I am trying to run a duncan-waller test, but i don't get how to implement it. These my scripts based on dataframe "lookout": attach(lookout) sqrt.res<-sqrt(res.hr.km) bartlett.test(sqrt.res~time_slot)#no homoscedasticity welchtest<-oneway.test(sqrt.res~time_slot)#means are differents wallertest<-waller.test(welchtest, "time_slot", group=FALSE) It always gives me the following error: cannot coerce class '"htest"' into a data.frame What to do with this? thanks [[alternative HTML version deleted]]