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| From | Nick Cox <njcoxstata@gmail.com> |
| To | statalist@hsphsun2.harvard.edu |
| Subject | Re: st: data processing (daily to yearly) |
| Date | Tue, 5 Apr 2011 08:10:55 +0100 |
Sounds like homework. Statalist does not encourage students to get others to do their assignments for them. See the FAQ. On Tue, Apr 5, 2011 at 1:15 AM, Arlene Young (yi yang <yangyi.1122@yahoo.com.cn>) wrote: > We have met a data processing problem. > > We now have a series of daily trading data for all stocks listed from year 2000 to 2011. Our assignments are: > > (1) For each stock, keep only the data on the last trading day of each year; > > (2) For each year, accumulate the daily trading data of single stock as to obtain the mean value as the final trading data of this stock. > > As to the first requirement, we find it hard to locate the last trading day of each year, since it may be December 31th, or December 29,th or else. > > As to the second requirement, we have no idea which function or order to use as to accumulate the daily data, and finally count the mean value. > > Could anyone kindly help us to locate the target record, or to tell us how to compute the mean value? > > Thank you and best wishes! * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/