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Objective functions (was RE: [amibroker] Re: Optimization -- again)



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Hi,

I don't have any hidden agenda other than world domination...(Just 
kidding)..

Regards,

Pal
--- In amibroker@xxxxxxxxxxxxxxx, "Phsst" <phsst@xxxx> wrote:
> Pal,
> 
> Thinking about it, you are not unique in my internet experiences.
> 
> You have your own agenda and you are feeding off of the negative
> reactions that you generate from others.
> 
> Whatever your agenda... good luck. I'll just ignore you from this
> point on. (Wish I'd recognized it for what it was earlier).
> 
> Phsst 
> 
> --- In amibroker@xxxxxxxxxxxxxxx, "Phsst" <phsst@xxxx> wrote:
> > <I have solved the universal market prediction problem for all 
markets
> > for all time.>
> > 
> > No kidding...
> > 
> > Pal... Your talents might be wasted here. This is an AB related 
forum
> > where the rest of us are focused upon AB and its capabilities.
> > 
> > Unlike you, I have NOT solved the universal market predition 
problem
> > for all markets for all time, and your previous posts don't seem 
to
> > indicate that you are willing to share your secrets related to 
this
> > interesting subject (other than it is moving average based). 
> > 
> > As I recall, you started this thread out by hero worshiping Larry
> > Williams, only to make an amazing revelation that you have this
> > universally capable predictive system of your own in place.
> > 
> > I hope you are getting something positive out of this... (I'm 
not).
> > 
> > Phsst
> > --- In amibroker@xxxxxxxxxxxxxxx, "palsanand" <palsanand@xxxx> 
wrote:
> > > Hi,
> > > 
> > > > If I discover a good system to trade the S&P futures, I will 
> > > certainly not
> > > > toss it aside if it performs poorly on Soy Beans.  Generalize 
this 
> > > to any
> > > > two markets.  It only takes a few good trading system / 
market 
> > > combinations
> > > > to be a winning trader.  There is no need to solve the 
universal 
> > > market
> > > > prediction problem for all markets for all time.  
> > >  
> > > Maybe you would not toss it away, but I would.  I have solved 
the  
> > > universal market prediction problem for all markets for all 
time.
> > >  
> > > > To use the breakout system you mention specifically, breakout 
> > > systems used
> > > > to work very well on futures; they now work poorly on 
futures; they 
> > > do not
> > > > work at all on most stocks.  Please code up an example 
breakout 
> > > system in
> > > > afl, run it on futures data from 1970 on and on stock data.  
If you 
> > > find
> > > > something good, report it back to us all.
> > > 
> > > I have used breakout systems (not the specific one in the 
example) 
> > > successfully regardless of the type of market and I don't have 
time 
> > > to do the experiment you suggested...
> > > 
> > > Regards,
> > > 
> > > Pal
> > > 
> > > >  
> > > > 
> > > > -----Original Message-----
> > > > From: palsanand [mailto:palsanand@x...] 
> > > > Sent: Monday, October 20, 2003 8:43 AM
> > > > To: amibroker@xxxxxxxxxxxxxxx
> > > > Subject: Objective functions (was RE: [amibroker] Re: 
Optimization -
> > > - again)
> > > > 
> > > >  
> > > > 
> > > > Hi,
> > > > 
> > > > In my mind, curve fitting means either using different 
systems for 
> > > > different markets, or using different parameters of the same 
system 
> > > > for different markets, and this is not valid technical 
analysis.
> > > > 
> > > > Historical testing via computer means feeding a set of 
numbers 
> > > (open, 
> > > > ow, close prices), and receiving back an output set of rules 
that 
> > > > hopefully will make money trading. The numbers themselves do 
not 
> > > have 
> > > > names, and the computer doesn't recognize the difference 
> > > > between 'Beans' or 'Bonds'. For a system to be valid, it must 
work 
> > > on 
> > > > all numbers tested, not just those with certain names and not 
> > > others 
> > > > with different names.
> > > > 
> > > > If a system works on Bonds and not on Beans, this system is 
curve 
> > > > fitted over a specific set of data (Bonds) and it loses all 
> > > > statistical validity. To believe it will work in the future 
as it 
> > > has 
> > > > worked in the past is very dangerous.
> > > > 
> > > > Also, different markets do not have different personalities. 
Again, 
> > > > they are reduced to just being a set of numbers or a bunch of 
> > > > algorithms. If a channel breakout (or any other) method is 
> > > > successful, then the same parameter must be used for all the 
> > > markets, 
> > > > for the same reasons as above. You cannot use a 20-day 
channel in 
> > > > Silver and a 40-day channel in Corn, this also falls under 
the 
> > > crime 
> > > > of curve fitting.
> > > > 
> > > > I therefore take exception to any system, that either only 
trades 
> > > one 
> > > > specific market or group of markets, or trades different 
markets 
> > > > using different parameters or rules of the same system. All 
this 
> > > > proves is what has worked best in the past, and this will 
usually 
> > > not 
> > > > continue to work in the future, as there is no correlation 
under 
> > > this 
> > > > scenario.
> > > > 
> > > > This is not specifically written to condemn vendors. This is 
a 
> > > > clarification of my definitions of 'optimizing' and 'curve 
> > > fitting', 
> > > > and a warning as to what types of trading systems may be 
valid and 
> > > > what to stay away from.
> > > > 
> > > > Regards,
> > > > 
> > > > Pal
> > > > 
> > > >  
> > > > 
> > > > <<<<<<<<<  SNIP >>>>>>>>>>>>>


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