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hi my friends, when my brokerage company do margin call? is it depend on brokerage company? thank you;

hi I use optimization option in strategy tester to test my stochastic expert advisor. I choose 1(start) to 200(stop) and 1(step)to all K period, D period and slowing values and i test it. then choose 1(start) to 10(stop) and 1(step) to all K period

i write a expert advisor that uses the stochastic signals. its regulary buy and sell operations (9, 4, 4). when i try high slowing values (slowing = 200) , expert advisor ignore a lot of signal. why is it? best regards;