//+------------------------------------------------------------------+
//|                                                     St_LRegr.mq4 |
//|                                                         Stajer59 |
//|                                      http://www.stajer59.ucoz.ru |
//+------------------------------------------------------------------+
#property copyright "Stajer59"
#property link      "http://www.stajer59.ucoz.ru"

#property indicator_chart_window
#property indicator_buffers 7
#property indicator_color1 Red
#property indicator_color2 Green
#property indicator_color3 Green
#property indicator_color4 PaleTurquoise
#property indicator_color5 PaleTurquoise
#property indicator_color6 Silver
#property indicator_color7 Silver

//---- input parameters
extern int       N=240;
extern double    StdDev=1.0;
//---- buffers
double ExtMapBuffer1[];
double ExtMapBuffer2[];
double ExtMapBuffer3[];
double ExtMapBuffer4[];
double ExtMapBuffer5[];
double ExtMapBuffer6[];
double ExtMapBuffer7[];
//+------------------------------------------------------------------+
int init()
  {
   SetIndexStyle(0,DRAW_LINE);
   SetIndexBuffer(0,ExtMapBuffer1);
   SetIndexStyle(1,DRAW_LINE);
   SetIndexBuffer(1,ExtMapBuffer2);
   SetIndexStyle(2,DRAW_LINE);
   SetIndexBuffer(2,ExtMapBuffer3);
   SetIndexStyle(3,DRAW_LINE);
   SetIndexBuffer(3,ExtMapBuffer4);
   SetIndexStyle(4,DRAW_LINE);
   SetIndexBuffer(4,ExtMapBuffer5);
   SetIndexStyle(5,DRAW_LINE);
   SetIndexBuffer(5,ExtMapBuffer6);
   SetIndexStyle(6,DRAW_LINE);
   SetIndexBuffer(6,ExtMapBuffer7);
   
   return(0);
  }
//+------------------------------------------------------------------+
int deinit()
  {
   return(0);
  }
//+------------------------------------------------------------------+
int start()
  {
   int    j;
   double   a,b,Summ_x,Summ_y,Summ_x_2,Summ_xy,Deviation,StdDeviation,Sredn_y;
   if (Bars < N+1) return(0);
   for (int x=1;x<=N;x++)
   {  j=N-x;  
      Summ_x=Summ_x+x;  
      Summ_y=Summ_y+Close[j];   
      Summ_xy=Summ_xy+x*Close[j]; 
      Summ_x_2=Summ_x_2+MathPow(x,2); 
   }
      b=(N*Summ_xy-Summ_x*Summ_y)/(N*Summ_x_2-MathPow(Summ_x,2));  
      a=(Summ_y-b*Summ_x)/N;
      Sredn_y=Summ_y/N;
   for (x=1;x<=N;x++)
      {
         j=N-x;
         Deviation=Deviation+MathPow((Close[j]-Sredn_y),2);
      }
      StdDeviation=MathSqrt(Deviation/N);
      ExtMapBuffer1[N]=EMPTY_VALUE;
      ExtMapBuffer2[N]=EMPTY_VALUE;
      ExtMapBuffer3[N]=EMPTY_VALUE;
      ExtMapBuffer4[N]=EMPTY_VALUE;
      ExtMapBuffer5[N]=EMPTY_VALUE;
      ExtMapBuffer6[N]=EMPTY_VALUE;
      ExtMapBuffer7[N]=EMPTY_VALUE;
 
    for (x=1;x<=N;x++)
      {  j=N-x;   
         ExtMapBuffer1[j]=b*x+a; 
         ExtMapBuffer2[j]=b*x+a+StdDev*StdDeviation;
         ExtMapBuffer3[j]=b*x+a-StdDev*StdDeviation;
         ExtMapBuffer4[j]=b*x+a+1.5*StdDev*StdDeviation;
         ExtMapBuffer5[j]=b*x+a-1.5*StdDev*StdDeviation;
         ExtMapBuffer6[j]=b*x+a+2.0*StdDev*StdDeviation;
         ExtMapBuffer7[j]=b*x+a-2.0*StdDev*StdDeviation;
      }
      
   return(0);
  }
//+------------------------------------------------------------------+