Dear all,
I would like to subset a dataframe using multiple conditions.
So if I have two columns 1 and 2, I would like to EXCLUDE all rows in which
the value of column 1 is "a" AND the value of column 2 is "b".
I tried data[(data$column1 != "a" & data$column2 != "b"),] but that deletes
me every row in which either 1 is "a" or 2 is "b".
Any ideas?
Thanks so much
K

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