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OpenSourceAP / CrossSection

Code to accompany our paper Chen and Zimmermann (2020), "Open source cross-sectional asset pricing"
https://papers.ssrn.com/sol3/papers.cfm?abstract_id=3604626
GNU General Public License v2.0
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Use of permno for stock identification is not open (as far as I can tell) #74

Closed colintbowers closed 2 years ago

colintbowers commented 2 years ago

Hi. This paper/code/data is a wonderful idea, so thanks for your work on it. I thought I'd file this issue to raise the point that CRSP permno is not an open standard (I don't think), so anyone whose institution does not have a subscription (my own only has Refinitiv) will be unable to use your individual security data, given that it appears to use permno as the identifier, rather than an open standard (such as CUSIP). It is possible that using permno's was a condition of publication of the data. If so, I perfectly understand that your hands are tied and that is that. But I thought I'd check, just in case :-)

EDIT: If allowed, an additional csv file mapping permno to cusip for the securities in question would deal with this

Cheers,

Colin

chenandrewy commented 2 years ago

@colintbowers, thanks for the comment. There are certainly limits to open source data, and I think this is one of them. I wouldn't feel comfortable posting security link tables.

colintbowers commented 2 years ago

Fair enough @chenandrewy. Thanks for taking the time to respond. Cheers -Colin