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Hello, Suppose that i have a dataframe a <- read.dta("banca_impresa.dta") i have a column with 17900 obs like 1 2 3 1 6 7 8 3 4 4 and i want to know the number of the different values so in this case it would be 7 How can i do? Thank you -- View this message in context: http://r.789695.n4.nabble.com/How-to-count-the-number-of-different-elements-in-a-column-tp4650825.html Sent