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I've noticed a small but significant issue with anaCurrentDayVWAPV38. If I compare it to GomMP VWAP, it generally produces the same result, however, it seems to draw it slightly off so that price action doesn't exactly respect the visual level. The following are not isolated incidents but rather occur often, albeit at a small level.
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Note the prices are the same, but the visual levels are not.
Another example:
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Can anything be done to fix this small discrepancy. Otherwise, sometimes it appears that price has crossed the anaVWAP when it hasn't or vice versa.
Know The Rules Well So You Can Break Them Effectively
How did you conclude that the anaCurrentDayVWAP is slightly off and not the GomMPVWAP?
If you are within the session and price action continues, the VWAP cannot be a horizontal line, but it must follow price action. That is if prices are above the VWAP, the VWAP should rise and if prices are below the VWAP, the VWAP should fall. In any case it cannot be stable during the session.
Depending on the data used for calculating a VWAP there can be a slight inaccuracy. The correct VWAP can only be calculated from tick-by-tick data by using every single trade. The anaCurrentDayVWAP38 uses an approximation for calculating the average price, as it cannot access the 1-tick data series, but only the bars on the chart. I do not know what type of bars you use, because you have not shown it. But whatever it is, it is used. The best available approximation for the VWAP of a bar is (high + low + open + close) / 4. The indicator then collects the VWAPs of all bars and calculates the average price for the session. On larger timeframes, such as 15 or 60 min bars, anaCurrentDayVWAP may be 1 or 2 ticks off, because the necessary price and volume information to calculate a 100% accurate VWAP is not available with the bar series.
That price respects the visual level of the GomMPVWAP is just an illusion. But if you need that illusion, this is the way to go:
-> round the VWAP to the tick (needs a slight modification of the indicator code)
-> set the Plot Style of the VWAP plot to square and you will see a step function as for the other one
Last edited by Fat Tails; April 12th, 2012 at 04:45 PM.
The following user says Thank You to Fat Tails for this post:
I was not saying that your calculations are wrong, in fact, considering they are only being done bar by bar instead of tick by tick like Gomi's VWAP, they are amazingly accurate.
I thought maybe there was a NinjaTrader rendering issue. It looked like NinjaTrader was rendering your VWAP line at one edge of a price point's pixel range instead of in the middle, making it appear slightly off vis-a-vis price action. I thought Gomi's VWAP didn't have the same problem maybe because it has its own rendering engine.
However, the instructions you posted explain the issue. Additionally, you have correctly pointed out that the color of the VWAP line provides the proper guidance as to whether price is above or below it.
Thanks for your response and your work!
Know The Rules Well So You Can Break Them Effectively
Looks pretty much like a perfect match. Amazing. Even though this was a small change, I do think it certainly improves the usability of the indicator, not only the VWAP, but the bands as well, thanks again
Know The Rules Well So You Can Break Them Effectively
Last edited by srgtroy; April 14th, 2012 at 01:43 AM.
The following user says Thank You to srgtroy for this post:
I'm looking for a 3 day vwap. Would any programmers be able to convert ana38 to a three day version and could anybody tell me whether Gomi's MP will plot a three day vwap? Thanks
What do you need a 3-day VWAP for. Do you want a rolling 3-day VWAP or a 3-day VWAP that resets at the beginning of the session. This is the difference:
Rolling 3-day VWAP: Takes into account the last 72 hours of trades. Adds continuously new trades and subtracts trades prior to the period of 72 hours.
3-day VWAP: Starts at the beginning of the session with the volume weighted average price of the preceding 2 days and then adds the trades of the current day. After the end of the day it restarts with a gap.
Many thanks!
