Comments on: Trading systems virtualization to achieve equity line fitting – a myth ? http://mqlmagazine.com/mql-programming/trading-systems-virtualization-to-achieve-equity-line-fitting-a-myth/ All things MetaTrader Fri, 27 Jan 2012 16:37:30 +0000 http://wordpress.org/?v=2.9.2 hourly 1 By: SystemTrader http://mqlmagazine.com/mql-programming/trading-systems-virtualization-to-achieve-equity-line-fitting-a-myth/comment-page-1/#comment-15896 SystemTrader Fri, 13 May 2011 16:32:45 +0000 http://mqlmagazine.com/?p=2358#comment-15896 Besides trading the equity curve by implementing a demo account via an array, you can also define the trading statistics you found in historical testing, and use them to create a scoring of the system. When the score is low, the system stops live trading, and if the stats "mend," it will turn on again. So, anytime you don't like how the system is performing, you'll know that you're still trading the same statistics you initially agreed to. Besides trading the equity curve by implementing a demo account via an array, you can also define the trading statistics you found in historical testing, and use them to create a scoring of the system. When the score is low, the system stops live trading, and if the stats “mend,” it will turn on again. So, anytime you don’t like how the system is performing, you’ll know that you’re still trading the same statistics you initially agreed to.

]]> By: SystemTrader http://mqlmagazine.com/mql-programming/trading-systems-virtualization-to-achieve-equity-line-fitting-a-myth/comment-page-1/#comment-15895 SystemTrader Fri, 13 May 2011 16:19:35 +0000 http://mqlmagazine.com/?p=2358#comment-15895 This is good, just way more advanced than my knowledge of mql. After three months of thinking about how in the world I could make a simulated account inside an EA, I completed it yesterday. Basically, when a stop is placed, I assign the stop level to a variable, then watch for the trade to be opened. When the fake trade is closed, I add the new simulated balance to an array, which is basically the simulated account. I run a simple MA on the array, and that's the equity curve. If SimAccountArray[0]<the equity curve, it sets the variable LiveTrade to 0, else it's 1. The only places this LiveTrade variable are checked are when placing an actual trade. The "problem" with my approach is that for each EA, accurately following trades in a simulated manner is unique to that EA and takes some time figuring it out. This is good, just way more advanced than my knowledge of mql. After three months of thinking about how in the world I could make a simulated account inside an EA, I completed it yesterday. Basically, when a stop is placed, I assign the stop level to a variable, then watch for the trade to be opened. When the fake trade is closed, I add the new simulated balance to an array, which is basically the simulated account. I run a simple MA on the array, and that’s the equity curve. If SimAccountArray[0]<the equity curve, it sets the variable LiveTrade to 0, else it's 1. The only places this LiveTrade variable are checked are when placing an actual trade.

The "problem" with my approach is that for each EA, accurately following trades in a simulated manner is unique to that EA and takes some time figuring it out.

]]> By: Bogdan Caramalac, MQLmagazine sr.editor http://mqlmagazine.com/mql-programming/trading-systems-virtualization-to-achieve-equity-line-fitting-a-myth/comment-page-1/#comment-956 Bogdan Caramalac, MQLmagazine sr.editor Sat, 10 Jul 2010 16:08:07 +0000 http://mqlmagazine.com/?p=2358#comment-956 Due to conceptual errors that I didn't see at the time, when running virtualization over portfolios, the system will not account for the differences in pip value that exist between forex pairs; also it doesn't seem to account for the difference between going long or going short (just bid and ask are changed). Alas, the pip value adjusting calculus was not possible in a normal fashion, requiring workarounds. However, since build 292, about July 10, SYMBOL_TRADE_TICK_VALUE and SYMBOL_TRADE_TICK_SIZE return correct values. Therefore, Virtualization.mqh code will be updated, but only in the download link file. Also, a new update will come soon, to allow pending orders. Due to conceptual errors that I didn’t see at the time, when running virtualization over portfolios, the system will not account for the differences in pip value that exist between forex pairs; also it doesn’t seem to account for the difference between going long or going short (just bid and ask are changed). Alas, the pip value adjusting calculus was not possible in a normal fashion, requiring workarounds. However, since build 292, about July 10, SYMBOL_TRADE_TICK_VALUE and SYMBOL_TRADE_TICK_SIZE return correct values. Therefore, Virtualization.mqh code will be updated, but only in the download link file.
Also, a new update will come soon, to allow pending orders.

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