Houston, we have a problem!
The NASDAQ Stock Market Trading SessionsRegular Trading Hours from 9:30 a.m. to 4:00 p.m. eastern time
After Hours from 4:00 p.m. to 6:30 p.m. eastern time
http://www.nasdaq.com/about/schedule.stmThe QQQ ETF does not have a "special" open and close time. It is the same as every other listed equity on the Nasdaq.
DTN's own feeds adhere to this because every tick is MarketOpen=false before 09:30 and after 16:00 hours. DTN.IQ Level 2 app. changes to active color at 09:30 and inactive color at 16:00.
My broker's and every other broker's trading system is configured to indicate official market open and market closed that adhere to these times.
Now here it is from the Nasdaq...
Nasdaq Pre-Market Quotes end at 09:29 hours:
http://www.nasdaq.com/?selected=NASDAQ-100+PMINasdaq Pre-Market Trade Report ends at 09:29 hours:
http://quotes.nasdaq.com/quote.dll?mode=frameset&page=afterhours&symbol=QQQ&symbol=&symbol=&symbol=&symbol=&symbol=&symbol=&symbol=&symbol=&symbol=&selected=QQQ&FormType=&kind=&Leap=&mkttype=PRE&sel=premarket&userinput=&x=15&y=9So we have a problem here because how can anyone use the DTN TotalVolume to do some calculations that rely on the actual trading volume - not volume done pre-market or after hours?
VWAP is an obvious problem - anyone calculating VWAP will have an incorrect value. A few bps difference in VWAP is a BIG problem! This way when anyone starts trading at 9:30am they are competing with true the Market Open hours VWAP and not some wild pre-post market trades.
Another problem is inconsistant numbers between snap quotes and aggregated trade tick analysis!
This is a real big pain and such a little oversight by DTN and probably minor to fix.
An obvious fix is to add another field to identify Pre-Market Volume which would clean this up and improve the data quality a lot.
Can you resolve or address this in your next release please?
Otherwise I will have to unnecessarily clean this data in real-time. I don't even want to know the mess and hacking I'm going to start in with cleaning historical data!
Edited by sasha on Oct 27, 2004 at 08:57 PM