[R] length, mean, na.rm, na.omit... Hi All,

Can anyone tell me why the length function does not use na.rm? I know
how to work around it, I'm just curious to know why such a useful option
was left out.

I'm also interested in the logic of setting na.rm=TRUE as the default on
mean, sd, etc. This is the opposite of the many other stat packages I
have used, so I assume it provides some programming benefit that is not
obvious to me.

Thanks,
Bob

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