How to count unique values in r

Get the unique values of the variable using unique().

How to count the number of unique values in a column in r

dummyData = rep(c(1,2, 2, 2), 25)

table(dummyData)
# dummyData
#  1  2 
# 25 75

## or another presentation of the same data
as.data.frame(table(dummyData))
#    dummyData Freq
#  1         1   25
#  2         2   75

-1

Source: stackoverflow.com

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