Formula: dd ~ C * diam^b

Parameters:
  Estimate Std. Error t value Pr(>|t|)   
C  0.04822    0.00558   8.641  0.00326 **
b -3.96852    0.33501 -11.846  0.00129 **
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Signif. codes:  0 ‘***’ 0.001 ‘**’ 0.01 ‘*’ 0.05 ‘.’ 0.1 ‘ ’ 1 

Residual standard error: 1.382 on 3 degrees of freedom

Number of iterations to convergence: 5 
Achieved convergence tolerance: 2.214e-06