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[EquisMetaStock Group] Need help for I am fresh to MS



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Who can help me to explain on following formula?

Period := Input("Period",1,10000,20);
sc := Abs(RSI(Period)/100 - .5)*2;
If(Cum(1) <= Period, CLOSE, PREV + sc*(CLOSE - PREV));

Q1: What's the meaning of Cum(1) though I knew cum iS an abbreviation 
of CUMULATE. cumulate one for what?
Q2:What is PREV? previous for CLOSE or what?

Thanks for your help in advance.







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