数据结构如下
input long stkcd int year float(Δacco ΔCFO)
2 2008 -.3090124 .2148343
2 2009 -.06869491 .07794617
2 2010 .0749478 -.06134686
2 2011 -.01279954 -.0005399585
2 2012 .0009788461 -.003139315
2 2013 .0006075762 -.00750001
2 2014 -.09391301 .08199203
2 2015 .06853287 -.0555096
2 2016 -.03447585 .033163782
2 2017 -.03704573 .034378596
4 2008 -.05628811 .04243891
4 2009 -.15788975 .26925993
4 2010 .3853872 -.3285901
4 2011 -.1960037 .1560428
4 2012 .01971974 -.01565773
4 2013 .1867557 -.19854183
4 2014 -.13005705 .08622274
4 2015 -.035981238 .05023271
4 2016 -.24427193 .3436758
4 2017 .2164631 -.3065112
end
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