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My understanding is that it is based upon your Positionscore = xxx
statement :
Positionscore = ROC(C,10); // for example
posqty = 1;
SetOption("WorstRankHeld",3);
SetOption("MaxOpenPositions",posqty);
Positionsize = -100/posqty;
The stocks you are trading are ranked by their score.
The #1 stock on the list is purchased and held until its positionscore
rank is below #3. Then the #1 stock on the list according to ROC(C,10)
is purchased.
Pretty straightforward.
The only caveat is that Positionscore returns the _absolute value_, so
a score of -100 is greater than a score of 90. Unless you really want
to do this, do something like
score = ROC(C,10);
Positonscore = score + 1000; //OR
score = ROC(C,10);
positonscore = IIf(score > 0, score, 0 );
This will insure that negative scores are lower ranked.
dale b
> All,
>
> I believe I fully understand the procedure that Tomasz is using to
> implement rotational trading,except for one detail described in the
online guide...
>
> "Exits are generated automatically when security's rank drops below
'worst
> rank held'"
> http://www.amibroker.com/guide/afl/afl_view.php?enablerotationaltrading
>
> This is a vague statement as it does not mention any specific units of
> measure. Is WorstRankHeldmeasured in percentile ranking of the
PositionScores? Is there a
> constraint that Position Scores mustbe in a specific range (-100 - 100)?
>
> Can anyone give me a specific example to clarify this point?
>
> -- John
>
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