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st: data management
From
Luo Di <[email protected]>
To
[email protected]
Subject
st: data management
Date
Fri, 4 Mar 2011 12:42:44 +0000
Dear,
I have some monthly stock returns from the period of 31jan1947 to
31dec2010. But some stocks donot have such a long period span. I only
want to have stocks over the periods of 31jan1947 to 31dec2010. How
can I do that? Could I use drop or joinby?
Many thanks!!!
Best Regards,
Luo Di
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