Duncan's new multiple range test - R

This test is adapted from the Newman-Keuls method. Duncan's test does not control family wise error rate at the specified alpha level. It has more power than ... duncan.test{agricolae}RDocumentation Duncan'snewmultiplerangetest Description ThistestisadaptedfromtheNewman-Keulsmethod.Duncan'stestdoesnotcontrolfamilywiseerrorrateatthespecifiedalphalevel.Ithasmorepowerthantheotherposttests,butonlybecauseitdoesn'tcontroltheerrorrateproperly.TheExperimentwiseErrorRateat:1-(1-alpha)^(a-1);where"a"isthenumberofmeansandisthePer-ComparisonErrorRate.Duncan'sprocedureisonlyveryslightlymoreconservativethanLSD.Thelevelbyalphadefaultis0.05. Usage duncan.test(y,trt,DFerror,MSerror,alpha=0.05,group=TRUE,main=NULL,console=FALSE) Arguments y model(aovorlm)oransweroftheexperimentalunit trt Constant(onlyy=model)orvectortreatmentappliedtoeachexperimentalunit DFerror Degreefree MSerror MeanSquareError alpha Significantlevel group TRUEorFALSE main Title console logical,printoutput Details Itisnecessaryfirstmakesaanalysisofvariance. ify=model,thentoapplytheinstruction: duncan.test(model,"trt",alpha=0.05,group=TRUE,main=NULL,console=FALSE) wherethemodelclassisaovorlm. Value statistics Statisticsofthemodel parameters Designparameters duncan CriticalRangeTable means Statisticalsummaryofthestudyvariable comparison Comparisonbetweentreatments groups Formationoftreatmentgroups Author(s) FelipedeMendiburu References 1.Principlesandproceduresofstatisticsabiometricalapproach Steel&Torry&Dickey.ThirdEdition1997 2.Multiplecomparisonstheoryandmethods.Departamentofstatistics theOhioStateUniversity.USA,1996.JasonC.Hsu.ChapmanHall/CRC. SeeAlso BIB.test,DAU.test,durbin.test, friedman,HSD.test,kruskal, LSD.test,Median.test,PBIB.test, REGW.test,scheffe.test,SNK.test, waerden.test,waller.test,plot.group Examples library(agricolae) data(sweetpotato) model