data frame with 437 rows and 28 variables</p><ul><li><p>PID</p></li>
<li><p>county</p></li>
<li><p>state</p></li>
<li><p>area</p></li>
<li><p>poptotal.  Total population</p></li>
<li><p>popdensity. Population density</p></li>
<li><p>popwhite.  Number of whites.</p></li>
<li><p>popblack.  Number of blacks.</p></li>
<li><p>popamerindian.  Number of American Indians.</p></li>
<li><p>popasian.  Number of Asians.</p></li>
<li><p>popother.  Number of other races.</p></li>
<li><p>percwhite.  Percent white.</p></li