on level2">
<h2 id="the-univariate-case-sea-level">The Univariate Case (Sea Level)<a class="anchor" aria-label="anchor" href="#the-univariate-case-sea-level"></a>
</h2>
<p>The following code graphs a built-in dataset of sea-level time
series. The top panel provides an overview of the entire data set. The
second panel is narrowed to the most recent month, which should reveal
spring-neap cycles if the tide is mixed. The third panel is a log
spectrum, with a few tidal constituents indicated. The
<code>section<