I have fitted a model

```
using DataFrames
df = DataFrame(
x = 2*y + 1 + rand(100),
y = rand(100)
)
using GLM
mdl = lm(@formula(y~x), df)
```

now I can see the pvalues of the coefficients. How do I obtain the pvalues and set them to a variable?

The output from above

```
Formula: y ~ 1 + x
Coefficients:
Estimate Std.Error t value Pr(>|t|)
(Intercept) 1.46518 0.0514909 28.4552 <1e-48
x 2.08846 0.0889749 23.4724 <1e-41
```