Formula: dd ~ C * diam^b

Parameters:
   Estimate Std. Error t value Pr(>|t|)   
C  0.069455   0.008017   8.664  0.00323 **
b -2.826862   0.266613 -10.603  0.00179 **
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Signif. codes:  0 ‘***’ 0.001 ‘**’ 0.01 ‘*’ 0.05 ‘.’ 0.1 ‘ ’ 1 

Residual standard error: 1.145 on 3 degrees of freedom

Number of iterations to convergence: 9 
Achieved convergence tolerance: 3.69e-06