Hi Statalist,
I have a database of a lot of companies for 7 years: 01-2013 to 01-2019. However, in order to calculate certain variables, I first need to be sure the data of every company starts in 01-2013. And the data for some companies start in 2015 for example. Could you please tell me the code to drop all companies that do not start on 01-2013?
Sidenote: I know deleting all companies that don't make it till the end would cause survivorship-bias, but deleting all funds of which there is no data at the beginning of the period will not do any harm right?
Thank you in advance.
Best regards,
Tom Reinders
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