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Suggestion Free Backtesting Service Data Quality 99.90%

brekz1 said:
right:ok:
Click to expand...
So why is it possible to only achieve 99% modeling quality/accuracy?

1: Backtesting on MetaTrader 4 assumes you will never experience slippage, which is certainly not true when trading live, especially with scalping EAs.

2: In MQL, MetaTrader 4’s programming language, the integral function start() which begins the data processing for every EA, only receives a tick if it has successfully processed the previous tick. Depending on the data and other factors, it’s not uncommon for an EA to skip ticks while backtesting.

3: Backtesting on MetaTrader 4 only permits the user a fixed spread. Most brokers now use a variable spread which can fluctuate by as much as 200% throughout a trading day.
 
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