//------------------------------------------------------------------------------
//
//  Formula Name:    Dave Landry PullBack Scan
//  Author/Uploader: Dennis Skoblar 
//  E-mail:          DennisAndLisa@sbcglobal.net
//  Date/Time Added: 2005-06-22 02:29:14
//  Origin:          "Dave Landry On Swing Trading" and "Dave Landry's 10 Best Swing Trading Patterns And Strategies"
//  Keywords:        Dave Landry,Landry,pullback scan,pullback
//  Level:           medium
//  Flags:           system,exploration
//  Formula URL:     http://www.amibroker.com/library/formula.php?id=481
//  Details URL:     http://www.amibroker.com/library/detail.php?id=481
//
//------------------------------------------------------------------------------
//
//  This is the Dave Landry PullBack Scan as developed by him and taken from
//  his two books, "Dave Landry On Swing Trading" and "Dave Landry's 10 Best
//  Swing Trading Patterns And Strategies". The scan searches for stocks making
//  a pullback from their most recent 20 day highs or 20 day lows. This is best
//  used as an Exploration, all the ColumnNames can be seen and used as
//  filters. Drop the "Tools" drop down menu in the Formula Editor containing
//  this code and toggle the "Apply Indicator" to get the chart layout
//  displayed.
//
//------------------------------------------------------------------------------

// Dave Landry Pullback Scan. 
// Coded by Dennis Skoblar 6/8/2005.
// As adapted by "Dave Landry On Swing Trading" and "Dave Landry's 10 Best Swing Trading Patterns And Strategies".
// Special "Thank You" to Dave Landry, the Yahoo Groups Amibroker Club and the Amibroker Support Staff for thier help.
//
// This is best used as an Exploration, all the ColumnNames can be seen and used as filters.
// Drop the "Tools" drop down menu in the Formula Editor containing this code and toggle the "Apply Indicator" to get the chart layout displayed.
// Best used against a black background.

//======================= Variables ==================================================================================================================

// PullBack Parameters

DLL1 = Ref(H,-1) > Ref(HHV(H,20),-2) AND H < Ref(H,-1);
DLL2 = Ref(H,-2) > Ref(HHV(H,20),-3) AND H < Ref(H,-2);
DLL3 = Ref(H,-3) > Ref(HHV(H,20),-4) AND H < Ref(H,-3);
DLL4 = Ref(H,-4) > Ref(HHV(H,20),-5) AND H < Ref(H,-4);
DLL5 = Ref(H,-5) > Ref(HHV(H,20),-6) AND H < Ref(H,-5);
DLL6 = Ref(H,-6) > Ref(HHV(H,20),-7) AND H < Ref(H,-6);
DLL7 = Ref(H,-7) > Ref(HHV(H,20),-8) AND H < Ref(H,-7);
DLL8 = Ref(H,-8) > Ref(HHV(H,20),-9) AND H < Ref(H,-8);  
DLL= H < Ref(HHV(H,20),-1);
DLS1 = Ref(L,-1) < Ref(LLV(L,20),-2) AND L > Ref(L,-1);
DLS2 = Ref(L,-2) < Ref(LLV(L,20),-3) AND L > Ref(L,-2);
DLS3 = Ref(L,-3) < Ref(LLV(L,20),-4) AND L > Ref(L,-3);
DLS4 = Ref(L,-4) < Ref(LLV(L,20),-5) AND L > Ref(L,-4);
DLS5 = Ref(L,-5) < Ref(LLV(L,20),-6) AND L > Ref(L,-5);
DLS6 = Ref(L,-6) < Ref(LLV(L,20),-7) AND L > Ref(L,-6);
DLS7 = Ref(L,-7) < Ref(LLV(L,20),-8) AND L > Ref(L,-7);
DLS8 = Ref(L,-8) < Ref(LLV(L,20),-9) AND L > Ref(L,-8);
DLS = L > Ref(LLV(L,20),-1);

// Price and Volume 
PVFilter = (C>15) AND Ref(MA(V,50),-1)>100000;

// Dave Landry PullBack Scan
DLPBS = ((DLL AND (DLL1 OR DLL2 OR DLL3 OR DLL4 OR DLL5 OR DLL6 OR DLL7 OR DLL8)) OR (DLS AND (DLS1 OR DLS2 OR DLS3 OR DLS4 OR DLS5 OR DLS6 OR DLS7 OR DLS8))) AND PVFilter;  

// Moving Average Proper Order
MAProperOrder = (MA(C,10) > EMA(C,20) AND EMA(C,20) > EMA(C,30)) OR (MA(C,10) < EMA(C,20) AND EMA(C,20) < EMA(C,30));

// How far the stock has moved in the past month (preferable at least 10 pts in the past 20 days)
TenTwentyFilter = HHV(H,20)-LLV(L,20);

// 50 Day Historical Volatility
FiftyDayHVFilter = round(StDev(log(C/Ref(C,-1)),50)*100*sqrt(256));

//=================== End Variables =================================================================================================================

//=================== Columns =======================================================================================================================

NumColumns = 5;

Column0 = FullName();     
Column0Name = "Ticker name";
           
Column1	  = DLL AND (DLL1 OR DLL2 OR DLL3 OR DLL4 OR DLL5 OR DLL6 OR DLL7 OR DLL8);
Column1Name = "Buy Signal";

Column2     = DLS AND (DLS1 OR DLS2 OR DLS3 OR DLS4 OR DLS5 OR DLS6 OR DLS7 OR DLS8);
Column2Name = "Sell Signal"; 

Column3     = TenTwentyFilter;
Column3Name = "10/20 Value";

Column4		= FiftyDayHVFilter;
Column4Name	="HV50 Value";

AddTextColumn( IndustryID(1), "Industry" );

AddTextColumn( MarketID(1), "Market" );

//==================== End Columns ===================================================================================================================

//==================== Filter and Buy/Sell criteria ==================================================================================================

// Filter based on 20 day hi/lo pullback, price and volume criteria.
Filter = DLPBS; // Delete this line and use the next line if you desire the moving averages to be scanned in "proper order".
//Filter = DLPBS AND MAProperOrder; 
Buy  = Column1;
Sell = Column2;

//====================  End Filter and Buy/Sell criteria =============================================================================================

//======================= Chart Layout  ==============================================================================================================

// OHLC bar graph with headings
_SECTION_BEGIN("Price"); 
SetChartOptions(0,chartShowArrows|chartShowDates);
_N(Title = StrFormat("{{NAME}} - {{INTERVAL}} {{DATE}} Open %g, Hi %g, Lo %g, Close %g (%.1f%%) {{VALUES}}", O, H, L, C, SelectedValue( ROC( C, 1 ) ) ));
Plot( C, "Close", ParamColor("Color", colorYellow ), styleBar | ParamStyle("Style") | GetPriceStyle() ); 
_SECTION_END();

// 20 period linear regression line
x = Cum(1); //
lastx = LastValue( x ); Daysback = 20; aa = LastValue( LinRegIntercept( Close, Daysback) );
bb = LastValue( LinRegSlope( Close, Daysback ) );
y = Aa + bb * ( x - (Lastx - DaysBack) ); 
Plot( IIf( x >= (lastx - Daysback), y, -1e10 ), "LinReg", colorCustom11 );

// 10 period SMA
_SECTION_BEGIN("MA");
P = ParamField("Price field",-1);
Periods = Param("Periods",10 );
Plot( MA( P, Periods ), _DEFAULT_NAME(), ParamColor( "Color", colorBlue ), ParamStyle("Style") ); 
_SECTION_END();

// 20 period EMA
_SECTION_BEGIN("EMA");
P = ParamField("Price field",-1);
Periods = Param("Periods", 20 );
Plot( EMA( P, Periods ), _DEFAULT_NAME(), ParamColor( "Color", colorRed ), ParamStyle("Style") ); 
_SECTION_END();

// 30 period EMA
_SECTION_BEGIN("EMA1");
P = ParamField("Price field",-1);
Periods = Param("Periods", 30);
Plot( EMA( P, Periods ), _DEFAULT_NAME(), ParamColor( "Color", colorCustom12 ), ParamStyle("Style") ); 
_SECTION_END();

// Add 50 Day Historical Volotility and 10/20 filter as a different screen, just cut and paste each one to a separate Formula Editor Sceen and save them under
// Custom Indicators...then drop them into the main screen.

// 50 day historical volotility
// _SECTION_BEGIN("HV50");
// HV50 = round(StDev(log(C/Ref(C,-1)),50)*100*sqrt(256));
// Plot(HV50,"HV50",colorYellow,styleLine);
// _SECTION_END();

// 10/20 filter
// _SECTION_BEGIN("TenTwentyValue");
// TenTwentyValue = HHV(H,20)-LLV(L,20);
// Plot(TenTwentyValue,"10/20 Value",colorRed,styleLine);
// _SECTION_END();

//======================= End Chart Layout  ===========================================================================================================