[amibroker] SP500 seasonal trend

["cagigas00" <cagigas00@xxxxxxxx>]

Graham,

I am trying to find a way to plot the seasonal trend of the SP500 
index. I need to average the ROC of the same day of the year of 
previous years. I can do it forward (adding as the plot progress) but 
I want a solution that uses all data in every part of the chart. The 
real solution is identical every year. This is one of Larry Williams 
indicators. The code below doesn't work although I think it shows what 
I want to achive. Can you help?

Thanks

for(i=1;i<366;i++)
{
temp=Year();
a=IIf(DayOfYear()==i AND Year()!=temp,ROC(C,1),0);
b=Sum(a,10);
Plot(b,"b",colorRed,styleLine);
}






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