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2008 Oct 29
2
behavior of "by"
Any insight into the behavior of "by" in the following case would be appreciated. There is a note in the help details for "by" about documenting behavior since v2.7 but I don't entirely understand what it is saying. I'm using R2.7.2 Windows. I'm interested if the following behavior was a change or whether it has always worked this way. I looked at