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Weighted Alpha Rate this Topic:
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fgaston
Posted : Friday, February 24, 2017 8:30:24 AM
Registered User
Joined: 6/19/2014
Posts: 40

Hi:

I ran into a term/measurement I hadn't seen before called positive weighted alpha (that Zacks uses), and read the definition is: The exact formula for weighted alpha can be modified based on the preferences or objectives of the individual analyst. One version of weighted alpha might apply a weight of 1.5 to all activity within the past three months and a factor of 0.5 to all activity between nine and 12 months ago. Others may apply a gradually declining weight to all price movements as they stretch further back in time.

I don't see anything in the forums on in v17.  Is this anything you could help me take a crack at it, or are there equivalent formulas that are predictive at continued gains-momentum?
 
Thanks, Fred
 
Bruce_L
Posted : Friday, February 24, 2017 9:12:19 AM


Worden Trainer

Joined: 10/7/2004
Posts: 65,138

Is it just a weighted percent change? If so, there have been formulas written for IBD Relative Strength. It has a weighted percent change which is then converted to a percentile rank later.

40 * C / C63 + 20 * C / C126 + 20 * C / C189 + 20 * C / C252 - 100

I would think you would generally want the values to add up to unity (1 or 100%), but maybe this is not the case with a weighted alpha.

If you used a factor of 1.5 for the past three months and it overlaps like the IBD Relative Strength (so not adjusted for unity) you would get the following.

150 * C / C63 + 50 * C / C189 + 50 * C / C252 - 250

Adusted for unity this would be the following.

60 * C / C63 + 20 * C / C189 + 20 * C / C252 - 100

If the periods are overlapping then not adjusted for unity this would be the following.

150 * C / C63 + 50 * C63 / C189 + 50 * C189 / C252 - 250

And adjusted for unity it would be the following.

60 * C / C63 + 20 * C63 / C189 + 20 * C189 / C252 - 100



-Bruce
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