How to simulate diffusion process with certain line pattern ?!

[hellohere]

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

[Ksharp]

I am not sure.

There are a couple of Basic Time Series Subroutines in SAS/IML . Maybe you could check it.

Or @Rick_SAS  could help you something.

[hellohere]

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.