Date:         Wed, 23 Jan 2008 08:07:05 +0800
Reply-To:     "Hu, Jiangtang" <jiangtanghu@GMAIL.COM>
Sender:       "SAS(r) Discussion" <SAS-L@LISTSERV.UGA.EDU>
From:         "Hu, Jiangtang" <jiangtanghu@GMAIL.COM>
Subject:      Re: How to randomly select records from a large data set?
Comments: To: Melodyp <pearsonmelody@gmail.com>
In-Reply-To:  <4f856325-751b-406e-9f7d-e8c5fb9eeb02@s13g2000prd.googlegroups.com>
Content-Type: text/plain; charset=ISO-8859-1

data population;
    do id=1 to 8500;
        j=ranuni(123);
        output;
    end;
run;

/*Random sampling without replacement*/

proc surveyselect data=population out=sample1
                    method=srs rep=1
                     sampsize=1000 seed=123;
      id id j;
run;

/*Random sampling with replacement*/

proc surveyselect data=population out=sample2
                    method=urs  rep=1
                    sampsize=1000 seed=123;
    id id j;
run;

On Jan 22, 2008 4:47 AM, Melodyp <pearsonmelody@gmail.com> wrote:

> Hello! I have a question on how to select about 8500 records from a
> nearly one million records dataset.
>
> The 8500 records must be randomly selected.
>
> Thank you in advance for your help.
>
> Melody
>



--
Jiangtang Hu

Peking University