Formula: dd ~ C * diam^b

Parameters:
   Estimate Std. Error t value Pr(>|t|)   
C  0.013375   0.002657   5.034   0.0151 * 
b -4.101112   0.572562  -7.163   0.0056 **
---
Signif. codes:  0 ‘***’ 0.001 ‘**’ 0.01 ‘*’ 0.05 ‘.’ 0.1 ‘ ’ 1 

Residual standard error: 0.9101 on 3 degrees of freedom

Number of iterations to convergence: 7 
Achieved convergence tolerance: 8.441e-06