Formula: dd ~ C * diam^b

Parameters:
   Estimate Std. Error t value Pr(>|t|)    
C  0.031765   0.002466   12.88 0.001010 ** 
b -2.318752   0.129389  -17.92 0.000379 ***
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Signif. codes:  0 ‘***’ 0.001 ‘**’ 0.01 ‘*’ 0.05 ‘.’ 0.1 ‘ ’ 1 

Residual standard error: 0.633 on 3 degrees of freedom

Number of iterations to convergence: 6 
Achieved convergence tolerance: 1.073e-06