l></div>
    <div class="section level2">
    <h2 id="details">Details<a class="anchor" aria-label="anchor" href="#details"></a></h2>
    <p>The 'frequency' specification uses a Poisson GAM for fitting the
number of claims. The logarithm of the exposure is included as an offset,
such that the expected number of claims is proportional to the exposure.</p>
<p>The 'severity' specification uses a lognormal GAM for fitting the average
cost of a claim. The average cost of a claim is defined as the ratio of the
cl