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[{"key": "dc.contributor.advisor", "value": "K\u00e4rkk\u00e4inen, Salme", "language": null, "element": "contributor", "qualifier": "advisor", "schema": "dc"}, {"key": "dc.contributor.advisor", "value": "H\u00f6gmander, Harri", "language": null, "element": "contributor", "qualifier": "advisor", "schema": "dc"}, {"key": "dc.contributor.author", "value": "Lehtonen, Eero", "language": "", "element": "contributor", "qualifier": "author", "schema": "dc"}, {"key": "dc.date.accessioned", "value": "2024-05-31T05:34:50Z", "language": null, "element": "date", "qualifier": "accessioned", "schema": "dc"}, {"key": "dc.date.available", "value": "2024-05-31T05:34:50Z", "language": null, "element": "date", "qualifier": "available", "schema": "dc"}, {"key": "dc.date.issued", "value": "2014", "language": null, "element": "date", "qualifier": "issued", "schema": "dc"}, {"key": "dc.identifier.uri", "value": "https://jyx.jyu.fi/handle/123456789/95381", "language": null, "element": "identifier", "qualifier": "uri", "schema": "dc"}, {"key": "dc.description.abstract", "value": "Tutkielmassa on tarkoitus selvitt\u00e4\u00e4 vesimuodostumien kunnostustarvetta logistisella regressiomallilla. Vaste eli kunnostustarve on muunnos alkuper\u00e4isen\naineiston viisiportaisesta ekologinen tila -muuttujasta. Haluttiin selvitt\u00e4\u00e4,\nvoiko sit\u00e4 ennustaa aineiston rekisterimuuttujilla, koska n\u00e4m\u00e4 ovat helposti\nsaatavilla.\nKoska aineistossa oli paljon puuttuvaa tietoa, k\u00e4ytettiin sen imputoimiseen moni-imputointia. Kaksi oleellista asiaa imputoinnin toteutuksen kannalta olivat, mit\u00e4 muuttujia k\u00e4ytet\u00e4\u00e4n toisten muuttujien imputointiin ja\nmit\u00e4 imputointimenetelmi\u00e4 mihinkin muuttujaan sovelletaan. R-ohjelmiston\nmice-funktio tarjoaa vaihtoehtoja n\u00e4iden ratkaisemiseen. Tutkimusongelmaa\neli sit\u00e4, mit\u00e4 muuttujia kunnostustarpeen ennustamiseen kannattaa k\u00e4ytt\u00e4\u00e4,\nselvitettiin siten, ett\u00e4 aineistoon sovitettiin erilaisia malleja, joita vertailtiin\nuseilla kriteereill\u00e4. Esimerkiksi mallin antamaa tulosta siit\u00e4, tarvitseeko vesimuodostumaa kunnostaa, verrattiin todelliseen kunnostustarpeeseen, mik\u00e4\noli t\u00e4ss\u00e4 aineistossa tiedossa. Oleellista oli l\u00f6yt\u00e4\u00e4 ne rekisterimuuttujat, jotka\nparhaiten ennustavat kunnostustarvetta.\nImputointien perusteella kunnostustarpeen ennustamiseen kannattaa k\u00e4ytt\u00e4\u00e4 seuraavia muuttujia: leveysaste, keskisyvyys, suurin syvyys, kunnan pinta-\nala, kunnan v\u00e4kiluku, piiri, korkeus merenpinnasta, maatalousmaan osuus,\nsuuralue Helsinki, suuralue pohjoinen, suuralue etel\u00e4, valuma-alueen peltoala\nja valuma-alueen suhteellinen peltopinta-ala. Lis\u00e4ksi kannattaa k\u00e4ytt\u00e4\u00e4 leveysasteen ja maatalousmaan osuuden yhteisvaikutusta. Luokitteluvirhe imputoiduille aineistoille on viel\u00e4 11.6 % ja useimmiten viel\u00e4 niin p\u00e4in, ett\u00e4\nmalli ei l\u00f6yd\u00e4 niit\u00e4 vesimuodostumia, joilla on kunnostustarvetta. Jopa 52.5\n% vesimuodostumista, jotka olivat kunnostustarpeessa, j\u00e4i l\u00f6yt\u00e4m\u00e4tt\u00e4. Toisaalta toisin p\u00e4in luokitteluvirhe oli parempi. Kunnostustarvetta ennustettiin\n3.2 %:ssa tapauksia silloin, kun sit\u00e4 ei ollut.", "language": "fi", "element": "description", "qualifier": "abstract", "schema": "dc"}, {"key": "dc.description.provenance", "value": "Submitted by Paivi Vuorio (paelvuor@jyu.fi) on 2024-05-31T05:34:50Z\nNo. of bitstreams: 0", "language": "en", "element": "description", "qualifier": "provenance", "schema": "dc"}, {"key": "dc.description.provenance", "value": "Made available in DSpace on 2024-05-31T05:34:50Z (GMT). No. of bitstreams: 0\n Previous issue date: 2014", "language": "en", "element": "description", "qualifier": "provenance", "schema": "dc"}, {"key": "dc.format.extent", "value": "30", "language": "", "element": "format", "qualifier": "extent", "schema": "dc"}, {"key": "dc.language.iso", "value": "fin", "language": null, "element": "language", "qualifier": "iso", "schema": "dc"}, {"key": "dc.rights", "value": "In Copyright", "language": "en", "element": "rights", "qualifier": null, "schema": "dc"}, {"key": "dc.subject.other", "value": "ekologinen status", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "logistinen malli", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "luokitteluvirhe", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "moni-imputointi", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "puuttuva tieto", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "sensitiivisyysanalyysi", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.title", "value": "Logistisen regressiomallin soveltaminen ekologisen tilan ennustamiseen", "language": "", "element": "title", "qualifier": null, "schema": "dc"}, {"key": "dc.type", "value": "master thesis", "language": null, "element": "type", "qualifier": null, "schema": "dc"}, {"key": "dc.identifier.urn", "value": "URN:NBN:fi:jyu-202405314144", "language": null, "element": "identifier", "qualifier": "urn", "schema": "dc"}, {"key": "dc.type.ontasot", "value": "Master\u2019s thesis", "language": "en", "element": "type", "qualifier": "ontasot", "schema": "dc"}, {"key": "dc.type.ontasot", "value": "Pro gradu -tutkielma", "language": "fi", "element": "type", "qualifier": "ontasot", "schema": "dc"}, {"key": "dc.contributor.faculty", "value": "Faculty of Sciences", "language": "en", "element": "contributor", "qualifier": "faculty", "schema": "dc"}, {"key": "dc.contributor.faculty", "value": "Matemaattis-luonnontieteellinen tiedekunta", "language": "fi", "element": "contributor", "qualifier": "faculty", "schema": "dc"}, {"key": "dc.contributor.department", "value": "Department of Mathematics and Statistics", "language": "en", "element": "contributor", "qualifier": "department", "schema": "dc"}, {"key": "dc.contributor.department", "value": "Matematiikan ja tilastotieteen laitos", "language": "fi", "element": "contributor", "qualifier": "department", "schema": "dc"}, {"key": "dc.contributor.organization", "value": "University of Jyv\u00e4skyl\u00e4", "language": "en", "element": "contributor", "qualifier": "organization", "schema": "dc"}, {"key": "dc.contributor.organization", "value": "Jyv\u00e4skyl\u00e4n yliopisto", "language": "fi", "element": "contributor", "qualifier": "organization", "schema": "dc"}, {"key": "dc.subject.discipline", "value": "Statistics", "language": "en", "element": "subject", "qualifier": "discipline", "schema": "dc"}, {"key": "dc.subject.discipline", "value": "Tilastotiede", "language": "fi", "element": "subject", "qualifier": "discipline", "schema": "dc"}, {"key": "yvv.contractresearch.funding", "value": "0", "language": "", "element": "contractresearch", "qualifier": "funding", "schema": "yvv"}, {"key": "dc.type.coar", "value": "http://purl.org/coar/resource_type/c_bdcc", "language": null, "element": "type", "qualifier": "coar", "schema": "dc"}, {"key": "dc.rights.accesslevel", "value": "openAccess", "language": null, "element": "rights", "qualifier": "accesslevel", "schema": "dc"}, {"key": "dc.type.publication", "value": "masterThesis", "language": null, "element": "type", "qualifier": "publication", "schema": "dc"}, {"key": "dc.subject.oppiainekoodi", "value": "4043", "language": null, "element": "subject", "qualifier": "oppiainekoodi", "schema": "dc"}, {"key": "dc.subject.yso", "value": "tilastotiede", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "ekologinen tila", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.rights.url", "value": "https://rightsstatements.org/page/InC/1.0/", "language": null, "element": "rights", "qualifier": "url", "schema": "dc"}]
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