et
the model. It can be crucial if you have big data.</p>
</div>
<div id="big-data" class="section level2">
<h2>Big data</h2>
<p>Now, let consider data which is larger than RAM you have in your
computer. It is impossible to read it in a normal way, but in a process
of building regression model it is not necessary to have access to all
predictors at the same time. Instead, you can read only a part of the
matrix <code>X</code>, check all variables from that part and then read
another one. To do that, you only