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Linking WRDS and Datastream

Converting a permno or gvkey id into a company(series)  id valid in Datastream seems to be quite tricky.  See

How can I translate CRSP/Compstat company ids to a Datastream ids?

You have to be quite careful if you have a list of ids that are not all unique.

This method of using both a cusip as an intermediate stage, and some text manuipulation does not seem ideal. If you know of a better method do please leave a comment.

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