lphypc:</strong> change in lphypc</p></li>
<li><p><strong>lpopul:</strong> log(popul)</p></li>
<li><p><strong>clpopul:</strong> change in lpopul</p></li>
</ul></div>
    <div id="source">
    <h2>Source</h2>
    <p><a href="https://www.cengage.com/cgi-wadsworth/course_products_wp.pl?fid=M20b&amp;product_isbn_issn=9781111531041" class="external-link">https://www.cengage.com/cgi-wadsworth/course_products_wp.pl?fid=M20b&amp;product_isbn_issn=9781111531041</a></p>
    </div>
    <div id="notes">
    <h2>Notes</