topic scaling variable in a dataset? in SAS Procedures

scaling variable in a dataset?

carbs — Tue, 13 Dec 2011 12:49:46 GMT

I'd like to know how to scale a variable between 0&1 in sas. Perhaps it's possible to do with proc stdize somehow?

scaling variable in a dataset?

ballardw — Tue, 13 Dec 2011 15:19:22 GMT

It will be helpful to provide a bit more detail on what you hope to accomplish.

scaling variable in a dataset?

carbs — Tue, 13 Dec 2011 19:02:40 GMT

I simply would like to make the variable vrp scaled between 0&1, the dataset is attached above if it helps..

scaling variable in a dataset?

Reeza — Tue, 13 Dec 2011 20:08:25 GMT

What are the rules for scaling between 0 and 1. How will both 116 and -118 map to the scale from 0 to 1?

You could just use the percentile, but depending on what you're doing that could make absolutely no sense.

scaling variable in a dataset?

carbs — Tue, 13 Dec 2011 20:25:48 GMT

I need the variable vrp for my time-varying regression:

proc reg data=spainbj outest=brittenjonesspain;

model Identity= MKT MKT*lag(vrp) SMB SMB*lag(vrp) HML HML*lag(vrp) MOM MOM*lag(vrp)/noint;

run;

this is a britten-jones regression, where betas are portfolio weights. I use the variable vrp to make the portfolio weights time-varying according to lagged value of vrp. Now I need to scale the variable vrp, in order to get the portfolio weights/betas to change in a rational way. Hope this helps..

scaling variable in a dataset?

Ksharp — Wed, 14 Dec 2011 06:17:38 GMT

you want to standardize this variable to avoid the influence of scale?

proc stdize will help you. Sure there is also a function looks like stdize() to do it.

Ksharp

scaling variable in a dataset?

carbs — Wed, 14 Dec 2011 17:32:30 GMT

Yes! I tried the proc stdize but couldn't get it working. Would someone be able to give me an example on how to proceed with the code here? Thanks in advance.

scaling variable in a dataset?

Rick_SAS — Wed, 14 Dec 2011 18:22:54 GMT

If you want a linear transformation that maps your data to [0,1], use

proc stdize data=MyData out=StdOut method=RANGE;

var vrp;

run;

This maps min(vrp) to 0 and max(vrp) to 1. The transformation is

x --> (x - min(x))/range(x)

http://support.sas.com/documentation/cdl/en/statug/63962/HTML/default/viewer.htm#statug_stdize_sect012.htm

scaling variable in a dataset?

carbs — Wed, 14 Dec 2011 19:37:58 GMT

wow, that was easy! Thanks rick!

scaling variable in a dataset?

carbs — Tue, 31 Jan 2012 10:03:05 GMT

If I'd like to make the linear transformation between -1 and 1, how could that be done? Checked the methods from Rick's link, but none of them seem to fit this idea straight...

scaling variable in a dataset?

Rick_SAS — Tue, 31 Jan 2012 10:42:12 GMT

Run PROC STDIZE with METHOD=RANGE. That creates a variable on [0,1].

Then run a data step that sends x --> 2*x-1. The new range is [-1,1]. For example:

data StdOut;

set StdOut;

vrp = 2*vrp - 1;

run;

scaling variable in a dataset?

carbs — Tue, 31 Jan 2012 20:31:25 GMT

easy again, thanks a million rick!