ass='input'>
<span class='fu'>data</span>(<span class='no'>greenland</span>)
<span class='no'>model</span> <span class='kw'>&lt;-</span> <span class='fu'>lm</span>(<span class='no'>airtemp</span> ~ <span class='no'>year</span>, <span class='kw'>data</span><span class='kw'>=</span><span class='no'>greenland</span>)
<span class='fu'>plot</span>(<span class='no'>greenland</span>$<span class='no'>year</span>, <span class='no'>greenland</span>$<span class='no'>airtemp</span>, <span class='kw'>xlab</span><span cl