search for: matvol

Hello, I'm trying to analyse data from an incomplete design with four factor : - fr : number of the batch - op : ID of operator - meth : method used - mat : nature of the material used and one variable - mv : mesure - trmv : transformed mesure str(matvol) `data.frame': 120 obs. of 6 variables: $ fr : Factor w/ 30 levels "1","2","3","4",..: 1 1 1 1 2 2 2 2 3 3 ... $ op : Factor w/ 3 levels "1","2","3": 3 3 3 3 1 1 1 1 2 2 ... $ meth: Factor w/ 2 levels "1"...