LengthShortEMA:= 12;

LengthLongEMA:= 26;

LengthSignalEMA:= 9;

//www.88gs.com

xShortEMA = EMA(VOL , LengthShortEMA);

xLongEMA = EMA(VOL , LengthLongEMA);

PVO:((xShortEMA - xLongEMA) / xLongEMA) * 100;

Signal: EMA(PVO , LengthSignalEMA);

DRAWTEXT(CROSS(PVO,Signal),PVO ,'buy'),colorred;

DRAWTEXT(CROSS(Signal,PVO),PVO,'sell'),colorwhite;