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This probably helps (via CBT):
http://www.amibroker.com/kb/2006/03/06/re-balancing-open-positions/
PS
--- In amibroker@xxxxxxxxxxxxxxx, "KBGlenn" <kbglenn@xxx> wrote:
>
> Could someone please give me some suggestions on how I might 
> accomplish the following:
> 
> - Establish a basket of stocks (I can do this)
> - Review the basket periodically and determine which meet certain 
> criteria (I can do this)
> - Buy all stocks in the basket that meet the criteria in equal 
weights 
> using all available cash (This I can do)
> - Somtimes there may be 20 and sometimes there may be 0.  However, 
> with every periodic review I need to rebalance as required. So, for 
> example, if stocks meeting the criteria went down from 5 to 4 I 
would 
> need to purchase additional shares of the 4 remaining on the list. 
> Alternatively I could go from 4 to 5 and need to trim the prior 4 
to 
> add the fifth stock. (This I can't figure out how to code.)
> 
> Also, would you even use rotational trading for this because you 
could 
> own anywhere from zero stocks to every stock on the list depending 
on 
> which met/didn't meet the criterion?  I suppose I could force sell 
> everything and simply repurchase each period, but I'd prefer to 
> backtest the way it would actually be implemented.
>
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