> sk <- SK(x=av, y=A$R, model='y~x', which='x', dispersion='se')
Error in SK.aov(x = av, y = A$R, model = "y~x", which = "x", dispersion = "se") :
No factors in the fitted model!
In addition: Warning message:
In replications(paste("~", xx), data = mf) : non-factors ignored: M