EOD data accuracy is "NOT" important "IF" your indicator is calculating in such a way that it looks for the core value of the action of the data for the last several hundred days of activity. In this case, you could have many errors, and the errors would be overwhelmed by the consensus opinion of the hundreds of days of the largely correct data. Ron D.
brian_z111 <[EMAIL PROTECTED]> wrote: Thanks Bill, The problem I have with that article is that they don't say what method they used to measure the error rate. I think that in the financial journals etc there would be reports on the efforts of academics to deal with the issue but would I personally have the resources and expertise to do it myself. Since the data from the exchanges contains errors, and their books are closed, how could anyone know for sure how accurate the data is? brian_z --- In [email protected], "wavemechanic" wrote: > > Here is one study: http://www.csidata.com/csi/reviews/reprintsep99.html > > Bill > > ----- Original Message ----- > From: "brian_z111" > To: > Sent: Friday, February 15, 2008 12:35 PM > Subject: [amibroker] Re: AP's RT data feed - for MarkK > > > > Steve, > > > > I would like to know how I can decide if EOD data is clean or if > > intraday data is up to the demands. > > > > It is a subject that I don't see much quality discussion on. > > > > For EOD data my best ideas so far are: > > > > 1) Data includes raw data - I can compare raw data to other providers > > raw data - I can't compare it to an absolute benchmark because there > > isn't one. > > > > 2) Data inlcudes a record of all split events and the corresponding > > split factor I can check the event records independently and check > > the math. > > > > 3) I can apply the split factor or see the results of it's > > application so I can check the math. > > > > 4) The event calendar should inlcude non-trading days for the market > > and stand down trading days for companies. > > > > 5) Data can be padded or unpadded (optional). > > > > I can't think of any other way to measure data quality. > > > > I don't think any data provider meets the criteria - maybe a few. > > > > > > For intraday: > > > > What could I possibly do? > > > > Buy raw tick data from several providers, compare them for a > > consensus and filter it myself ? > > > > I am at a loss on that one. > > > > Of course another option is to trade in such a way that bad ticks and > > unclean EOD data don't affect the outcomes very much (that could be a > > lot easier than the above). > > > > brian_z > > > > --- In [email protected], "scourt2000" wrote: > >> > >> > >> Mark, > >> > >> No successful intraday real-time trader who does this full-time > > would > >> ever drop eSignal for Gary's new real-time service. > >> > >> It's a pennywise and pound-foolish decision. > >> > >> He's fine for clean end-of-day data. But he's way out of his > > league > >> for the demands of intraday real-time trading. > >> > >> > >> --- In [email protected], "MarkK" wrote: > >> > > >> > Brian, > >> > > >> > > >> > > >> > So far I am very happy with the QP RT beta testing > >> > > >> > I believe that when it goes live they will be taking a lot of > >> customers away > >> > from the other services > >> > > >> > > >> > > >> > It is a much better value than other things out there, and so far > >> the data > >> > has been accurate > >> > > >> > > >> > > >> > > >> > > >> > MarkK > >> > > >> > > >> > > >> > _____ > >> > > >> > From: [email protected] > > [mailto:[EMAIL PROTECTED] > >> On Behalf > >> > Of brian_z111 > >> > Sent: Friday, February 15, 2008 7:47 AM > >> > To: [email protected] > >> > Subject: [amibroker] Re: AP's RT data feed - for MarkK > >> > > >> > > >> > > >> > > I am looking for an RT data provider. I used eSignal for a > > couple > >> > >of years, then quit and am ready to resart, but don't likr their > >> > >fees. > >> > > >> > QuoteTracker and LiveCharts have the $60 and $20 version of > > eSignal > >> > if you don't mind less backfill and fewer symbols. > >> > > >> > I have read of a few issues with LiveCharts but surely we can > > make > >> it > >> > work (a lot of the problems also came about because people still > >> > wanted it free after it changed to pay for play a year ago - of > >> > course it doesn't work if ou don't pay). > >> > > >> > A couple of users said it was slow - I don't know - I haven't > > tried > >> > it yet but I will. > >> > > >> > brian_z > >> > > >> > --- In [EMAIL PROTECTED] 40yahoogroups.com> > >> ps.com, "Ara > >> > Kaloustian" wrote: > >> > > > >> > > Mark, > >> > > > >> > > I am looking for an RT data provider. I used eSignal for a > > couple > >> > of years, then quit and am ready to resart, but don't likr their > >> fees. > >> > > > >> > > Would you elaborate a bit on AP. Never heard of them > >> > > > >> > > Tx > >> > > > >> > > Ara > >> > > ----- Original Message ----- > >> > > From: MarkK > >> > > To: [EMAIL PROTECTED] > >> ps.com > >> > > Sent: Friday, February 15, 2008 3:36 AM > >> > > Subject: RE: [amibroker] New EOD data feed other than Quotes > > Plus > >> > > > >> > > > >> > > Dan, > >> > > > >> > > > >> > > > >> > > I use QP for EOD data, and am happy with the fundamental data > >> > that they provide. Not sure there is another service that offers > > as > >> > much in that area > >> > > > >> > > I also use Fast Track for EOD data. Some market internal data, > >> > no fundamental data to speak of, however the data has been > > cleaner > >> > than QP EOD day data. For Mutual fund data not sure there is a > >> > better service out there. > >> > > > >> > > > >> > > > >> > > Have been an e-signal subscriber for RT data now for 4 years. I > >> > cancelled my subscription since they kept raising their prices, > > and > >> > went to IQ feed. Used them for a month then they raised their > >> > prices. Luckily I was abe to beta test AP's RT data feed. So far > >> > they have been very responsive on the changed needed to make it > > an > >> > excellent RT service, and at a reasonable price. > >> > > > >> > > > >> > > > >> > > I would suggest you get hold of Gary at QP and let him know > > about > >> > your issue. I would think you will become a satisfied customer > > once > >> > again > >> > > > >> > > > >> > > > >> > > > >> > > > >> > > > >> > > > >> > > MarkK > >> > > > >> > > > >> > > > >> > > > >> > > ---------------------------------------------------------- > >> > ---------- > >> > > > >> > > From: [EMAIL PROTECTED] 40yahoogroups.com> > >> ps.com > >> > [mailto:[EMAIL PROTECTED] 40yahoogroups.com> > >> ps.com] On > >> > Behalf Of Dan Clark > >> > > Sent: Thursday, February 14, 2008 11:56 PM > >> > > To: [EMAIL PROTECTED] > >> ps.com > >> > > Subject: [amibroker] New EOD data feed other than Quotes Plus > >> > > > >> > > > >> > > > >> > > I've been using Quotes Plus data for the last 2-1/2 years. > >> > Overall, I've been very happy with Quotes Plus data and Gary > >> Lyben's > >> > (owner/president) responsiveness. That said. > >> > > > >> > > > >> > > > >> > > In the last few days, I've swapped several e-mails about a > > minor > >> > billing issue (credit card renewed with different number) with a > >> > woman in his billing department. What should have been a very > > minor > >> > clerical issue left me feeling EXTREMELY angry and offended. > >> > > > >> > > > >> > > > >> > > I vowed to switch my data feed from Quotes Plus to another data > >> > feed as soon as possible. This is a major issue for me because of > >> > the amount of AFL recoding involved, but I can no longer do > >> business > >> > with Quotes Plus. > >> > > > >> > > > >> > > > >> > > I need some options for other EOD data feeds. What EOD service > >> > are you using? What has your experience been? What are the > >> > alternatives now? > >> > > > >> > > > >> > > > >> > > Thanks and regards, > >> > > > >> > > > >> > > > >> > > Dan. > >> > > > >> > > >> > > > > > > > > > > Please note that this group is for discussion between users only. > > > > To get support from AmiBroker please send an e-mail directly to > > SUPPORT {at} amibroker.com > > > > For NEW RELEASE ANNOUNCEMENTS and other news always check DEVLOG: > > http://www.amibroker.com/devlog/ > > > > For other support material please check also: > > http://www.amibroker.com/support.html > > > > Yahoo! Groups Links > > > > > > > > > > > > -- > > No virus found in this incoming message. > > Checked by AVG Free Edition. > > Version: 7.5.516 / Virus Database: 269.20.4/1277 - Release Date: 2/13/2008 8:00 PM > > > > > Please note that this group is for discussion between users only. To get support from AmiBroker please send an e-mail directly to SUPPORT {at} amibroker.com For NEW RELEASE ANNOUNCEMENTS and other news always check DEVLOG: http://www.amibroker.com/devlog/ For other support material please check also: http://www.amibroker.com/support.html Yahoo! Groups Links
