Formula: dd ~ C * diam^b

Parameters:
  Estimate Std. Error t value Pr(>|t|)
C  0.05440    0.01732   3.140    0.196
b -3.06434    0.89119  -3.438    0.180

Residual standard error: 3.378 on 1 degrees of freedom

Number of iterations to convergence: 8 
Achieved convergence tolerance: 2.563e-06