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OmniTrader Archives OmniTrader 2015 Technical Support Omnidata Data Integrity		Last Activity 12/22/2017 11:03 PM 10 replies, 2653 viewings

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GaryM

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Subject : Omnidata Data Integrity
Posted : 12/17/2014 7:37 PM
Post #33961

I do lots of EOD simulations going back years and have noticed that the integrity of OmniData is very questionable. When companies split their stock, are bought out, merge, or change stock symbols, this information is not accurately reflected in the OmniData stock pricings. This is easily identified by noticing when a historic price has dipped below zero. [cases where the historical pricing had not dipped below zero are much harder to identify the errors.] A simulation review/analysis is only as good as the data used for it. IQFeed does a much better job of checking their historical stock pricings (and correcting them when needed); however, their service is also much more expensive. Check out the following symbols as an example of what I am referring to....AAPL, ABV, ALTR, AMAT, AMT, BBEP, BHP, C, CAT...and many, many, more. Thank you Nirvana Support for any help you can provide in ensuring that the OmniData stock prices we are paying for are historically accurate.

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Barry Cohen

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Subject : RE: Omnidata Data Integrity
Posted : 12/18/2014 10:48 AM
Post #33966 - In reply to #33961

We make data corrections any time they are submitted to us, usually on the same day. If you have a data correction that needs to be made, you may do so any time. But please check this FAQ to make sure it's actually a data issue.

But given what you said, I checked AAPL & CAT daily data back to 1990. OmniData, eSignal, TC2000, & IQ Feed are all nearly identical. So maybe the data that you are seeing isn't updating historical changes properly. You could try reinstalling OmniData by uninstalling it & reinstalling it here.

Although maybe you're referring to how OmniTrader displays splits, dividends, symbol changes, etc. If that's the case then yes, as we haven't really addressed that in OmniTrader very well.

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GaryM

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Subject : RE: Omnidata Data Integrity
Posted : 12/19/2014 5:13 AM
Post #33972 - In reply to #33961

In my program files, I show three possible files that I could delete and then reload OmniData. They are "Nirvana RT Data" from July 2013, "Nirvana RT Data" from Dec 2014, and "OmniScan" from Dec 2014. Which of these files do I need to delete before installing OmniData from the link you sent earlier? Thank you.

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Barry Cohen

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Subject : RE: Omnidata Data Integrity
Posted : 12/19/2014 10:28 AM
Post #33973 - In reply to #33972

OmniScan.

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GaryM

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Subject : RE: Omnidata Data Integrity
Posted : 12/19/2014 3:23 PM
Post #33982 - In reply to #33973

Barry- You mentioned that the chart of AAPL from the three data sources looked the same, but didn't mention whether historical data dropped below $0 in price at any time. I uninstalled and reinstalled OmniData and still have the same issue. I am attaching the AAPL chart that shows that prior to mid-2009 the price dipped below zero dollars and from Jan 2008 and everything earlier it stayed below Zero $$$ and even shows to be as low as $-20 for everything prior to 2005. Are you showing these negative values also? Is that a concern for using such data in simulations? Thanks for any help you can provide.

Attached file : AAPL.pdf (47KB - 453 downloads)

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Barry Cohen

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Subject : RE: Omnidata Data Integrity
Posted : 12/19/2014 4:00 PM
Post #33983 - In reply to #33982

None of the data I have seen drops below zero. Since it's not OmniData, it must be something else. Try this...

Close OmniTrader. In the C:\Program Files\Nirvana\Data folder, delete any instance of Exchangeinfo & Symbols32, then restart OmniTrader. It will recreate new versions of those database files.

Try AAPL afterwards. If it still shows negative values, right-click the chart & select Reload Data & see if that helps now.

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GaryM

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Subject : RE: Omnidata Data Integrity
Posted : 12/21/2014 8:38 AM
Post #33987 - In reply to #33961

I tried the suggestion you gave and still get the negative values. If I am downloading the same data, then I cannot see why my numbers are negative if yours are not. Thoughts? Thank you.

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SteveL

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Subject : RE: Omnidata Data Integrity
Posted : 12/21/2014 8:57 AM
Post #33988 - In reply to #33987

Gary,

Strictly a guess, but what do you have set in Edit->DataSettings->Advanced->EasyData->Stocks tab "Easy Data Settings & Preferences"?

[Edited by SteveL on 12/21/2014 8:58 AM]

Attached file : 2014-12-21_7-55-49.png (12KB - 646 downloads)

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GaryM

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Subject : RE: Omnidata Data Integrity
Posted : 12/24/2014 5:24 AM
Post #35015 - In reply to #33988

I have all three of the boxes on the screen you captured below checked. It used to be that I would Delete All Data for a bad chart and then double-click on the symbol to refresh it and all would be well. That has not worked for me for a couple of years. Thanks for the suggestion. Any other ideas?

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SteveL

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Subject : RE: Omnidata Data Integrity
Posted : 12/24/2014 9:07 AM
Post #35017 - In reply to #35015

Barry,
How are dividends handled? Do the dividend calculations take splits into account?

Gary,
I only have the one box checked. I suggest you try checking just the one box, delete the data, and reload the data. Also, a logarithmic scale would enable seeing better what is happening at the low end.

On a suspicion that perhaps the dividend data isn't being adjusted to account for splits, I looked at AAPL's dividend history. The dividend total seems suspiciously similar to your "negative" values.

[Edited by SteveL on 12/24/2014 9:08 AM]

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GaryM

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Subject : RE: Omnidata Data Integrity
Posted : 12/26/2014 2:34 PM
Post #35024 - In reply to #35017

I unchecked the box for Automatic Dividend Adjustment and all is well. Not sure how accurately dividends are reflected since checking the box causes history to "go negative". IMHO this check box should at least be eliminated until the issue is resolved. Many thanks to all.

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