Graham,
Thx, with a bit more work I've almost got it.
I had to change the settings for trade entry and exit to "0" days delay in the
backtest setup window. When "Buy" was set to 1 day delay
it would exit 100% on scale out rather than 50%. When "Buy" was set to "0
day delay" it would scale out 50%. Similarily with Profit Targets and
Trailing Stops; days delayed has to be equal to "0" to get accurate numbers
otherwise the open from the next day was used. To do this I had to go with
taking all the trades at the close of the signal bar rather than the open of the
next bar which does make some difference in the calculation of trailing stops as
the high of the entry bar is used in the calcs and in real life you won't be
experiencing that high as you'll be entering after it. Not sure there is a
way around this but it'll have to do for now.
Just a clarification, what do you use for covering
a trade when you are short; "scalein" or "scaleout"?
Secondly, another problem has arisen and I have no
idea why. The backtest now only enters long trades and not any short
trades. Yes I have made sure the backtest is set for both long and short
trades. Got any ideas on this? The only changes I've made to my
program are mods to this portion that pertain to the scaling of trades.
I'm really stumped.
You've been a big help Graham,
thx,
Fred
----- Original Message -----
Sent: Wednesday, May 16, 2007 8:33
PM
Subject: Re: [amibroker] Re: Scale Out
Question
For entry and scaling in/out use Buy for long trades, Short for short
trades For exits Sell and Cover Because scaling uses Buy and Short you
need to define the buyprice and shortprice for the scaling
Sell[i] = 1;
defines Sell as one, ie exit the trade, similar for Cover[i]=1; for short
trade exit
-- Cheers Graham AB-Write >< Professional
AFL Writing Service Yes, I write AFL code to your requirements http://www.aflwriting.com
On 17/05/07, Ed
Middleton <jjj_98@xxxxxxcom> wrote:
Thx Graham, I'll give them a try. Just a
bit confused on why you use BuyPrice with sigscale out but if you look
further down in the code they use SellPrice when just closing all remaining
positions. Can you explain?
What does the Sell[i]=1 suppose to do? Is
this just for the long section of the code? Would you use Buy[i] = 1
for the Short side?
thx again,
Fred
-----
Original Message -----
Sent:
Wednesday, May 16, 2007 5:52 PM
Subject:
Re: [amibroker] Re: Scale Out Question
These may not be all the errors, but just a couple in quick
look
At the sigscale you should use BuyPrice
Buy[i] =
sigScaleOut; BuyPrice[i] = FirstProfitTarget + PriceAtBuy;
and
at teh exit you need to use Sell
if(Exit == 2) { Sell[i] =
1;
In your short section make sure you use Short and Cover, not Buy
and Sell
-- Cheers Graham AB-Write >< Professional
AFL Writing Service Yes, I write AFL code to your requirements http://www.aflwriting.com
On 17/05/07,
jjj_98 <jjj_98@xxxxxxcom> wrote: > Spent another
day on this problem. Very frustrated at this point. > Even when I
reduce the whole thing down to just the trailing stop > portion on
the buy side only it still does not work. Has anyone been > able to
get this code from the Pyramiding section of the website to > work?
Are there things missing in the code or has it been updated >
recently? Does this code need to follow or precede the > normal
"Buy", "Sell", "Short", "Cover" instructions in the code? > >
Any tidbit of advice on this would be very appreciated. > >
thx, > > Fred > > > > > --- In
amibroker@xxxxxxxxxps.com, "jjj_98"
<jjj_98@xxx> wrote: > > > > Hi, >
> > > Trying to scale out of a position in my code and used
the code from > > one of the articles on the AB website. What is
happening is that > the > > program does not recognize the
profit targets or trailing stops > that > > have been set
up in the code. At one point it was recognizing it, > > but not
correctly and when it scaled out it scaled out 100% rather > >
than 50%. > > > > I've spent a few hours trying to make
this work. I'd really > > appreciate it if anyone could take a
look at the portion of the > code > > in question below and
let me know if they see any obvious > problems. > > Yes, I
have defined TrailingStop and FirstProfitTarget parameters. >
> > > thx, > > > > PriceatBuy = 0; >
> PriceatShort = 0; > > HighSinceBuy = 0; > >
LowSinceShort = 0; > > Exit = 0; > > > > for( i
= 0; i < BarCount; i++) > > { > > if(PriceAtBuy == 0
AND Buy[i]) > > { > > PriceAtBuy = BuyPrice[i]; >
> } > > if(PriceAtBuy > 0) > > { > >
HighSinceBuy = Max(High[i] , HighSinceBuy); > > if(Exit == 0
AND High[i] >= (FirstProfitTarget + > > PriceAtBuy)) >
> { > > // first profit target hit - Scale Out > >
Exit = 1; > > Buy[i] = sigScaleOut; > > SellPrice[i] =
FirstProfitTarget + PriceAtBuy; > > > > } > >
if(Low[i] <= (HighSinceBuy - TrailingStop)) > > { >
> // trailing stop hit - exit > > Exit = 2; > >
SellPrice[i] = (HighSinceBuy - TrailingStop); > > } >
> if(Exit == 2) > > { > > Buy[i] = 0; > >
Exit = 0; > > PriceAtBuy = 0; > > HighSinceBuy =
0; > > } > > } > > > > if(PriceatShort
== 0 AND Short[i]) > > { > > PriceatShort =
ShortPrice[i]; > > } > > if(PriceatShort >
0) > > { > > LowSinceShort = Min(Low[i] ,
LowSinceShort); > > if(Exit == 0 AND Low[i] <=
(PriceatShort - > > FirstProfitTarget)) > >
{ > > // first profit target hit - Scale Out > > Exit =
1; > > Short[i] = sigScaleOut; > > } > >
if(High[i] >= (LowSinceShort + TrailingStop)) > >
{ > > // trailing stop hit - exit > > Exit = 2; >
> BuyPrice[i] = (LowSinceShort + TrailingStop); > >
} > > if(Exit == 2) > > { > > Short[i] =
0; > > Exit = 0; > > PriceatShort = 0; > >
LowSinceShort = 0; > > } > > > > } >
> > > } > >
SetPositionSize(50,spsPercentOfPosition*((Buy ==
sigScaleOut)+ > (Short > > ==
sigScaleOut))); > > //scale out of 50% of position >
> > > > > > Please note that this group
is for discussion between users only. > > To get support from
AmiBroker please send an e-mail directly to > SUPPORT {at} amibroker.com > > For NEW RELEASE
ANNOUNCEMENTS and other news always check DEVLOG: > http://www.amibroker.com/devlog/ > >
For other support material please check also: > http://www.amibroker.com/support.html > >
Yahoo! Groups
Links > > > >
Looking for earth-friendly autos? Browse Top Cars by "Green Rating" at Yahoo! Autos' Green
Center.
__._,_.___
Please note that this group is for discussion between users only.
To get support from AmiBroker please send an e-mail directly to
SUPPORT {at} amibroker.com
For NEW RELEASE ANNOUNCEMENTS and other news always check DEVLOG:
http://www.amibroker.com/devlog/
For other support material please check also:
http://www.amibroker.com/support.html
SPONSORED LINKS
__,_._,___
8:00? 8:25? 8:40? Find a flick in no time with theYahoo! Search movie showtime shortcut. |