Formula: dd ~ C * diam^b

Parameters:
   Estimate Std. Error t value Pr(>|t|)
C  0.016041   0.008018   2.001    0.295
b -4.020433   1.661850  -2.419    0.250

Residual standard error: 1.971 on 1 degrees of freedom

Number of iterations to convergence: 6 
Achieved convergence tolerance: 6.63e-06