[R] Simple linear regression

[Gorazd Brumen]

Dear all,

My friend wants to fit a model of the type

z = a x^n y^m + b,

where x, y, z are data and a, b, n, m are unknown parameters. 

How can he transform this to fit in the linear regression framework? 
Any help would be appreciated.

With regards, 
Gorazd Brumen

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