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Andrew, I agree that correlation is a huge subject.
MetaStock's hindsight-based measurement of correlation doesn't cut it.
I've been working on just about every kind of correlation feasible in
MetaStock, and so far I've found that measuring correlation between two
securities based on the following, is the most promising:
1) a properly constructed Rate of Change % (i.e. not MS's RoC), and thus
deviance % from each security;
2) or base correlation on directional changes - that is, both securities'
direction (measured to a common lookback starting point) up/equal/down for
positive correlation, opposite directions for negative correlation.
So far I've found method #2 above the most promising candidate, as long as
the RoC's lookback period is based on time (calendar days) rather than
possibly irregularly spaced bars, and the equal zone has some % leeway
either side of it.
I may spend some more time on Log(RoC%) and see if there is anything
viable there.
Any thoughts on this matter appreciated.
jose '-)
http://www.metastocktools.com
--- In equismetastock@xxxxxxxxxxxxxxx, andrew_tomlinson@xxx wrote:
>
> Also you need to consider whether you are correlating raw prices, %
changes, log changes, etc. Makes abig difference.
>
> Andrew
>
>
>
> -------------- Original message --------------
> From: "Jose Silva" <josesilva22@xxx>
>
> It's funny you should ask about this, Kevin, because I'm in the middle
> of incorporating something similar into the next major release of the
> URSC toolkit.
>
> Basically, what you are asking is for a comparison of the two contracts'
> rate of change. There are many issues involved in plotting a valid
> comparison (such as a synchronized starting point and a valid % RoC) and
> the URSC toolkit covers all the important ones.
>
> More here:
> http://www.metastocktools.com/URSC/URSC.htm
>
> jose '-)
> http://www.metastocktools.com
>
>
>
> --- In equismetastock@xxxxxxxxxxxxxxx, Kevin Barry <kevin_barry@>
> wrote:
>
> Hello,
>
> Could I pick your (collective) brains?
>
> Two securities can be compared using the Security function and then
> subtracting or dividing one plot from the other. The results in a
> trending plot.
>
> What I would like to achieve is to plot equity A as a straight line and
> then have the second plot displaying the difference between equity A and
> equity B. Ideally, this plot would indicate the percentage deviation
> rather than just the number of points difference.
>
> For those of you interested, the idea behind Pairs Trading is to
> identify two stocks that are closely correlated. When a divergence is
> detected, one would go long, say, equity A and short equity B in
> anticipation of the correlation being reestablished in the future.
> It is a market neutral strategy.
>
> Is this doable in Metastock?
>
> Regards,
> Kevin
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