How to find out security with the most narrow bollinger band in X period.

for example: X=300

thanks for your supports.

data,

thanks for your useful supports.

Try coding like this:

{My variables}
a1:=BBandBot(C,20,S,4)-BBandTop(C,20,S,4);
a2:=Mov(C,20,E);
a3:=Mov(C,40,E);
{------------------------------------}
{Bollinger bands: the narrowest}
b1:=LLV(a1,100);
b2:=((a1-b1)/b1)*100;
b3:=(b2<5);
{------------------------------------}
{sideways}
c1:=HHV(a2,20)-LLV(a3,20);
c2:=c1<(0.1*C);
{------------------------------------}
{and moving in nearly the same line}
d1:=Mov(c1,20,S);
d2:=(Stdev(d1,20)<5);
b3*c2*d2

Write a sentence of what you want, break it out into segments, bracket the English,
then code each segment. This keeps you organized and it is easier to maintain and
change since the English is easier to read. Try plotting each b3,c2,d2 separately to
see if you want to change one, then just change the code.