topic Re: change random seed in SAS Procedures

change random seed

deleted_user — Thu, 09 Jul 2009 02:12:46 GMT

Hello,

I have a question about changing random seed for every round in the loop.

Say I have a loop:

do i=1 to 1000;

...then in one of the following steps I need to use proc surveyselect which requires me to specify a random seed (e.g., seed=123).

because I need to get different random samples, I want different seed for different i (e.g., seed=123 for i=1, seed=124 for i=2, seed=125 for i=3...).

It seems to me a positive integer should follow the seed= statement. Is there anyway to achieve the above mentioned procedure?

Thank you very much for your help!

sliu

Re: change random seed

DanielSantos — Thu, 09 Jul 2009 14:44:44 GMT

Hello sli.

Anything wrong about not specifying the SEED option and let SAS use the default which is the time of day of the system's clock?

Cheers from Portugal.

Daniel Santos @ www.cgd.pt;

run;

Re: change random seed

deleted_user — Thu, 09 Jul 2009 23:35:47 GMT

Thank you, Daniel!
That's fine for my current purpose. But I would like it to be able to replicate in the future.

Re: change random seed

DanielSantos — Fri, 10 Jul 2009 07:46:24 GMT

OK.

Then you should take a look on macro variables.

Check the online documentation:
http://support.sas.com/documentation/cdl/en/mcrolref/61885/HTML/default/a002293823.htm

Easily accomplished with a macro variable.

Cheers from Portugal.

Daniel Santos @ www.cgd.pt.

Re: change random seed

deleted_user — Fri, 10 Jul 2009 08:32:52 GMT

I will! Thanks!