Hi
Are you one of my 380 students? If so, please contact me directly about
any difficulties you are having with assignment work. Sending questions
via R-help like this is inefficient because there is a chance that I
might not spot it.
At the very least, you should declare to all of the kin
Dear All,
In R, is there a way (or a function) I can quickly check whether all the NA
values in one new created numerical variable happened are because of
or something else in the original dataset? And how can we easily group these
NAs separately based on different reason (e.g. some NA are
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