mean-aggregate – but use unique for factor variables
In the absence of data via dput() or other wise .... I would assume that if you made your function FUN something like: function(x) if(is.factor(x)) unique(x) else mean(x) (or maybe length(unique(x)) as first clause) you'd get what you want. No? On Tue, Sep 25, 2012 at 2:32 PM, Martin Batholdy
<batholdy at googlemail.com> wrote:
Hi, I have a data.frame which I want to aggregate. There are some grouping variables and some continuous variables for which I would like to have the mean. However there are also some factor-variables in the data-frame that are not grouping variables and I actually would like to aggregate these variables with the unique() function. Is that possible with the standard aggregate-function? If I use it like this: aggregate(data, by=list(data$grouping1, data$grouping2), FUN=mean) I get vectors of NAs for the other factor-variables in the data.frame. But I actually want the unique value ? Is that possible? thanks!
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