> Several years ago, someone claimed that CSI retained the data for > these dead companies in their database
they still advertise a delisted stocks database as an optional extra (at a price) brian_z --- In [email protected], "Phsst" <[EMAIL PROTECTED]> wrote: > > I've been with QP EOD for many years now and after looking at several > other data suppliers, I would not change. > > The data integrity is very good. The AB interface is fast. > > There is a caveat that everybody should be aware of however: > > Back at the top of the dot com bubble, QP had over 10K common stocks > in the database. Now there are just over 5500 common stocks in the > database. So as companies come and go, QP drops them from the database. > > Why is this an issue you might ask... > > Removing dead issues from the database results in a psuedo "looking > forward" aspect to your backtesting results. In other words, if failed > companies are removed from your database by the nice folks at QP, then > you are being deprived of seeing how your backtested systems would > have been affected using the data from those failed stocks. > > Several years ago, someone claimed that CSI retained the data for > these dead companies in their database, but over the years I've looked > at CSI and have been disappointed at their charges while not being > convinced about the exact nature of the data they supply. > > > > --- In [email protected], "Howard B" <howardbandy@> wrote: > > > > Greetings all -- > > > > Let me add my voice to those suggesting that you reconsider leaving > Quotes > > Plus. > > > > I am a subscriber to QP for both EOD and RealTime. > > > > I have had difficulties with QP's billing department. Gary got them > > straightened out for me. > > > > I am satisfied with the quality of the data. > > > > Consistency is worth a lot. Most of my research and most of my > trading is > > done based on systems that I have developed using QP data. If I were to > > change to another vendor, I would begin to notice differences. That > would > > concern me, and I would spend way too much time deciding whether I > needed to > > be worried or not. In the end, my choices would be to redo a great > deal of > > research, or go back to QP to resolve the differences. > > > > Thanks, > > Howard >
