org/10.1109/fuzzy.2008.4630442","title":"Rough sets approximations in data tables containing missing values","display_name":"Rough sets approximations in data tables containing missing values","publication_year":2008,"publication_date":"2008-06-01","ids":{"openalex":"https://openalex.org/W2141508009","doi":"https://doi.org/10.1109/fuzzy.2008.4630442","mag":"2141508009"},"language":"en","primary_location":{"id":"doi:10.1109/fuzzy.2008.4630442","is_oa":false,"landing_page_url":"https://doi.org/10.1109/fuzzy.2008.4630442","pdf_url":null,"source":null,"license":null,"license_id":null,"version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"2008 IEEE International Conference on Fuzzy Systems (IEEE World Congress on Computational Intelligence)","raw_type":"proceedings-article"},"type":"article","indexed_in":["crossref"],"open_access":{"is_oa":false,"oa_status":"closed","oa_url":null,"any_repository_has_fulltext":false},"authorships":[{"author_position":"first","author":{"id":"https://openalex.org/A5101019596","display_name":"Michinori Nakata","orcid":null},"institutions":[{"id":"https://openalex.org/I61575859","display_name":"Josai International University","ror":"https://ror.org/039pch476","country_code":"JP","type":"education","lineage":["https://openalex.org/I61575859"]}],"countries":["JP"],"is_corresponding":true,"raw_author_name":"Michinori Nakata","raw_affiliation_strings":["Faculty of Management and Information Science, Josai International University, Togane, Chiba, Japan"],"affiliations":[{"raw_affiliation_string":"Faculty of Management and Information Science, Josai International University, Togane, Chiba, Japan","institution_ids":["https://openalex.org/I61575859"]}]},{"author_position":"last","author":{"id":"https://openalex.org/A5051247319","display_name":"Hiroshi Sakai","orcid":"https://orcid.org/0000-0002-5382-9379"},"institutions":[{"id":"https://openalex.org/I207014233","display_name":"Kyushu Institute of Technology","ror":"https://ror.org/02278tr80","country_code":"JP","type":"education","lineage":["https://openalex.org/I207014233"]}],"countries":["JP"],"is_corresponding":false,"raw_author_name":"Hiroshi Sakai","raw_affiliation_strings":["Department of Mathematics and Computer Aided Science, Kyushu Institute of Technology, Fukuoka, Japan"],"affiliations":[{"raw_affiliation_string":"Department of Mathematics and Computer Aided Science, Kyushu Institute of Technology, Fukuoka, Japan","institution_ids":["https://openalex.org/I207014233"]}]}],"institutions":[],"countries_distinct_count":1,"institutions_distinct_count":2,"corresponding_author_ids":["https://openalex.org/A5101019596"],"corresponding_institution_ids":["https://openalex.org/I61575859"],"apc_list":null,"apc_paid":null,"fwci":1.6021,"has_fulltext":false,"cited_by_count":8,"citation_normalized_percentile":{"value":0.84767515,"is_in_top_1_percent":false,"is_in_top_10_percent":false},"cited_by_percentile_year":{"min":89,"max":96},"biblio":{"volume":null,"issue":null,"first_page":"673","last_page":"680"},"is_retracted":false,"is_paratext":false,"is_xpac":false,"primary_topic":{"id":"https://openalex.org/T11063","display_name":"Rough Sets and Fuzzy Logic","score":0.9998999834060669,"subfield":{"id":"https://openalex.org/subfields/1703","display_name":"Computational Theory and Mathematics"},"field":{"id":"https://openalex.org/fields/17","display_name":"Computer Science"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}},"topics":[{"id":"https://openalex.org/T11063","display_name":"Rough Sets and Fuzzy Logic","score":0.9998999834060669,"subfield":{"id":"https://openalex.org/subfields/1703","display_name":"Computational Theory and Mathematics"},"field":{"id":"https://openalex.org/fields/17","display_name":"Computer Science"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}},{"id":"https://openalex.org/T10181","display_name":"Natural Language Processing Techniques","score":0.941100001335144,"subfield":{"id":"https://openalex.org/subfields/1702","display_name":"Artificial Intelligence"},"field":{"id":"https://openalex.org/fields/17","display_name":"Computer Science"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}},{"id":"https://openalex.org/T11106","display_name":"Data Management and Algorithms","score":0.9387999773025513,"subfield":{"id":"https://openalex.org/subfields/1711","display_name":"Signal Processing"},"field":{"id":"https://openalex.org/fields/17","display_name":"Computer Science"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}}],"keywords":[{"id":"https://openalex.org/keywords/rough-set","display_name":"Rough set","score":0.7764392495155334},{"id":"https://openalex.org/keywords/equivalence","display_name":"Equivalence (formal languages)","score":0.7648591995239258},{"id":"https://openalex.org/keywords/missing-data","display_name":"Missing data","score":0.6728579998016357},{"id":"https://openalex.org/keywords/mathematics","display_name":"Mathematics","score":0.6294145584106445},{"id":"https://openalex.org/keywords/equivalence-class","display_name":"Equivalence class (music)","score":0.6287429332733154},{"id":"https://openalex.org/keywords/approximations-of-\u03c0","display_name":"Approximations of \u03c0","score":0.5919061303138733},{"id":"https://openalex.org/keywords/class","display_name":"Class (philosophy)","score":0.5178354382514954},{"id":"https://openalex.org/keywords/discrete-mathematics","display_name":"Discrete mathematics","score":0.397054523229599},{"id":"https://openalex.org/keywords/applied-mathematics","display_name":"Applied mathematics","score":0.3229182958602905},{"id":"https://openalex.org/keywords/data-mining","display_name":"Data mining","score":0.28320181369781494},{"id":"https://openalex.org/keywords/computer-science","display_name":"Computer science","score":0.27911871671676636},{"id":"https://openalex.org/keywords/statistics","display_name":"Statistics","score":0.23279234766960144},{"id":"https://openalex.org/keywords/artificial-intelligence","display_name":"Artificial intelligence","score":0.14825528860092163}],"concepts":[{"id":"https://openalex.org/C111012933","wikidata":"https://www.wikidata.org/wiki/Q3137210","display_name":"Rough set","level":2,"score":0.7764392495155334},{"id":"https://openalex.org/C2780069185","wikidata":"https://www.wikidata.org/wiki/Q7977945","display_name":"Equivalence (formal languages)","level":2,"score":0.7648591995239258},{"id":"https://openalex.org/C9357733","wikidata":"https://www.wikidata.org/wiki/Q6878417","display_name":"Missing data","level":2,"score":0.6728579998016357},{"id":"https://openalex.org/C33923547","wikidata":"https://www.wikidata.org/wiki/Q395","display_name":"Mathematics","level":0,"score":0.6294145584106445},{"id":"https://openalex.org/C2777044963","wikidata":"https://www.wikidata.org/wiki/Q5384707","display_name":"Equivalence class (music)","level":2,"score":0.6287429332733154},{"id":"https://openalex.org/C193386753","wikidata":"https://www.wikidata.org/wiki/Q1130396","display_name":"Approximations of \u03c0","level":2,"score":0.5919061303138733},{"id":"https://openalex.org/C2777212361","wikidata":"https://www.wikidata.org/wiki/Q5127848","display_name":"Class (philosophy)","level":2,"score":0.5178354382514954},{"id":"https://openalex.org/C118615104","wikidata":"https://www.wikidata.org/wiki/Q121416","display_name":"Discrete mathematics","level":1,"score":0.397054523229599},{"id":"https://openalex.org/C28826006","wikidata":"https://www.wikidata.org/wiki/Q33521","display_name":"Applied mathematics","level":1,"score":0.3229182958602905},{"id":"https://openalex.org/C124101348","wikidata":"https://www.wikidata.org/wiki/Q172491","display_name":"Data mining","level":1,"score":0.28320181369781494},{"id":"https://openalex.org/C41008148","wikidata":"https://www.wikidata.org/wiki/Q21198","display_name":"Computer science","level":0,"score":0.27911871671676636},{"id":"https://openalex.org/C105795698","wikidata":"https://www.wikidata.org/wiki/Q12483","display_name":"Statistics","level":1,"score":0.23279234766960144},{"id":"https://openalex.org/C154945302","wikidata":"https://www.wikidata.org/wiki/Q11660","display_name":"Artificial intelligence","level":1,"score":0.14825528860092163}],"mesh":[],"locations_count":1,"locations":[{"id":"doi:10.1109/fuzzy.2008.4630442","is_oa":false,"landing_page_url":"https://doi.org/10.1109/fuzzy.2008.4630442","pdf_url":null,"source":null,"license":null,"license_id":null,"version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"2008 IEEE International Conference on Fuzzy Systems (IEEE World Congress on Computational Intelligence)","raw_type":"proceedings-article"}],"best_oa_location":null,"sustainable_development_goals":[{"id":"https://metadata.un.org/sdg/10","display_name":"Reduced inequalities","score":0.4399999976158142}],"awards":[],"funders":[],"has_content":{"pdf":false,"grobid_xml":false},"content_urls":null,"referenced_works_count":32,"referenced_works":["https://openalex.org/W175508730","https://openalex.org/W232881907","https://openalex.org/W1522442466","https://openalex.org/W1549911309","https://openalex.org/W1557923305","https://openalex.org/W1559918745","https://openalex.org/W1566926336","https://openalex.org/W1570206053","https://openalex.org/W1792942378","https://openalex.org/W1823469408","https://openalex.org/W1840985414","https://openalex.org/W1974088341","https://openalex.org/W1979029381","https://openalex.org/W1990391007","https://openalex.org/W1998015481","https://openalex.org/W2005532330","https://openalex.org/W2087740657","https://openalex.org/W2095290023","https://openalex.org/W2098034130","https://openalex.org/W2103514965","https://openalex.org/W2117100923","https://openalex.org/W2139722852","https://openalex.org/W2142864156","https://openalex.org/W2160047456","https://openalex.org/W2163963159","https://openalex.org/W2922740565","https://openalex.org/W4206031975","https://openalex.org/W4231826163","https://openalex.org/W6607131562","https://openalex.org/W6632961854","https://openalex.org/W6633472634","https://openalex.org/W6638362732"],"related_works":["https://openalex.org/W1998730025","https://openalex.org/W2382232876","https://openalex.org/W2129446955","https://openalex.org/W2108505753","https://openalex.org/W1899771913","https://openalex.org/W2763761511","https://openalex.org/W2182642161","https://openalex.org/W4255196547","https://openalex.org/W2358659170","https://openalex.org/W146502352"],"abstract_inverted_index":{"Rough":[0],"sets":[1],"are":[2],"applied":[3],"to":[4,34],"data":[5],"tables":[6],"containing":[7],"missing":[8,28],"values.":[9],"A":[10,38],"new":[11],"method,":[12],"called":[13],"a":[14],"method":[15],"of":[16,27,40,65,87],"possible":[17,41,49,66,88],"equivalence":[18,42,50,67],"classes,":[19,68],"is":[20,30,44,57],"proposed.":[21],"Discernibility":[22],"as":[23,25],"well":[24],"indiscernibility":[26],"values":[29],"considered":[31],"in":[32,46],"order":[33],"improve":[35],"previous":[36],"results.":[37],"family":[39,64],"classes":[43],"obtained,":[45],"which":[47],"each":[48],"class":[51],"has":[52],"the":[53,63,78],"possibility":[54],"that":[55],"it":[56],"an":[58],"actual":[59],"one.":[60],"By":[61],"using":[62],"we":[69],"derive":[70],"lower":[71,76],"and":[72,77],"upper":[73,79],"approximations.":[74],"The":[75],"approximations":[80],"coincide":[81],"with":[82],"ones":[83],"obtained":[84],"from":[85],"methods":[86],"worlds.":[89]},"counts_by_year":[{"year":2015,"cited_by_count":1},{"year":2013,"cited_by_count":2},{"year":2012,"cited_by_count":1}],"updated_date":"2025-11-06T03:46:38.306776","created_date":"2025-10-10T00:00:00"}
