MetaTrader Tips – Expert Advisor Optimization
Let’s look at how to optimize an expert advisor. In the example below we will look to optimize the size of stop loss and take profit.
Expert Optimization Steps
1. Open the Strategy Tester window by pressing Ctrl+R.

2. In the Strategy Tester window, select Expert Properties
3. Select the Optimized parameters ( in our example stop-loss and stop-profit)

4. Enter the initial values of the optimized parameters, step and stop
5. Close the window
6. Select Optimization
7. Choose a model for optimization ( a model “ Open prices only (fastest method to analyze the bar just completed)” corresponds to the most advisors, although for greater accuracy it is possible to test on Every tick (based on all available least timeframes) but then time of optimization substantially will be increased.
8. Press start
9. After completion of optimization, open Optimization result and choose parameters considering a highest income and minimum drawdown. (obviously income should be high and drawdown should be less)
Source: http://www.metatraderglobal.com/612/metatrader-tips-expert-advisor-optimization/
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