given the model

y = x1 / 1+ b1x2^b2
given data
y<-c(2,3,4,5,6)
x1<- c(0.23,0.32,0.43,0.54,0.65)
x2<-c(0.11,021,0.31,0.41,0.33)
initial parameter
b1=0.023
b2=0.045

i am able to find the parameter of the above model usingnls method,
can u please give hint on how i can solve the same model as above using MM robust estimate to obtain the parameter. i mean u can illustrate using the above information to enable me extend to what i am doing

thanks
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