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How does Interactive Broker's historical data compare to other alternatives?

Has any of you stumbled with shows stopper problems like it having survivorship bias?
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EOD Options data provider - optiondata.net

Does anyone have any experience with optiondata.net as data provider for EOD options data? How would they be compared to historicaloptiondata.com?
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CME historical option data provider

Is there any other historical end-of-day CME option data provider rather then CME DataMine? I've searched all the internet and found only CBOE traded options.
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How to make a historical index of a group of materials in which the set of materials changes every month?

The question may sound simple however for the moment it is a brainteaser to get it right, let me explain: the exercise is to be done on +/- 200 groups of materials (matgroups) one matgroup can ...
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Where do “Forex economic calendars” get their data?

Where do all these "Forex economic calendars" get their data from? http://www.fxstreet.com/fundamental/economic-calendar/ http://www.forexfactory.com/calendar.php http://www.dailyfx.com/calendar ...