Formula: y_transform ~ x^transform_exp * length * predict2_0(r1, k, d, 
    kmercov, bias, x)

Parameters:
         Estimate Std. Error t value Pr(>|t|)    
d       0.000e+00  8.396e-02   0.000   1.0000    
r1      1.001e-02  4.137e-03   2.419   0.0156 *  
kmercov 1.266e+02  1.351e+00  93.672  < 2e-16 ***
bias    0.000e+00  3.257e-01   0.000   1.0000    
length  9.665e+05  1.610e+05   6.005 2.27e-09 ***
---
Signif. codes:  0 ‘***’ 0.001 ‘**’ 0.01 ‘*’ 0.05 ‘.’ 0.1 ‘ ’ 1

Residual standard error: 3225000 on 1995 degrees of freedom

Number of iterations to convergence: 24 
Achieved convergence tolerance: 1.49e-08