This code may help you BR
////////////////// LINEAR REGRESSION /////////////////////////////////// //http://www.amibroker.com/library/detail.php?id=438 //OK P = H;//ParamField("Price field",-1); Daysback = Param("Period for Liner Regression Line",21,1,240,1); shift = Param("Look back period",0,0,240,1); // =============================== Math Formula===================================== x = Cum(1); lastx = LastValue( x ) - shift; aa = LastValue( Ref(LinRegIntercept( p, Daysback), -shift) ); bb = LastValue( Ref(LinRegSlope( p, Daysback ), -shift) ); y = Aa + bb * ( x - (Lastx - DaysBack +1 ) ); // ==================Plot the Linear Regression Line================================== LRColor = ParamColor("LR Color", colorCycle ); LRStyle = ParamStyle("LR Style"); LRLine = IIf( x > (lastx - Daysback) AND BarIndex() < Lastx, y, Null ); Plot( LRLine , "LinReg", LRCOLOR, LRSTYLE ); // styleDots ); Plot(C,"Close",colorBlack,styleBar); _N(Title = "LINEAR REGRESSION - "+StrFormat("{{NAME}} - {{INTERVAL}} {{DATE}} Open %g, Hi %g, Lo %g, Cl %g {{VALUES}}", O, H, L ,C )); Le 31/01/2010 20:11, wooziwog a écrit : > > > The following formula plots the Linear Regression. I have created the > start and ending points for the linearray as well as the starting and > ending y values. When I press the "apply indicator" the line array > appears for a moment and then disappears. Any help in identifying my > coding error is appreciated. > > Thanks, > > David K. > > //Linear Regression Line Array > > GraphXSpace=5; > Plot(C,"",29,128|4); > > pds=20; > lbk=0; > bi = BarIndex()+1; > sb = SelectedValue(BarIndex()); > sx = SelectedValue(bi)-lbk; > aa = SelectedValue(Ref(LinRegIntercept(C,pds),-lbk)); > bb = SelectedValue(Ref(LinRegSlope(C,pds),-lbk)); > yy = aa + bb * (bi-(sx - pds+1)); > xs = sb - pds - lbk;//Linearray starting point > ys = SelectedValue(Ref(yy, -pds-lbk));//Linearray starting value > xe = sb - lbk;//Linearray ending point > ye = ys + bb *(xe - xs);//Linearray starting value > LR = IIf(bi >= (sx - pds) AND bi <= sx, yy, Null);//standard LR line > Plot(LR, "LR", 10, 1);//plot Linear Regression Line > > Plot(IIf(bi>xs,ys,Null),"",36,8);//Linearray starting Value from "xs" > Plot(IIf(bi>xe,ye,Null),"",36,8);//Linearray ending Value from "xe" > Plot(LineArray(xs,ys,xe,ye,1),"LR",25,1);//This line only plots for a > moment when "apply indicator" is pressed and then disappears > > ------------------------------------ **** IMPORTANT PLEASE READ **** This group is for the discussion between users only. This is *NOT* technical support channel. TO GET TECHNICAL SUPPORT send an e-mail directly to SUPPORT {at} amibroker.com TO SUBMIT SUGGESTIONS please use FEEDBACK CENTER at http://www.amibroker.com/feedback/ (submissions sent via other channels won't be considered) For NEW RELEASE ANNOUNCEMENTS and other news always check DEVLOG: http://www.amibroker.com/devlog/ Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/amibroker/ <*> Your email settings: Individual Email | Traditional <*> To change settings online go to: http://groups.yahoo.com/group/amibroker/join (Yahoo! ID required) <*> To change settings via email: [email protected] [email protected] <*> To unsubscribe from this group, send an email to: [email protected] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
