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Hi Nick,
I used a 20-days Simple Bollinger Band with 2 sigmas.
Let's break the formula down into separate pieces:
(If(C>=BBandBot(C,20,S,2) AND C<=BBandTop(C,20,S,2),1,0))
Function: if the close is between the Bollinger Bands, this generates a
1.
(Cum(If(C>=BBandBot(C,20,S,2) AND C<=BBandTop(C,20,S,2),1,0)))
Function: counts the total number of days the close is between the
Bollinger Bands.
(-19+Cum(1))
Function: counts the total number of days in test, but because a 20-day
Bollinger Band needs 20 closes to calculate the Band, you need to
subtract 20 days. But then your get a "divide by zero" error, so I
changed it to 19 days.
Hopefully this works for you? If not, just ask.
Regards,
Onno
----- Origineel Bericht -----
Van: "Nick Channon" <nick.channon@xxxxxxxxxxxxx>
Datum: Vrijdag 21 September 2001 9:39
Onderwerp: Re: More about Bollinger Bands...
> Hi Onno,
>
> Thanks for posting this formula. I've tried it out but I don't
> understandhow to interpret it - could you kindly post some further
> explanation?
> Regards,
> Nick
>
>
> -----Original Message-----
> From: onno goedknegt <o.goedknegt@xxxxxxxxx>
> To: metastock@xxxxxxxxxxxxx <metastock@xxxxxxxxxxxxx>
> Date: Friday, 21 September, 2001 6:55
> Subject: More about Bollinger Bands...
>
>
> >Hi all,
> >
> >Recently I developed a formula which shows the "reliability" of
> >Bollinger Bands. The indicator shows the chances the close is within
> >the Bollinger Bands:
> >
> >(Cum(If(C>=BBandBot(C,20,S,2) AND
> >C<=BBandTop(C,20,S,2),1,0)))/(-19+Cum(1))
> >
> >For the DJIA 1900-1997: 87.5 %
> >
> >Regards,
> >Onno
> >
> >
>
>
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