Introduction
Very often we face situations when an Expert Advisor successfully operates with one brokerage company and is not profitable or even lossmaking on the other one. The reasons may be different. Different brokerage companies have different settings:
- Quotes. They slightly differ because of two factors - different data feeds and different filtration that smooths quotes. For some Expert Advisors this may be relevant. Situations may occur when an EA trades often with one brokerage company and rarely on another one.
- Slippage. It may differ much in different brokerage companies. This also may lead to worse characteristics of an EA because of lower expected profit.
- Requotes. In some brokerage companies they are oftener than in others. In this case an EA will miss successful entering points because of large number of requotes.
http://articles.mql4.com/508
