RE: st: RE: Taking averages, etc.

[Richard Williams <Richard.A.Williams.5@nd.edu>]

At 01:30 PM 12/17/2003 +0000, Nick Cox wrote:
> Let's not lose sight of where we started.
> Stata has standard constructs
>
> if ... {
>
> }
> else {
>
> }
>
> too; the point is that the conditional
> testing cannot be vectorised.
Just so I'm clear as to what you mean:  If I understand this correctly, if 
the statement is something like

if x1==1 {

and x1 = 1 for the FIRST case, then the statement is true, otherwise false; 
it won't matter what x1 = for the 2nd case.  So, this kind of structure is 
not useful for case by case changes. It is useful for things like your earlier

if r(N) == 0 su mpg

where the value of r(N) (or whatever) is not going to change case by 
case.  Sound right?

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