Bill: You were looking for bands that had constricted to x amount
(for example, 2 or 3 percent). You could build on the Bollinger band
values scan and do it like this:
//bbands, by Brooke
output="bolling.lst";
float bolbandlower, bolbandlprev, bolbandupper, bolbandmid;
bolbandlower:=movavg(0,20,cl)-(StDev(0,-19)*2);
//bolbandlprev:=movavg(-1,20,cl)-(StDev(-1,-20)*2);
bolbandupper:=movavg(0,20,cl)+(StDev(0,-19)*2);
bolbandmid:=movavg(0,20,cl);
if bolbandupper<=1.03*bolbandlower then //Percentage of upper vs. lower
println Symbol, ", " , " Close:", Close(0):6:3, ", " ,
"Upper vs. lower: ", bolbandupper/bolbandlower:6:2, ", ",
"Bollinger upper: ", bolbandupper:6:2, ", ",
"Bollinger lower: ", bolbandlower:6:2, ", ",
"Bollinger middle: ", bolbandmid:6:2;
endif;
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