What is Fisher's least significant difference (LSD) method for ...
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Fisher's LSD method is used in ANOVA to create confidence intervals for all pairwise differences between factor level means while controlling the individual ... menuMinitab® 21SupportWhatisFisher'sleastsignificantdifference(LSD)methodformultiplecomparisons?LearnmoreaboutMinitabStatisticalSoftware Fisher'sLSDmethodisusedinANOVAtocreateconfidenceintervalsforallpairwisedifferencesbetweenfactorlevelmeanswhilecontrollingtheindividualerrorratetoasignificancelevelyouspecify.Fisher'sLSDmethodthenusestheindividualerrorrateandnumberofcomparisonstocalculatethesimultaneousconfidencelevelforallconfidenceintervals.Thissimultaneousconfidencelevelistheprobabilitythatallconfidenceintervalscontainthetruedifference.ItisimportanttoconsiderthefamilyerrorratewhenmakingmultiplecomparisonsbecauseyourchancesofcommittingatypeIerrorforaseriesofcomparisonsisgreaterthantheerrorrateforanyonecomparisonalone. ExampleofFisher'sLSDmethod Forexample,youaremeasuringtheresponsetimesformemorychips.Youtakeasampleof25chipsfromfivedifferentmanufacturers.TheANOVAresultedinap-valueof0.01,leadingyoutoconcludethatatleastoneofthemanufacturermeansisdifferentfromtheothers. Youdecidetoexamineall10comparisonsbetweenthefiveplantstodeterminespecificallywhichmeansaredifferent.UsingFisher'sLSDmethod,youspecifythateachcomparisonshouldhaveanindividualerrorrateof0.05(equivalenttoa95%confidencelevel).Minitabcreatestheseten95%confidenceintervalsandcalculatesthatthissetyieldsa71.79%simultaneousconfidencelevel.Understandingthiscontext,youcanthenexaminetheconfidenceintervalstodeterminewhetheranydonotincludezero,identifyingasignificantdifference. Minitab.comLicensePortalStoreBlogContactUsCopyright©2022Minitab,LLC.AllrightsReserved.EnglishfrançaisDeutschportuguêsespañol日本語한국어中文（简体）Byusingthissiteyouagreetotheuseofcookiesforanalyticsandpersonalizedcontent. ReadourpolicyOK
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