What syntax to use to implement a power function into procedure NLMIXED (SAS 9.4)

[DanBrug]

Hello,

I want to fit a power function (e.g. y = ax^b) using the NLMIXED procedure. Unfortunately, I don´t know (and also did not find any hints, yet) whether or how the syntax for a power function works within the model statement of the NLMIXED procedure. Let´s assume the following model statement:

model y~ Normal (a*x^b, errvar);   The bold part of the term (^b) obviously does not work to introduce the power of b to x. 

Can anyone help me on this? Is this possible at all?

Thank you very much in advance!

D.B.

[andreas_lds · Accepted solution]

Instead of ^ try **, works in a data-step:

26         data _null_;
27            a = 4 ** 2;
28            put a=;
29         run;

a=16

[DanBrug]

Thank you so much!

This worked quite well!

Regards,

Daniel.