Formula: dd ~ C * diam^b

Parameters:
   Estimate Std. Error t value Pr(>|t|)    
C  0.065659   0.004503   14.58 0.000700 ***
b -2.941539   0.148926  -19.75 0.000284 ***
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Signif. codes:  0 ‘***’ 0.001 ‘**’ 0.01 ‘*’ 0.05 ‘.’ 0.1 ‘ ’ 1 

Residual standard error: 0.486 on 3 degrees of freedom

Number of iterations to convergence: 4 
Achieved convergence tolerance: 5.27e-06