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

Parameters:
         Estimate Std. Error t value Pr(>|t|)    
d       1.295e-02  8.331e-02   0.155    0.876    
r1      9.546e-03  4.195e-03   2.276    0.023 *  
kmercov 1.265e+02  1.384e+00  91.461  < 2e-16 ***
bias    0.000e+00  3.337e-01   0.000    1.000    
length  1.024e+06  1.742e+05   5.874 4.98e-09 ***
---
Signif. codes:  0 ‘***’ 0.001 ‘**’ 0.01 ‘*’ 0.05 ‘.’ 0.1 ‘ ’ 1

Residual standard error: 3479000 on 1995 degrees of freedom

Number of iterations to convergence: 23 
Achieved convergence tolerance: 1.49e-08