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. ... View more