How to remove rows that have only 1 combination for a given ID

Question

I have a dataframe like this

ID <- c(\"A\",\"A\",\"A\",\"B\",\"B\",\"C\",\"C\")
Measurement <- c (\"Length\",\"Breadth\",\"Breadth\",\"Breadth\",\"Leng         


        

Answer 1

Another option is using anyDuplicated

df[with(df, ave(as.character(Measurement), ID, FUN = anyDuplicated)!=0),]