Red Flag: Why is it so cheap when other data sources are so costly ? Does anyone know the reason? What about their data quality ? On a more basic level, does anyone know how this business of data capturing, organizing and re-selling it to others work ? Assuming any wannable vendor has to first buy the data from exchange (under some contract), and then probably clean/organize it and then sell it - why will different data vendors differ so much in their data cost. Just looking to understand how this data business is run? Thanks for pointers.
if you want accurate results make sure that delisted stocks are also in it. and this particular piece of data is extremely hard to find.
I have done a bit of testing using their data. Cant quantify but the data quality looks good to me. Over the time i have data from IQFeed, my system results match across iqfeed and pitrading. So worked for me. -gariki
Get free daily data from yahoo! and then write an algo to generate random intraday data based on HLC constraints of daily data. Cost you nothing and if your system passes this test then you can spend money to test on a small subset of stocks that will cost you much less.
That's fine, if you're unconcerned about survivorship-bias in your stock universe (as mentioned by Bob).
Absolutely terrible advice. Do not listen to this guy, he doesn't know what he's doing. Do not use yahoo, yahoo daily quotes use open/close values that are not tradeable prices, you will not be consistently filled at those prices. Get your data from a reliable source. Livevol is very good, as is IQ feed, TradeStation also has good data. Why the hell anyone would attempt to generate their own "random" intraday data blows my mind. This person has no idea what they're doing. Reminds me of a well known rule: garbage in = garbage out.