topic Re: Find if NLIN failed to converge in Statistical Procedures

Find if NLIN failed to converge

PaalNavestad — Mon, 18 May 2020 10:49:11 GMT

Hi, I'm coding a work flow where I first try to find a decline curve using Nlin. Some by groups has bad data or do not follow a decline. I can see this from the fact that the procedure does not Converge. I can use non-convergence as flag to call different methods. Basically I just want a way to programmatically see the fact that this text is put to the output/log

WARNING: PROC NLIN failed to converge.

I would rather not have to read the log/output as text if possible.

Does anybody know of a macro/method to test for this in an easy manner?

Re: Find if NLIN failed to converge

Ksharp — Mon, 18 May 2020 12:10:14 GMT

You could try option
proc nlin outest=

And you need a good initial value for parameters.
@Rick_SAS wrote a blog about it before .

Re: Find if NLIN failed to converge

Rick_SAS — Mon, 18 May 2020 14:26:26 GMT

This article describes two methods for monitoring the convergence status of many SAS procedures, including NLIN: "Monitor convergence during simulation studies in SAS."

Re: Find if NLIN failed to converge

PaalNavestad — Mon, 18 May 2020 14:56:44 GMT

Thanks, Yes the outest has the data.

Re: Find if NLIN failed to converge

PaalNavestad — Mon, 18 May 2020 14:58:47 GMT

Thanks,