or" id="format"><a class="anchor" href="#format"></a>Format</h2>

    <p>A list object with 3 elements:</p><dl>
  <dt>X</dt><dd><p>per capita GRP(yuan)</p></dd>
  <dt>Y</dt><dd><p>Level of urbanization percent</p></dd>
  <dt>M</dt><dd><p>Railway Distance (km) matrix of 29 Chinese regions</p></dd>

</dl>

    <h2 class="hasAnchor" id="source"><a class="anchor" href="#source"></a>Source</h2>

    <p><a href='https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0126158'>https://journals.plos.org/p