/pre>
    <p><code>$apply_measure()</code> allows to apply a measure to an <a href='Idf.html'>Idf</a> and creates
parametric models for analysis. Basically, a measure is just a function that
takes an <a href='Idf.html'>Idf</a> object and other arguments as input, and returns a modified
<a href='Idf.html'>Idf</a> object as output. Use <code>...</code> to supply different arguments to that
measure. Under the hook, <code><a href='https://www.rdocumentation.org/packages/base/topics/mapply'>base::mapply()</a></c