On 23/01/2008, at 2:02 PM, hadley wickham wrote:
> No one else mentioned this, but if those 99s represent missings, you
> should be using NA not a special numeric value.
Amen, bro. Using ``99'' to represent a missing value is
a heinous, if all too often inflicted, crime against humanity.
cheers,
Rolf Turner
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