Formula: dd ~ C * diam^b

Parameters:
   Estimate Std. Error t value Pr(>|t|)  
C  0.018296   0.001868   9.793   0.0648 .
b -0.720836   0.336182  -2.144   0.2778  
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Signif. codes:  0 ‘***’ 0.001 ‘**’ 0.01 ‘*’ 0.05 ‘.’ 0.1 ‘ ’ 1 

Residual standard error: 0.4479 on 1 degrees of freedom

Number of iterations to convergence: 6 
Achieved convergence tolerance: 4.117e-07