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dcast fun.aggregate parameters

Like many functions in R, dcast has a ... argument that is typically used to pass additional arguments on to a function. In fact, at ?dcast, you'll find this line in the "arguments section":

... further arguments are passed to aggregating function

Thus, the correct way of writing your example would be:

dcast(dataFrame, x ~ y, value.var = 'z', fun.aggregate = mean,
na.rm = TRUE)




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