Formula: dd ~ C * diam^b

Parameters:
   Estimate Std. Error t value Pr(>|t|)
C  0.004484   0.003881   1.155    0.454
b -8.192802   3.199812  -2.560    0.237

Residual standard error: 1.128 on 1 degrees of freedom

Number of iterations to convergence: 6 
Achieved convergence tolerance: 2.338e-06