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Weekly Stochastic Oscillator EMA
================================

A prerequisite for this indicator is Jose Silva's "Calendar Week
counter".
"Weekly Stochastic Oscillator EMA" plots a weekly stochastic
oscillator and signal with EMA smoothing on any daily chart.

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  {Weekly Stochastic Osc EMA}
  {© 2004 Roy Larsen, rlarsen@man.quik.co.nz}
  {for use on daily charts with
   Jose Silva's "Calendar Week counter"}
K:=Input("Weekly Stochastic Oscillator %K Periods",1,99,5);
N:=Input("%K Slowing Periods" ,1,99,3);
R:=Input("%D EMA Periods",1,99,3);
F:=Input("End of Week,  5=Friday  6=Saturday  7=Sunday",5,7,5);
Q:=Input("Display Mode,  0=Static  1=Dynamic  2=Test",0,2,2);
  {0=Display, update on Friday when possible}
  {1=Display, update on each new bar}
  {2=Backtest, update on first bar of new week}
G:=LastValue(Highest(Sum(DayOfWeek()=F,5))=5);
I:=Fml("Calendar Week counter");
I:=Abs(I-ValueWhen(2-G,1,I)); M:=G OR I>0;
F:=G OR (DayOfWeek()=F AND I=0);
A:=LastValue(Cum(1)-1)=Cum(1);
B:=LastValue(Cum(1))=Cum(1);
J:=If(F,1,If(Alert(F,2)=0 AND M,2,0));
J:=If(A+LastValue(J)>2 OR B+(Q=1)=2,1,J);
J:=If(G,1,If(Q=2 OR Cum(J)<=1,M*2,J));
Hw:=HighestSince(1,M,H);
Hw:=ValueWhen(1,J,If(J=1,Hw,ValueWhen(2,1,Hw)));
Lw:=LowestSince(1,M,L);
Lw:=ValueWhen(1,J,If(J=1,Lw,ValueWhen(2,1,Lw)));
Cw:=ValueWhen(1,J,If(J=1,C,ValueWhen(2,1,C)));
Hw:=ValueWhen(1,Hw>0,Hw);
Lw:=ValueWhen(1,Lw>0,Lw);
Cw:=ValueWhen(1,Cw>0,Cw);
Z:=Cum((Cw-LowestSince(K,J,Lw))*(J>0));
Z:=Z-ValueWhen(N+1,J,Z);
I:=Cum((HighestSince(K,J,Hw)- LowestSince(K,J,Lw))*(J>0));
I:=I-ValueWhen(N+1,J,I);
I:=ValueWhen(1,Cum(I>0)>0,I);
X:=100*Z/I; A:=2/(1+R);
X:=ValueWhen(1,Cum(J>0)>=K+N,X);
Y:=ValueWhen(1,J,PREV)*(1-A)+X*A;
Y:=ValueWhen(1,Cum(J>0)>=K+N+R,Y);
X; {%K}
Y; {%D}

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http://www.metastocktips.co.nz/