Formula: dd ~ C * diam^b

Parameters:
   Estimate Std. Error t value Pr(>|t|)
C  0.013115   0.006379   2.056    0.288
b -4.715888   2.104701  -2.241    0.267

Residual standard error: 1.146 on 1 degrees of freedom

Number of iterations to convergence: 6 
Achieved convergence tolerance: 1.525e-06