smp.1$prof<-relevel(smp.1$prof, ref="ouvrier") Error in relevel.default(smp.1$prof, ref = "ouvrier") : 'relevel' only for (unordered) factors comment resoudre dans r studio
smp.1$prof<-relevel(smp.1$prof, ref="ouvrier")
Error in relevel.default(smp.1$prof, ref = "ouvrier") :
'relevel' only for (unordered) factors