h3>

<p>The <code>bigcity</code> data frame has 49 rows and 2 columns. 
</p>
<p>The <code>city</code> data frame has 10 rows and 2 columns.  
</p>
<p>The measurements are the
population (in 1000's) of 49 U.S. cities in 1920 and 1930.  The 49 cities are 
a random sample taken from the 196 largest cities in 1920.  The <code>city</code> data 
frame consists of the first 10 observations in <code>bigcity</code>. 
</p>


<h3>Usage</h3>

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


<h3>Format</h3>

<p>Thi