Dear All,
   
  I would be grateful if you can tell how can I suppress the legend (automatically created) when I plot a groupedData. 
   
  suppose that I have data farme df_0 which contains the following columns:   ID represents  the clusters, t  represents time of observation, Y: the variable of interest and X a binary covariate. Then: 
   
  df_1 <- groupedData(Y ~ t | ID)
   
  plot(df_1, outer ~X)
   
  This gives me the plot (Y ~ t) for each cluster with a legend containing all the clusters. 
   
  How can I drop the legend?
   
  Thanks you very much,
   
  Bernard,
   
   

		
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