年度:2000-2019
数据:所有A股上市企业
变量:股票代码,年份,HHI(赫芬达尔-赫希曼指数),CR4(4个最大企业的市场份额率),CR10(10个最大企业的市场份额率)
样例如下:
| stkcd | year | hhi | cr4 | cr10 | 
2  | 2000  | 0.051645  | 0.373856  | 0.568852  | 
2  | 2001  | 0.048963  | 0.359638  | 0.555583  | 
2  | 2002  | 0.044121  | 0.320246  | 0.549767  | 
2  | 2003  | 0.051037  | 0.353674  | 0.573319  | 
2  | 2004  | 0.044628  | 0.319051  | 0.544449  | 
2  | 2005  | 0.058817  | 0.338826  | 0.54012  | 
2  | 2006  | 0.072383  | 0.373813  | 0.569376  | 
2  | 2007  | 0.083734  | 0.420661  | 0.586644  | 
2  | 2008  | 0.081036  | 0.440321  | 0.602983  | 
2  | 2009  | 0.066488  | 0.402196  | 0.561413  | 
2  | 2010  | 0.044344  | 0.344546  | 0.484113  | 
2  | 2011  | 0.052829  | 0.374978  | 0.504246  | 
2  | 2012  | 0.062114  | 0.416263  | 0.553085  | 
2  | 2013  | 0.067034  | 0.424637  | 0.569836  | 
2  | 2014  | 0.065838  | 0.432142  | 0.587839  | 
2  | 2015  | 0.075529  | 0.482124  | 0.619542  | 
2  | 2016  | 0.067921  | 0.454775  | 0.602912  | 
2  | 2017  | 0.068447  | 0.453342  | 0.602212  | 
2  | 2018  | 0.067423  | 0.44683  | 0.614944  | 
2  | 2019  | 0.071762  | 0.458079  | 0.642354  | 
关于行业指数的计算方式可参考链接:
https://wiki.mbalib.com/wiki/%E8 ... 6%E6%8C%87%E6%95%B0