https://communities.sas.com/t5/SAS-Forecasting-and-Econometrics/How-to-simulate-diffusion-process-with-certain-line-pattern/m-p/977698#M5015 Thanks. It is for simulation not for forecasting. Learned many years ago, []/cos(x) or alike. But never use and total free from brain now. Fri, 24 Oct 2025 02:23:15 GMT hellohere 2025-10-24T02:23:15Z https://communities.sas.com/t5/SAS-Forecasting-and-Econometrics/How-to-simulate-diffusion-process-with-certain-line-pattern/m-p/977694#M5013 <P>I have the time-series information, [time=ind, y=index]. Dataset attached. How to similuate diffusiton process with the y/index pattern[any para is fine as long as diffusion]? Thanks</P> Thu, 23 Oct 2025 23:36:50 GMT https://communities.sas.com/t5/SAS-Forecasting-and-Econometrics/How-to-simulate-diffusion-process-with-certain-line-pattern/m-p/977694#M5013 hellohere 2025-10-23T23:36:50Z https://communities.sas.com/t5/SAS-Forecasting-and-Econometrics/How-to-simulate-diffusion-process-with-certain-line-pattern/m-p/977697#M5014 <P>I am not sure.</P> <P>There are a couple of&nbsp;Basic Time Series Subroutines in SAS/IML . Maybe you could check it.</P> <P>Or&nbsp;<a href="https://communities.sas.com/t5/user/viewprofilepage/user-id/13684">@Rick_SAS</a>&nbsp; could help you something.</P> <P>&nbsp;</P> <P><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="Ksharp_0-1761270641663.png" style="width: 400px;"><img src="https://communities.sas.com/t5/image/serverpage/image-id/110882iC7D0681E575EC388/image-size/medium?v=v2&amp;px=400" role="button" title="Ksharp_0-1761270641663.png" alt="Ksharp_0-1761270641663.png" /></span></P> <P>&nbsp;</P> Fri, 24 Oct 2025 01:50:46 GMT https://communities.sas.com/t5/SAS-Forecasting-and-Econometrics/How-to-simulate-diffusion-process-with-certain-line-pattern/m-p/977697#M5014 Ksharp 2025-10-24T01:50:46Z https://communities.sas.com/t5/SAS-Forecasting-and-Econometrics/How-to-simulate-diffusion-process-with-certain-line-pattern/m-p/977698#M5015 Thanks. It is for simulation not for forecasting. Learned many years ago, []/cos(x) or alike. But never use and total free from brain now. Fri, 24 Oct 2025 02:23:15 GMT https://communities.sas.com/t5/SAS-Forecasting-and-Econometrics/How-to-simulate-diffusion-process-with-certain-line-pattern/m-p/977698#M5015 hellohere 2025-10-24T02:23:15Z https://communities.sas.com/t5/SAS-Forecasting-and-Econometrics/How-to-simulate-diffusion-process-with-certain-line-pattern/m-p/982362#M5020 <P>&nbsp;<a href="https://communities.sas.com/t5/user/viewprofilepage/user-id/409584">@hellohere</a>&nbsp;,</P> <P>I am not sure what specific equation you have in mind, but if you can write out your equation for the process, you may use the <A href="https://go.documentation.sas.com/doc/en/pgmsascdc/v_071/etsug/etsug_model_sect056.htm" target="_self">SOLVE</A> statement in <A href="https://go.documentation.sas.com/doc/en/pgmsascdc/v_071/etsug/etsug_model_toc.htm" target="_self">PROC MODEL</A> to simulate the process. Hope that helps.</P> Fri, 23 Jan 2026 14:39:59 GMT https://communities.sas.com/t5/SAS-Forecasting-and-Econometrics/How-to-simulate-diffusion-process-with-certain-line-pattern/m-p/982362#M5020 SASCom1 2026-01-23T14:39:59Z