Date:         Thu, 13 Jul 2006 10:17:47 -0400
Reply-To:     "Howard Schreier <hs AT dc-sug DOT org>" <nospam@HOWLES.COM>
Sender:       "SAS(r) Discussion" <SAS-L@LISTSERV.UGA.EDU>
From:         "Howard Schreier <hs AT dc-sug DOT org>" <nospam@HOWLES.COM>
Subject:      Re: How to create Chaos data

There's no need for the LAG function in this case. Try:

   data chaos;
   y = 0.01;
   do t = 0 to 9;
      Y = 4 * Y * (1-Y);
      output;
      end;
   run;

On Wed, 12 Jul 2006 20:26:29 -0700, kiki <roki@XMU.EDU.CN> wrote:

>For example, consider a chaotic logistic map:
>
>Yt = 4*lag(Yt)*(1-lag(Yt));     t = 0; 1; 2; :::;
>
>how can I create a serial data with such chatic logistic.
>
>such as
>Yt-1=0.01
>Yt=0.039
>Yt+1=0.1521
>.....
>
>
>
>Thanks