Hi,

I back-test with EUR/SEK and only act on 1h bars. I've recently found out that I get a very different result if I back-test with 1min bars or ticks. The result is consequently around +18 pips in difference for the 1min bars.

Any ideas on why I get this strange result?

Thanks.

I think result strongly depend on the logic of your strategy, for example - if you are using limit orders - they will be processed 'once per minute'. That means all min/max prices during the minute will most probably be ignored - i think orders will be processed using close price of 1-minute-bar.

PS: these are only my thoughts, I do not know exactly how it works ... but I was also getting rather different result when testing with 'tick' and '1 minute' accuracy.

True. But if I use PLACE_BID / PLACE_OFFER, shouldn't I get exact entry prices then?

Ok, so it seems that its a jforex issues:

This is one of my long order:

Order submitted with place_bid @ 10.29971
Order open price: 10.29954
3 last historical ticks:
shift 0: 10.29934/10.29954
shift 1: 10.29956/10.29976
shift 2: 10.29972/10.29992

I would expect my open price to be my place_bid price, but jforex seems to use the first ask price that's below my place_bid price.

=(

I think PLACE_BID and PLACE_OFFER is just not possible to "reliably" test on history - because of nature of these orders - there are no actually BUYers and SELLers for your orders.
Any "approximation" provided by tester will be "good enough".

What type of orders are you using in order to get the same open and close price regardless of backtesting with 1min or ticks?

I think there is no way to backtest on "1min" with the same accuracy as on "ticks", just because granularity of "1min" is different from "ticks". And this means - getting "same open and close prices" for both is not possible.