How to Perform Tukey HSD Test in R - R-bloggers

It is a multiple range test similar to the LSD test except that Tukey utilized the honestly significant difference (HSD) test or the w-procedure ... [ThisarticlewasfirstpublishedonMethods–finnstats,andkindlycontributedtoR-bloggers].(Youcanreportissueaboutthecontentonthispagehere) WanttoshareyourcontentonR-bloggers?clickhereifyouhaveablog,orhereifyoudon't. ShareTweet TukeyHSDTestinR,Whentherearethreeormoreindependentgroups,weapplyaone-wayANOVAtoseeifthereisasignificantdifference. Thep-valueforone-wayANOVAislessthan0.05indicatethatatleastoneofthetreatmentgroupsdiffersfromtheothers. OnewayANOVAtellsuswhetherthemeansofthegroupsaresignificantlydifferentornot,butwestillneedtodoaposthocmultiplecomparisontesttodigfurther. OneofthewidelyusedmethodsistheTukeyHSDtest. HowtododatareshapeinR?»DataReshaping» WhatisspecialwithTukeyHSD? ItisamultiplerangetestsimilartotheLSDtestexceptthatTukeyutilizedthehonestlysignificantdifference(HSD)testorthew-procedure. Anytwotreatmentsthatmeanhavingadifferencemorethanhonestlysignificantdifferencearesaidtobesignificantlydifferent,otherwisenot. TukeyHSDTestinR TheTukeyHSDtestallowsforallpossiblepairwisecomparisonswhilekeepingthefamily-wiseerrorratelow. Step1:ANOVAModel Forthedifferenceidentification,establishadataframewiththreeindependentgroupsandfitaone-wayANOVAmodel. set.seed(1045) dataF)    group        2 400.7 200.35    9.90.000107*** Residuals  1172367.8  20.24                     --- Signif.codes: 0‘***’0.001‘**’0.01‘*’0.05‘.’0.1‘’ Theobservedp-valuefromtheANOVAtableislessthan0.05,indicatingthatthereisenoughevidencetoconcludethatthegroupmeansarenotequal. HowtoreadastockchartpatternChartReadingTechnique Step2:PerformTukeyHSDTest. TukeyHSD(model,conf.level=.95) Tukeymultiplecomparisonsofmeans    95%family-wiseconfidencelevel Fit:aov(formula=values~group,data=data) $group           diff       lwr     upr    padj P2-P1-1.524566-3.91251880.8633870.2873372 P3-P1 2.882295 0.49434255.2702480.0135957 P3-P2 4.406861 2.01890846.7948140.0000765 P3vsP1andP3vsP2aresignificantlydifferentatthe95percentconfidencelevel,accordingtotheTukeyHSDtest. Step3:Visualization TukeyHSD()functionallowsustovisualizetheconfidenceintervals plot(TukeyHSD(model,conf.level=.95),las=2) CorrelationAnalysisinR?»KarlPearsoncorrelationcoefficient» SubscribetotheNewsletterandCOMMENTbelow! ThepostHowtoPerformTukeyHSDTestinRappearedfirstonfinnstats. Related ShareTweet Toleaveacommentfortheauthor,pleasefollowthelinkandcommentontheirblog:Methods–finnstats. R-bloggers.comoffersdailye-mailupdatesaboutRnewsandtutorialsaboutlearningRandmanyothertopics.Clickhereifyou'relookingtopostorfindanR/data-sciencejob. 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