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We use this often, but we code the moving average ourself. If you
want to construct a moving average of length say n days, calculate the
weight as
a = 2 / ( 1 + n )
and, using this weight, the moving average of say C as
m = ( 1 - a ) * Ref(m,-1) + a * C
I've actually not used Metastock for this, and am not sure it will
work, but this is the idea. Let me know the results! You also need
a start up value, so use
m = C
for the first value. We often don't even bother with the length,
but work directly with the weight, and pick say a = 0.01 for a very
slow or a = 0.25 for a very fast moving average (translates into a
199 and 7 day if my math is not failing me).
Now, to vary the length, vary this 'a' parameter. Say you have a
rule, and want to make the moving average slower or faster based on
the rule, then do something lie
a = a * ( 1 + faster * 0.01 - slower * 0.01 )
If faster is true you will increase the weight by 1% and if slower is
true you will decrease it by 1%.
Regards
MG Ferreira
TsaTsa EOD Programmer and trading model builder
http://www.ferra4models.com
http://fun.ferra4models.com
--- In equismetastock@xxxxxxxxxxxxxxx, meta_scott <no_reply@xxxx> wrote:
>
>
> Hello,
>
> Does anyone know a clean way of calculating exponential moving
> averages of variable length? THe second parameter of tmov function
> must be a constant.
>
> Thanks,
>
> Scott
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