Formula: dd ~ C * diam^b

Parameters:
   Estimate Std. Error t value Pr(>|t|)
C  0.012159   0.002819   4.313    0.145
b -2.257903   0.778133  -2.902    0.211

Residual standard error: 0.794 on 1 degrees of freedom

Number of iterations to convergence: 6 
Achieved convergence tolerance: 6.687e-06