[R] SAS-like method of recoding variables?

[Dieter Menne]

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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