I tried to use "paneliperf" in package SensoMinR, I imported my data "Choco" , my data looked like exactly same with data "sensochoc" in this package. the only difference is the value.
   
  I tried to run the code, res<-paneliperf(choco, formul = "~Product+Panelist+Session+
  Product:Panelist+Product:Session+Panelist:Session",  formul.j = "~Product", col.j = 1, firstvar = 5, synthesis = TRUE), 
   
  the error message is 
"Error in `[.data.frame`(aux, 1, 5) : undefined columns selected"
   
  What is that , how to fix that?
   
  Thank a lot.

 		
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