Q: How to find unique obs in Compustat?
A: DATAFMT = STD INDFMT = INDL CONSOL = C POPSRC = D
web:
https://cobweb.business.nd.edu/Portals/0/MendozaIT/Research/Shared%20Documents/CCM/Data%20Guides/CRSP-Compustat%20Merged%20Database%20Guide.pdf
page 11
问了力力，他说，看似是对的。就是keyset=0的那一行。找一个WRDS的sample program来看看。
我找了以下的。应该是对的。
http://wrds-web.wharton.upenn.edu/wrds/support/Data/_003Sample%20Programs/Compustat/compna_funda1.cfm
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