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Thanks for your help Gareth. I did as you said and it worked!

Hi, My panel database is composed by the daily number of stocks traded (volume) for 139 companies in the past 8 years (2243 days * 139 companies) For each company i need to compute the following indicator: Indicator = log(volume) - log (median(volume(-1 to -20)) . In other words, what i am missing i...