RE: st: STATA Vs. SAS

[Fred Wolfe <fwolfe@arthritis-research.org>]

> Yes, that's what I meant.  In my simple example, using the Stata
> alternative isn't such a problem, but often I want to apply a subcondition
> to only some values.  So, e.g.,
>
> if x=0 then y=1;
> else if 1 < x < 10 then do;
>   <other sas commands>;
> end;
> else if 11 < x < 20 then do;
>   <other sas commands>;
> end;
>
>
> It's difficult and tedious to have to write the multiple levels of
> conditions if the program is going to evaluate every if statement.
In general, this type of code often works very well:

gen y = 1 if x == 0
some command if inrange(x,2,9)
... more .. if needed
some command if inrange(x,12,19)
... more .. if needed

Practically, if the if condition is complicated one often makes a new 
variable or local macro, as in

gen newvar = cond(x == 1 & age >27 & date >mdy(01,01,2002),1,0)

then just using - if newvar- for the if condition.



Fred Wolfe





---------------------------------------------------------------------------- 
------------------------
Fred Wolfe                                                          Tel 
(316) 263-2125
National Data Bank for Rheumatic Diseases         Fax (316) 263-0761
Wichita, 
Kansas                                    fwolfe@arthritis-research.org
---------------------------------------------------------------------------- 
-------------------------

*
*   For searches and help try:
*   http://www.stata.com/support/faqs/res/findit.html
*   http://www.stata.com/support/statalist/faq
*   http://www.ats.ucla.edu/stat/stata/