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Yup - you were right - the issue was I wasn't allowing position
shrinking....thanks for the further detail.
--- In amibroker@xxxxxxxxxxxxxxx, "Ron Rowland" <rowland@xxx> wrote:
>
> My approach should not create any gaps in the account. It probably
> has to do with some of the other AA options. I also have:
>
> SetBacktestMode(backtestRotational);
> SetTradeDelays(1,1,1,1); // everything delayed 1 day
> SetOption("UsePrevBarEquityForPosSizing", True);
> SetOption("MinShares", 0);
> SetOption("AllowPositionShrinking",True);
>
> LastDayOfMonth = IIf(Day() > Ref(Day(),1),1,0);
> PositionScore = IIf(LastDayOfMonth, PositionScore, scoreNoRotate);
>
>
>
> --- In amibroker@xxxxxxxxxxxxxxx, "droskill" <droskill@> wrote:
> >
> > Well, I thought I had it, but I was looking over the trades done
> using
> > Ron's method below, and it creates gaps in the account. In other
> > words, there are times when you get an exit and then there is a
> delay
> > before the next entry. As a reminder, what I'm trying to do here is
> > make it so that rebalancing ONLY happens on the first day of the
> month
> > - so both entries and exit. I'm including my now greatly simplified
> > AFL to see if anyone has any ideas.
> >
> > EnableRotationalTrading();
> > EachPosPercent = 100; //We want to rotate to only one position
> >
> > PositionScore = 1000 + ROC (C, 20) //Long only
> >
> > PositionSize = -EachPosPercent;
> >
> > SetOption("WorstRankHeld", 1 );
> > SetOption("MaxOpenPositions", 1 );
> > SetOption("UseCustomBacktestProc", True );
> >
> > if( Status("action") == actionPortfolio )
> > {
> > bo = GetBacktesterObject();
> >
> > bo.PreProcess(); // Initialize backtester
> >
> > mo = Month();
> > dy = Day();
> > monthchange = mo != Ref( mo, -1 );
> > sma = MA(C,200);
> > Cls = C;
> >
> > for(bar=0; bar < BarCount; bar++)
> > {
> >
> > if ( monthchange[ bar ] AND dy[ bar ] < 3 )
> > {
> > bo.ProcessTradeSignals( bar );
> > }
> > }
> > bo.PostProcess(); // Finalize backtester
> > }
> >
> >
> > --- In amibroker@xxxxxxxxxxxxxxx, "droskill" <droskill@> wrote:
> > >
> > > Ron - thanks - that's much simpler - appreciate your help.
> > >
> > > Question - the Ref(Day(),1) portion of the IIF - is that
> referencing
> > > the day before or the day after?
> > >
> > > --- In amibroker@xxxxxxxxxxxxxxx, "Ron Rowland" <rowland@> wrote:
> > > >
> > > > I'm sorry I didn't see this thread earlier. I have a simple
> two line
> > > > approach to this problem:
> > > >
> > > > LastDayOfMonth = IIf(Day() > Ref(Day(),1),1,0);
> > > > PositionScore = IIf(LastDayOfMonth, PositionScore,
> scoreNoRotate);
> > > >
> > > > I also have trade delays set for one day. Using the above then
> > > > allows all securities to be analyzed with daily data on the
> last day
> > > > of the month with the trade taking place on the first day of
> the
> > > > following month.
> > > >
> > > > --- In amibroker@xxxxxxxxxxxxxxx, "droskill" <droskill@> wrote:
> > > > >
> > > > > In the interest of the group which has been so helpful, I'm
> posting
> > > > > the code change that worked - that makes the rotation happen
> only on
> > > > > the first trading day of the month - comments/critique
> welcome.
> > > > >
> > > > > EnableRotationalTrading();
> > > > > EachPosPercent = 25;
> > > > >
> > > > > PositionScore = 1000 + ROC (C, 20);
> > > > >
> > > > > PositionSize = -EachPosPercent;
> > > > >
> > > > > SetOption("WorstRankHeld", 4 );
> > > > > SetOption("MaxOpenPositions", 4 );
> > > > > SetOption("UseCustomBacktestProc", True );
> > > > >
> > > > > if( Status("action") == actionPortfolio )
> > > > > {
> > > > > bo = GetBacktesterObject();
> > > > >
> > > > > bo.PreProcess(); // Initialize backtester
> > > > >
> > > > > mo = Month();
> > > > > dy = Day();
> > > > > monthchange = mo != Ref( mo, -1 );
> > > > >
> > > > > for(bar=0; bar < BarCount; bar++)
> > > > > {
> > > > >
> > > > > if ( monthchange[ bar ] AND dy[ bar ] < 3 )
> > > > > {
> > > > > bo.ProcessTradeSignals( bar );
> > > > > }
> > > > > if( monthchange[ bar ] AND dy[ bar ] < 3 )
> > > > > {
> > > > > CurEquity = bo.Equity;
> > > > >
> > > > > for( pos = bo.GetFirstOpenPos(); pos;
> pos =
> > > > bo.GetNextOpenPos() )
> > > > > {
> > > > > posval = pos.GetPositionValue();
> > > > >
> > > > > diff = posval - 0.01 * EachPosPercent
> *
> > > > CurEquity;
> > > > > price = pos.GetPrice( bar, "O" );
> > > > >
> > > > > // rebalance only if difference between desired and
> > > > > // current position value is greater than 0.5% of equity
> > > > > // and greater than price of single share
> > > > > if( diff != 0 AND
> > > > > abs( diff ) > 0.005 * CurEquity AND
> > > > > abs( diff ) > price )
> > > > > {
> > > > > bo.ScaleTrade( bar, pos.Symbol, diff
> < 0,
> > > > price, abs( diff ) );
> > > > > }
> > > > > }
> > > > > }
> > > > > }
> > > > > bo.PostProcess(); // Finalize backtester
> > > > > }}
> > > > >
> > > > > --- In amibroker@xxxxxxxxxxxxxxx, "Tomasz Janeczko" <groups@>
> wrote:
> > > > > >
> > > > > > Hello,
> > > > > >
> > > > > > Taking the example and modifying it to fit your
> requirements is
> > > > just
> > > > > a matter
> > > > > > of minutes ! Don't be lazy.
> > > > > >
> > > > > > EnableRotationalTrading();
> > > > > > EachPosPercent = 5;
> > > > > >
> > > > > > PositionScore = ROC( C, 20 );
> > > > > >
> > > > > > PositionSize = -EachPosPercent;
> > > > > >
> > > > > > SetOption("WorstRankHeld", 40 );
> > > > > > SetOption("MaxOpenPositions", 20 );
> > > > > >
> > > > > > SetOption("UseCustomBacktestProc", True );
> > > > > >
> > > > > > if( Status("action") == actionPortfolio )
> > > > > > {
> > > > > > bo = GetBacktesterObject();
> > > > > >
> > > > > > bo.PreProcess(); // Initialize backtester
> > > > > >
> > > > > > mo = Month();
> > > > > >
> > > > > > monthchange = mo != Ref( mo, -1 );
> > > > > >
> > > > > >
> > > > > > for(bar=0; bar < BarCount; bar++)
> > > > > > {
> > > > > > bo.ProcessTradeSignals( bar );
> > > > > >
> > > > > >
> > > > > > if( monthchange[ bar ] )
> > > > > > {
> > > > > > CurEquity = bo.Equity;
> > > > > >
> > > > > > for( pos = bo.GetFirstOpenPos(); pos; pos =
> bo.GetNextOpenPos
> > > > () )
> > > > > > {
> > > > > > posval = pos.GetPositionValue();
> > > > > >
> > > > > > diff = posval - 0.01 * EachPosPercent * CurEquity;
> > > > > > price = pos.GetPrice( bar, "O" );
> > > > > >
> > > > > > // rebalance only if difference between desired and
> > > > > > // current position value is greater than 0.5% of equity
> > > > > > // and greater than price of single share
> > > > > > if( diff != 0 AND
> > > > > > abs( diff ) > 0.005 * CurEquity AND
> > > > > > abs( diff ) > price )
> > > > > > {
> > > > > > bo.ScaleTrade( bar, pos.Symbol, diff < 0, price, abs(
> > > > diff ) );
> > > > > > }
> > > > > > }
> > > > > >
> > > > > > }
> > > > > > }
> > > > > > bo.PostProcess(); // Finalize backtester
> > > > > > }
> > > > > >
> > > > > >
> > > > > > Best regards,
> > > > > > Tomasz Janeczko
> > > > > > amibroker.com
> > > > > > ----- Original Message -----
> > > > > > From: "droskill" <droskill@>
> > > > > > To: <amibroker@xxxxxxxxxxxxxxx>
> > > > > > Sent: Saturday, March 15, 2008 10:34 PM
> > > > > > Subject: [amibroker] Re: Portfolio rotation
> > > > > >
> > > > > >
> > > > > > > This example shows rebalancing to a fixed % at any time -
> is
> > > > there an
> > > > > > > example that shows rebalancing on a specific day - I'm
> trying to
> > > > > > > rebalance on a first trading day of the week or month.
> > > > > > >
> > > > > > > Any help greatly appreciated Tomasz!
> > > > > > >
> > > > > > > --- In amibroker@xxxxxxxxxxxxxxx, "Tomasz Janeczko"
> <groups@>
> > > > wrote:
> > > > > > >>
> > > > > > >> Yes you can and there is an example code posted:
> > > > > > >> http://www.amibroker.com/kb/2006/03/06/re-balancing-open-
> > > > positions/
> > > > > > >>
> > > > > > >>
> > > > > > >> Best regards,
> > > > > > >> Tomasz Janeczko
> > > > > > >> amibroker.com
> > > > > > >> ----- Original Message -----
> > > > > > >> From: "droskill" <droskill@>
> > > > > > >> To: <amibroker@xxxxxxxxxxxxxxx>
> > > > > > >> Sent: Saturday, March 15, 2008 5:34 PM
> > > > > > >> Subject: [amibroker] Portfolio rotation
> > > > > > >>
> > > > > > >>
> > > > > > >> > Hey all - I've been looking at the automatic portfolio
> > > > rotation
> > > > > > >> > feature of AB, and I had a question - if I want to
> control
> > > > the time
> > > > > > >> > element of the rotation, would I have to use the
> regular
> > > > > backtester?
> > > > > > >> >
> > > > > > >> > In other words, let's imagine that instead of
> rebalancing
> > > > > "on-demand"
> > > > > > >> > - let's imagine that I want to only rebalance once per
> week
> > > > or once
> > > > > > >> > per month - can I do this with the rotational
> portfolio?
> > > > > > >> >
> > > > > > >> > Thanks!
> > > > > > >> >
> > > > > > >> >
> > > > > > >> >
> > > > > > >
> > > > >
> > > >
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> directly
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