Some charting programs use a value for margin rates that may differ from your broker's specification. For instance, your broker may require a 50% margin to enter a short position. In the Genetic System Search for Technical Analysis program Brokerage Configuration window and in older versions of Equis MetaStock, use the same value. In the Equis MetaStock Enhanced System Tester, you would enter 150%. See the full explanation of this discrepancy in the Equis MetaStock Knowledge Base.