Frank E Harrell Jr wrote:
>
>
> Here's a case where SAS is clearly not superior:
>
> IF type='TRUCK' AND count<12 THEN vehicles=truck+(car+bike)/2.2;
>
> If count is missing, the statement is considered TRUE and the THEN is
> executed. This is because SAS considers a missing as less than any
> number. This resulted in a significant error, never corrected, in a
> widely cited New England Journal of Medicine paper.
>
>
Which is an argument against the implementation, not against the syntax.
Dieter
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