{"id":26638,"date":"2023-02-08T09:50:00","date_gmt":"2023-02-08T12:50:00","guid":{"rendered":"https:\/\/mindthegraph.com\/blog\/the-science-behind-falling-in-love-copy\/"},"modified":"2023-04-05T10:55:10","modified_gmt":"2023-04-05T13:55:10","slug":"statistics-parametric-tests","status":"publish","type":"post","link":"https:\/\/mindthegraph.com\/blog\/nb\/statistikk-parametriske-tester\/","title":{"rendered":"Hva er parametriske statistiske tester og hvor kan de brukes?"},"content":{"rendered":"<p>Statistics parametric tests are a type of statistical analysis used to test hypotheses about the population mean and variance. These tests are based on the assumption that the underlying data follows a normal distribution and have several key properties, including robustness, reliability, and the ability to detect subtle differences in the data.<\/p>\n\n\n\n<p>Parametric tests are often used in a variety of different applications, including medical research, market research, and social sciences. In these fields, researchers may use parametric tests to determine the significance of changes in population means or variances, or to determine if a particular treatment or intervention has had a significant impact on the data.<\/p>\n\n\n\n<h2>De vanligste typene parametriske tester<\/h2>\n\n\n\n<h3>T-testen&nbsp;<\/h3>\n\n\n\n<p>En av de mest brukte parametriske testene er t-testen, som brukes til \u00e5 sammenligne gjennomsnittene til to populasjoner. Den <a href=\"https:\/\/www.ncbi.nlm.nih.gov\/pmc\/articles\/PMC4667138\/\">t-test<\/a> assumes that the underlying data is normally distributed and that the variances of the two populations are equal. The test statistic is calculated using the difference in the means of the two populations, divided by the standard error of the difference.<\/p>\n\n\n\n<h3>ANOVA-test<\/h3>\n\n\n\n<p>En annen vanlig parametrisk test er variansanalyse (ANOVA), som brukes til \u00e5 sammenligne gjennomsnittene til tre eller flere populasjoner. Den <a href=\"https:\/\/jbhender.github.io\/Stats506\/F18\/GP\/Group3.html\">ANOVA-test<\/a> forutsetter at de underliggende dataene er normalfordelte og at variansen i alle populasjonene er lik. Teststatistikken beregnes ved hjelp av forholdet mellom variansen mellom populasjonene og variansen innad i populasjonene.<\/p>\n\n\n\n<h3>Andre parametriske tester<\/h3>\n\n\n\n<p>In addition to the t-test and ANOVA, there are several other statistics parametric tests that are used in different applications, including the paired t-test, the one-way ANOVA, the two-way ANOVA, the repeated measures ANOVA, and the mixed-design ANOVA. Each of these tests has different assumptions and test statistics, and is used to address different types of research questions.<\/p>\n\n\n\n<p>En av de viktigste fordelene med parametriske tester er at de er robuste, det vil si at de ikke er f\u00f8lsomme for formen p\u00e5 den underliggende datafordelingen. S\u00e5 lenge dataene er tiln\u00e6rmet normalfordelte, kan parametriske tester gi n\u00f8yaktige resultater.<\/p>\n\n\n\n<h2>Lag fantastisk infografikk p\u00e5 f\u00e5 minutter<\/h2>\n\n\n\n<p>Mind the Graph is the perfect tool to bring your data together and present them visually. Use charts, tables and scientific illustrations to make your work easier to understand.<\/p>\n\n\n\n<div style=\"height:18px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<div class=\"is-layout-flex wp-block-buttons\">\n<div class=\"wp-block-button aligncenter\"><a class=\"wp-block-button__link has-background wp-element-button\" href=\"https:\/\/mindthegraph.com\/\" style=\"border-radius:50px;background-color:#dc1866\" target=\"_blank\" rel=\"noreferrer noopener\">Lag min f\u00f8rste infografikk<\/a><\/div>\n<\/div>\n\n\n\n<div style=\"height:18px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2>P\u00e5liteligheten til statistiske parametriske tester<\/h2>\n\n\n\n<p>En annen fordel med parametriske tester er at de er p\u00e5litelige, ettersom de er basert p\u00e5 veletablerte statistiske metoder og forutsetninger. Resultatene fra parametriske tester er sv\u00e6rt repeterbare og kan brukes til \u00e5 trekke gyldige slutninger om den underliggende populasjonen.<\/p>\n\n\n\n<p>Selv om parametriske tester har mange fordeler, er de ikke alltid det beste valget for alle datasett. I noen tilfeller kan det hende at de underliggende dataene ikke er normalfordelte, eller at variansene i populasjonene ikke er like. I slike tilfeller kan ikke-parametriske tester v\u00e6re mer hensiktsmessige.<\/p>\n\n\n\n<h2>Parametriske tester vs. ikke-parametriske tester<\/h2>\n\n\n\n<p>Ikke-parametriske tester er en type statistisk analyse som ikke gj\u00f8r noen antakelser om den underliggende datafordelingen. I stedet baserer de seg p\u00e5 rangeringen av dataene for \u00e5 avgj\u00f8re om resultatene er signifikante. Noen vanlige ikke-parametriske tester inkluderer <a href=\"https:\/\/data.library.virginia.edu\/the-wilcoxon-rank-sum-test\/\">Wilcoxon rang-sum-test<\/a>, den <a href=\"https:\/\/en.wikipedia.org\/wiki\/Kruskal%E2%80%93Wallis_one-way_analysis_of_variance\">Kruskal-Wallis-test<\/a>, og den <a href=\"https:\/\/en.wikipedia.org\/wiki\/Mann%E2%80%93Whitney_U_test\">Mann-Whitney-test<\/a>.<\/p>\n\n\n\n<p>When choosing between parametric and non-parametric tests, it is important to consider the nature of the data and the research question being addressed. In general, parametric tests are appropriate for data that is normally distributed and has equal variances, while non-parametric tests are appropriate for data that does not meet these assumptions.<\/p>\n\n\n\n<h2>Eksempel p\u00e5 en statistisk parametrisk test<\/h2>\n\n\n\n<p>Anta at en forsker er interessert i \u00e5 teste om det er forskjell p\u00e5 gjennomsnittsh\u00f8yden til to grupper barn - gruppe A og gruppe B. For \u00e5 gj\u00f8re dette velger forskeren tilfeldig ut 20 barn fra hver gruppe og m\u00e5ler h\u00f8yden deres.<\/p>\n\n\n\n<p>Forskeren \u00f8nsker \u00e5 finne ut om gjennomsnittsh\u00f8yden til barna i gruppe A er forskjellig fra gjennomsnittsh\u00f8yden til barna i gruppe B. For \u00e5 teste denne hypotesen kan forskeren bruke en t-test med to utvalg. T-testen forutsetter at de underliggende dataene er normalfordelte og at variansen i de to gruppene er lik.<\/p>\n\n\n\n<p>Forskeren beregner gjennomsnittsh\u00f8yden for hver gruppe og finner at gjennomsnittsh\u00f8yden for gruppe A er 150 cm og gjennomsnittsh\u00f8yden for gruppe B er 155 cm. Forskeren beregner deretter standardavviket for hver gruppe og finner at standardavviket for gruppe A er 5 cm og standardavviket for gruppe B er 4 cm.<\/p>\n\n\n\n<p>Next, the researcher calculates the t-statistic using the difference in the means of the two groups, divided by the standard error of the difference. If the t-statistic is larger than a critical value determined by the level of significance and degrees of freedom, the researcher can conclude that there is a significant difference in the mean height of children in Group A and Group B.<\/p>\n\n\n\n<p>Dette eksemplet viser hvordan en t-test med to utvalg kan brukes til \u00e5 teste en hypotese om forskjellen i gjennomsnittet til to grupper. T-testen er en kraftig og mye brukt parametrisk test som gir en robust og p\u00e5litelig m\u00e5te \u00e5 teste hypoteser om populasjonsgjennomsnittet p\u00e5.<\/p>\n\n\n\n<h2>Kraftige verkt\u00f8y for analyse av data<\/h2>\n\n\n\n<p>Parametriske tester er et effektivt verkt\u00f8y for statistisk analyse, og de gir robuste og p\u00e5litelige resultater for et bredt spekter av bruksomr\u00e5der. Det er imidlertid viktig \u00e5 velge riktig test basert p\u00e5 dataenes art og forskningssp\u00f8rsm\u00e5let som skal besvares. Uansett om man bruker parametriske eller ikke-parametriske tester, er m\u00e5let med statistisk analyse alltid \u00e5 trekke gyldige slutninger om den underliggende populasjonen og \u00e5 trekke meningsfulle konklusjoner fra dataene.<\/p>\n\n\n\n<h2>Ingenting er bedre enn et perfekt visuelt uttrykk som formidler et komplekst budskap.<\/h2>\n\n\n\n<p>Har du problemer med \u00e5 kommunisere en stor mengde informasjon? Bruk infografikk og illustrasjoner for \u00e5 gj\u00f8re arbeidet ditt mer forst\u00e5elig og tilgjengelig. Mind the Graph er et utmerket verkt\u00f8y for forskere som \u00f8nsker \u00e5 gj\u00f8re arbeidet sitt mer effektivt ved hjelp av visuelt attraktive infografikker.&nbsp;<\/p>\n\n\n\n<div style=\"height:18px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><img decoding=\"async\" loading=\"lazy\" width=\"600\" height=\"338\" src=\"https:\/\/mindthegraph.com\/blog\/wp-content\/uploads\/2022\/09\/3iezpf5xkd3.gif\" alt=\"\" class=\"wp-image-20197\"\/><\/figure><\/div>\n\n\n<div style=\"height:18px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<div class=\"is-layout-flex wp-block-buttons\">\n<div class=\"wp-block-button aligncenter\"><a class=\"wp-block-button__link has-background wp-element-button\" href=\"https:\/\/mindthegraph.com\/\" style=\"border-radius:50px;background-color:#dc1866\" target=\"_blank\" rel=\"noreferrer noopener\">\u00d8ke forskningen min med illustrasjoner<\/a><\/div>\n<\/div>\n\n\n\n<div style=\"height:44px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<div style=\"height:25px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p><\/p>","protected":false},"excerpt":{"rendered":"<p>Denne artikkelen vil hjelpe deg med \u00e5 forst\u00e5 statistiske parametriske tester, de vanligste typene, samt hvor og n\u00e5r de skal brukes.<\/p>","protected":false},"author":4,"featured_media":26646,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[959,28],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v19.9 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>What are statistics parametric tests and where to apply them?<\/title>\n<meta name=\"description\" content=\"This article will help you understand statistics parametric tests, their most common types, and also where and when to apply them.\" 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He has a Ph.D. and solid scientific background in Psychopharmacology and experience as a Guest Researcher at the Max Planck Institute of Psychiatry (Germany) and Researcher in D'Or Institute for Research and Education (IDOR, Brazil). Fabricio holds over 2500 citations in Google Scholar. He has 10 years of experience in small innovative businesses, with relevant experience in product design and innovation management. 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