幂律分布的参数估计请参考集智百科《幂律分布》http://wiki.swarma.net/index.php/幂律分布和学报《连续型幂律分布的参数估计》https://www.ixueshu.com/document/3750cf6b88dc8b1241a3e775f75f4e16318947a18e7f9386.html