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Date:         Fri, 19 Oct 2007 15:17:03 -0000
Reply-To:     ginanicolosi@HOTMAIL.COM
Sender:       "SAS(r) Discussion" <SAS-L@LISTSERV.UGA.EDU>
From:         Gina Nicolosi <ginanicolosi@HOTMAIL.COM>
Subject:      Re: Use all numeric variables as predictors in proc reg
Comments: To:
In-Reply-To:  <>
Content-Type: text/plain; charset="us-ascii"

On Oct 16, 3:44 pm, wrote: > I am writing a program which randomly selects predictor variables to > be included in a regression. Since the predictors during any one > iteration can change, I can't write them out in the MODEL statement. > Therefore, I was wondering if there was any way to specify that all > numeric variables in the data set act as regressors? Kind of like > putting _ALL_ or _NUMERIC_ after the equals sign when running PROC REG > (but this approach doesn't work). Any guidance would be greatly > appreciated.

Thanks so much for the suggestions.

At first, I found a solution using IML, but since I've never used that PROC before, I had to canibalize someone's posted IML regression code, and I wasn't terribly comfortable with running something I didn't understand.

I am also embarrassed to say that my experience with macro programs and variables is also limited. However, I was able to work the code below (written by Stuart Long) into the macro I wrote:

data whatever; if 0 then set mydata; length numerics $32767; array num_vars {*} _NUMERIC_ ; do i = 1 TO DIM(num_vars); numerics=CATX( " " , numerics , VNAME(num_vars{i}) ); end; call symputx("regressors",numerics); stop; run; %let dependent = y; %let regressors= %SYSFUNC(TRANWRD(&regressors,&dependent,)); proc reg data=mydata; model &dependent = &regressors ; run; quit;

Finally, thank you Howard and Mary for your suggestions. I have never used DICTIONARY.COLUMNS before, so I will investigate what it does.

Again, thanks so much! - gina

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