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simple 5 min time candle is wrong
SFXbernhard
 Post subject: simple 5 min time candle is wrong Post rating: 0   New post Posted: Fri 04 Apr, 2014, 17:18 
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Please compare the following 2 charts from 24-Mar-2014 8 o'clock GMT

Tick chart
Image

5 min chart
Image

The horizontal line is unchanged in both charts.
Why was there no open price of < 1.3800 of the 5min candle of 08:00? The last tick, as marked in the tick chart, was clearly in the beginning of the 08:00 candle.

Seen in JForex DEMO ver. 2.33.2, API ver. 2.9.7


Attachments:
140424tickChart.png [48.74 KiB]
Downloaded 368 times
140424_5minChart.png [39.54 KiB]
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Platform Support
 Post subject: Re: simple 5 min time candle is wrong Post rating: 0   New post Posted: Tue 08 Apr, 2014, 09:58 
JForex Master
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We assume the 5 min chart was opened at the moment when this candle formed. Platform may skip ticks in order to avoid slow processing and showing of old prices. If it has skipped some ticks, candle data might be different on the chart until you restart the platform. Only on platform restart the intraday data should be synced with server.

Please try restarting the platform and check 5 minutes period candle again. If it still differs from the OHLC data provided below, please let us know.

Time (GMT):2014-3-24 8:00
Open: 1.37984
High: 1.38266
Low: 1.37984
Close: 1.38172
 
hebasto
 Post subject: Re: simple 5 min time candle is wrong Post rating: 0   New post Posted: Tue 08 Apr, 2014, 10:30 
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Platform Support wrote:
Platform may skip ticks in order to avoid slow processing and showing of old prices.
Due to principle "garbage in, garbage out" the strategy testing on Dukascopy's data has no point. In the Historical Tester a tick feed is complete while in realty the platform passes to a strategy a deficient tick feed. Any perfect trading logic may just fail in a such environment.

Support Team, why are you talking about 'slow processing' if JForex system requirements are clearly stated on Dukascopy's site?

If one's system fully meets Dukascopy's requirements no tick skipping is allowed. Or platform design is poor.
Is it possible (somehow) the platform does skip ticks or does not skip ticks on user's decision?
 
Platform Support
 Post subject: Re: simple 5 min time candle is wrong Post rating: 0   New post Posted: Tue 08 Apr, 2014, 12:45 
JForex Master
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Question: what would you do, if for some reason (software or transport problem) there would come in a bunch of ticks at exactly the same time?

1. In case you decide to process all of them, you will have a price delay. The most recent tick will be received later than it would be in case you would skip the unprocessed ticks except the most recent one.
2. In case you decide to skip unprocessed ticks and process only the last one, you will have incomplete price history, but will be processing the last tick earlier than in case described in point #1.

We go with the second one. So do many trading plaforms.
However, we might offer this as an option in the future.
 
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