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"Just a quick one to say I'm very impressed so far :) The documentation for developers is excellent and I've quickly managed to get an app written to do historical downloads. The system is very robust and pretty quick considering the extent of data that's available. The support guys have been very helpful too, in combination with the forums it's been plain sailing so far!" - Comment from Adam
"DTN feed was the only feed that consistently matched Bloomberg feed for BID/ASK data verification work these past years......DTN feed is a must for my supply & demand based trading using Cumulative Delta" - Comment from Public Forum Post
"There is no doubt that IQFeed is the best data provider. I am very satisfied with your services. And IQFeed is the only one that I would recommend to my friends. Now, most of them are using your product in China." - Comment from Zhezhe
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Viewing User Profile for: PaulSawyer
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Joined: May 12, 2014 06:45 PM
Last Post: May 13, 2014 12:39 PM
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PaulSawyer has contributed to 2 posts out of 21196 total posts (0.01%) in 3,661 days (0.00 posts per day).

20 Most recent posts:
IQFeed Datafeed Wish List » Please add quotes to historical tick data, now it only provides trades May 13, 2014 12:39 PM (Total replies: 8)

You could cut down on band width requirements using compression. I store all of my tick data using a simple compression system that yields on average around five to one compression. I am sure that other compression systems would give even greater compression. My system allows me to also keep data sets compressed in RAM and decompress them on the fly while I back test. It does require me to store ask, bid and trades in separate files but that should work well for your business as well.
Paul Sawyer

IQFeed Datafeed Wish List » Please add quotes to historical tick data, now it only provides trades May 12, 2014 07:14 PM (Total replies: 8)

I also just signed up for IQFeed and I am disappointed to find that you don't provide all bid ask quotes in the historical tick data. My old vendor provide one week of past bid ask tick data which worked well for me. That would not require a lot of additional storage to provide. It does require about five times the bandwidth over the trade only ticks. I would suggest only making it available when the markets are closed. I need those prices. I may have to go back to my old vendor.
Paul Sawyer


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