Formula: dd ~ C * diam^b

Parameters:
   Estimate Std. Error t value Pr(>|t|)    
C  0.049796   0.002309   21.57 0.000218 ***
b -2.696448   0.084201  -32.02 6.69e-05 ***
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Signif. codes:  0 ‘***’ 0.001 ‘**’ 0.01 ‘*’ 0.05 ‘.’ 0.1 ‘ ’ 1 

Residual standard error: 0.4064 on 3 degrees of freedom

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