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<SPAN
class=487502012-14122003>Yes, of course, you're right. Even if the backtester
removes redundant signals before atually trading, if your code needs to know
when the last entry happened, or the BuyPrice at that time, etc., you need to
remove them yourself before looking for those kinds of
infos.
<SPAN
class=487502012-14122003>
<SPAN
class=487502012-14122003>Dave
<BLOCKQUOTE
>
The one main area
where the additional buy signals cause a problem is when your sell is related
to the buy signal either by time or price. The sell will recognise the
additional buy signals and reset its calculation based on that. This can cause
the sell to move further out, or in event of applystop could bring it
sooner, than would otherwise be the case. This would make your
backtesting produce unreal results. Of course this would not be the case if
you use the additional buy signals within your trade
plan.
<FONT face="Courier New"
color=#0000ff>
<SPAN
class=487502012-14122003> Cheers,Graham<A
href=""><FONT
size=2>http://groups.msn.com/asxsharetrading<A
href=""><FONT
size=2>http://groups.msn.com/fmsaustralia
<FONT
face=Tahoma size=2>-----Original Message-----From: Dave Merrill
[mailto:dmerrill@xxxxxxx] Sent: Sunday, 14 December 2003 8:03
PMTo: amibroker@xxxxxxxxxxxxxxxSubject: RE:
[amibroker] Re: Exrem - Buy Only
<SPAN
class=954244711-14122003>Are you saying that you've actually seen the
backtester take more than one consecutive buy or sell on the same stock in a
row, without an intervening opposite signal?!? I haven't, ever. I suppose
it's possible I didn't notice a rare exception, but I bet someone would
have.
<SPAN
class=954244711-14122003>
<SPAN
class=954244711-14122003>Or maybe you've seen the backtester take a signal
other than the first of consecutive signals in the same direction? That I'm
less certain I haven't seen, but I am quite sure I'd call that a bug. Is
that not so? Can you point me to somewhere in the docs or something Tomasz
has said that indicates otherwise? Where ExRem-ing trade signals is
said to be *required* for proper operation? I'd think that would be an
important piece of info to mention, say, in the docs for
ExRem.
<SPAN
class=954244711-14122003>
<SPAN
class=954244711-14122003>One piece of evidence that the backtester does
this, and is supposed to, is in the docs for the Equity function, describing
the behavior of Flag (1st parameter) value 1:
<SPAN
class=954244711-14122003>
<FONT
face="Courier New">"works as 0 but additionally
updates buy/sell/short/cover arrays so all
redundant signals are removed <FONT
color=#ff0000>exactly as it is done internally by the
backtester plus all exits by stops are applied so it is
now possible to visualise ApplyStop()
stops."
<SPAN
class=954244711-14122003>
<SPAN
class=954244711-14122003>Dave
<BLOCKQUOTE
><which
the backtester does automatically anyway>Dave,I'm
pretty sure that the backtester does NOT automatically do as you
say.I've spent quite a lot of time working with the backtester,
anddetermined that I *ALWAYS* need to perform the ExRem functions
myselfin order to have absolute control over the last Buy, Sell, Short
&Cover signals.Whether I'm right or wrong, by taking
absolute control over thesesignals, there is no question about the
sequence of events related tothese
signals.Regards,Phsst
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