015</h2>

<h3>Description</h3>

<p>This data set from Connelly et al. (2017) measures the Arctic sea
ice extent in 10^6 square kilometers. It includes lower bounds and
upper bounds on annual averages.
</p>


<h3>Usage</h3>

<pre><code class='language-R'>arcticseaice
</code></pre>


<h3>Format</h3>

<p>A data frame with 115 observations on the following 4 variables.
</p>

<dl>
<dt><code>year</code></dt><dd><p>the year</p>
</dd>
<dt><code>value</code></dt><dd><p>the annual Arctic sea ice extent (in 10^6 sq km