es with p-values larger than <code>minpv</code>
will not be considered in the next steps (formally, they are removed
from <code>candidates</code>, one of components of class
<code>big</code>). Thanks to that, the whole stepwise procedure will be
much quicker. What is more, <code>reduce_matrix</code> changes the order
of predictors in such a way that at the beginning there will be
variables with the smallest p-values. It is important if you want to use
<code>fast_forward</code> function.</p>
<p>Another probl