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This commenter comes into every single thread about trading and talks about buying data from ebay, then consistently demonstrates that he doesn't know the first
by dsacco 9y ago
This commenter comes into every single thread about trading and talks about buying data from ebay, then consistently demonstrates that he doesn't know the first thing about due diligence on financial data. Each time I try to ask him about his data quality or methodology at even a high level, he responds by accusing me of wanting to steal his work or stop the democratization of data.
I'm going to reiterate this right now: you are not going to find data valuable enough for trading insights on ebay. Go look at the prices of historical data for various time resolutions at TickData or CBOE Livevol and then ask yourself if cheap, competitive data on ebay is too good to be true.
If the data is competitive, it's expensive. If it's not competitive, you shouldn't be paying for it, especially not from ebay. The first time I read about him doing this I was puzzled, now I'm getting increasingly frustrated because it's blatantly false information.
- SirLJ 9y agoUnless you are day trading you don't need such a granular data format, so please stop saying you need to spend thousands and thousands of dollars to be able to back test a trading strategy
- dsacco 9y agoIf your data doesn't need to operate on an intraday scale, you can get perfectly accurate real time or historical data for free just by using a reputable broker like Interactive Brokers. At that point there's no need to buy the data on ebay, so I still don't understand why you ever would.
- SirLJ 9y agoActually I have checked IB API and it is very restrictive, e.g. you cannot request let say all daily data for all symbols for 2007 for example or even for one day for that matter...
- lz400 9y agoAs far as I understand historical daily data is easy to get from yahoo, google, etc. Data is only difficult to find/expensive when you need tick data.