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It's purely related to personal preference.
I often use 21 periods, as this covers an average month's trading 
period (252 yearly trading periods / 12 months).
  1 week:   5 periods
 1 month:  21 periods
3 months:  63 periods
6 months: 126 periods
  1 year: 252 periods (assuming 8 market holidays per year)
200 periods is often popular with some fund managers.  A 200-period 
SMA is considered cutting edge technology by these wizards.  ;)
jose '-)
http://www.metastocktools.com
--- In equismetastock@xxxxxxxxxxxxxxx, "mmbbrr79" <markyboy5@xxx> 
wrote:
>
> I'm wondering why certain periods are more widely used in moving
> averages than others - the 9 day, the 21 day, the 50 day, the 120
> day, etc.  What makes these time periods more indicative than
> others?
> Thanks!
> - M
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