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commodity
2011 Jan 04
1
how to subset unique factor combinations from a data frame.
Hi All
I have these questions and request members expert view on this.
a) I have a dataframe (df) with five factors (identity variables) and value
(measured value). The id variables are Year, Country, Commodity, Attribute,
Unit. Value is a value for each combination of this.
I would like to get just the unique combination of Commodity, Attribute and
Unit. I just need the unique factor