Formula: dd ~ C * diam^b

Parameters:
   Estimate Std. Error t value Pr(>|t|)   
C  0.050871   0.008411   6.048  0.00907 **
b -5.244517   0.628407  -8.346  0.00361 **
---
Signif. codes:  0 ‘***’ 0.001 ‘**’ 0.01 ‘*’ 0.05 ‘.’ 0.1 ‘ ’ 1 

Residual standard error: 1.505 on 3 degrees of freedom

Number of iterations to convergence: 8 
Achieved convergence tolerance: 3.147e-06