Formula: dd ~ C * diam^b

Parameters:
  Estimate Std. Error t value Pr(>|t|)   
C  0.02854    0.00364   7.839  0.00432 **
b -3.83790    0.42301  -9.073  0.00283 **
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Signif. codes:  0 ‘***’ 0.001 ‘**’ 0.01 ‘*’ 0.05 ‘.’ 0.1 ‘ ’ 1 

Residual standard error: 0.9826 on 3 degrees of freedom

Number of iterations to convergence: 9 
Achieved convergence tolerance: 3.608e-06