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[amibroker] Re: Robustness Criteria, Condensed 1-5. was Robustness, Post #1



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Mark,

In particular what you have in mind by "simulation" ...

--- In amibroker@xxxxxxxxxxxxxxx, "Fred" <fctonetti@xxxx> wrote:
> Mark,
> 
> Can you add a few more words behind #4 & 5 ?
> 
> --- In amibroker@xxxxxxxxxxxxxxx, "quanttrader714" 
> <quanttrader714@xxxx> wrote:
> > Robustness Criteria, Condensed 1-5.
> > 
> > 1. Test on small, mid & large cap stocks in bull, bear & sideways
> > markets.  
> > 2. Evaluate performance on top 20% most actively traded small, 
mid &
> > large cap stocks.
> > 3. Graph and evaluate system performance consistency (%
profit/trade
> > and % profit/bar) on select stocks.
> > 4. Perform simulation to estimate probability of profit in 10 
trades
> > (for select stocks).
> > 5. Perform simulation to estimate future drawdown (for select 
> stocks).
> > 
> > --- In amibroker@xxxxxxxxxxxxxxx, "Fred" <fctonetti@xxxx> wrote:
> > > At the moment I'd settle for having a one line description of 
#2 -
> > #8.
> > > 
> > > --- In amibroker@xxxxxxxxxxxxxxx, "leonardot19" 
> > <leo.timmermans@xxxx> 
> > > wrote:
> > > > Hi Anthony, Mark,
> > > > 
> > > > This is a good idea. This will allow for the less gifted, 
like 
> > > myself 
> > > > (lol) to follow more closely.
> > > > 
> > > > Thanks
> > > > Leo
> > > > 
> > > > 
> > > > --- In amibroker@xxxxxxxxxxxxxxx, "Anthony Faragasso" 
> > > <ajf1111@xxxx> 
> > > > wrote:
> > > > > Mark,
> > > > > 
> > > > > Thanks for the thread....How about exploring each of your 9 
> > > points 
> > > > of
> > > > > Robustness with a sample simple System....then (you / we ) 
> can 
> > > > apply each
> > > > > point to this sample system....with your direction....and
> > discuss 
> > > > why this
> > > > > system would be accepted or not as pertains to the specific 
> > > point...
> > > > > 
> > > > > Anthony
> > > > > 
> > > > > 
> > > > > ----- Original Message ----- 
> > > > > From: "quanttrader714" <quanttrader714@xxxx>
> > > > > To: <amibroker@xxxxxxxxxxxxxxx>
> > > > > Sent: Sunday, November 02, 2003 11:13 AM
> > > > > Subject: [amibroker] Re: On Robustness, Post #1
> > > > > 
> > > > > 
> > > > > > Hi Dale,
> > > > > >
> > > > > > Good question.  When someone posts something and I want 
to 
> > > check 
> > > > it
> > > > > > out (I actually run at least the lite version on almost 
> > > everything
> > > > > > posted here), I initially use their numbers.  If I want 
to 
> > > explore
> > > > > > further I optimize (lol) the system on a different 
> database, 
> > > plot 
> > > > the
> > > > > > optimized parameters against performance measures and 
choose
> > a 
> > > set
> > > > > > of values that seems robust by eyeballing the graphs.  
When 
> I
> > > > > > wrote: "Test *unoptimized* system on small, mid & large 
cap 
> > > > stocks in
> > > > > > bull, bear & sideways market conditions, same parameters 
> for 
> > > all" 
> > > > I
> > > > > > was really trying to say, don't make a special case for 
> each 
> > > mkt 
> > > > cap
> > > > > > and mkt condition subtest by optimizing, use the same 
> > > parameters 
> > > > for
> > > > > > all subtests.
> > > > > >
> > > > > > Regards,
> > > > > >
> > > > > > Mark
> > > > > >
> > > > > > --- In amibroker@xxxxxxxxxxxxxxx, "dingo" <dingo@xxxx> 
> wrote:
> > > > > > > Thanks for the post MF2!
> > > > > > >
> > > > > > > Given Steve's example of the CMO5 which I assume is 
coded
> > to 
> > > > detect
> > > > > > the
> > > > > > > cross of the indicator thru a value, how would you
> > determine 
> > > > that
> > > > > > value
> > > > > > > for your intial testing?  This is the case below where 
> you 
> > > > say "Test
> > > > > > > *unoptimized* system on small, mid & large cap stocks 
in 
> > > bull, 
> > > > bear
> > > > > > &
> > > > > > > sideways market conditions, same parameters for all"
> > > > > > >
> > > > > > > Thanks!
> > > > > > >
> > > > > > > d
> > > > > > >
> > > > > > > -----Original Message-----
> > > > > > > From: MarkF2 [mailto:feierstein@x...]
> > > > > > > Sent: Saturday, November 01, 2003 2:50 PM
> > > > > > > To: amibroker@xxxxxxxxxxxxxxx
> > > > > > > Subject: [amibroker] On Robustness, Post #1
> > > > > > >
> > > > > > >
> > > > > > > This is in response to DT's and others' requests to 
> provide 
> > > more
> > > > > > > details on my 9 robustness criteria.
> > > > > > >
> > > > > > > First some administrative anouncements, lol.  I've 
decided
> > to
> > > > > > provide
> > > > > > > them one-by-one, first due to my time constraints, 
second 
> > > > because I
> > > > > > > feel that's the best way to discuss them and third 
because
> > I 
> > > > want
> > > > > > to
> > > > > > > see how this goes.  I welcome all constructive debate, 
> > > > especially
> > > > > > > opposing views supported by quantitative analysis.  But 
> if 
> > > this
> > > > > > > degenerates into a flame war, I've got better things to 
> do 
> > > with 
> > > > my
> > > > > > > time.  Treat me with respect and I'll treat you with
> > respect.
> > > > > > There
> > > > > > > seems to be a lot of interest in this topic, so let's
> > please 
> > > > have a
> > > > > > > collegial and productive discussion.  This is post 1 of 
9
> > (not
> > > > > > > counting the dialog inbetween, let's see how far we can 
> get
> > :-
> > > ).
> > > > > > >
> > > > > > > Why care about robustness?  For whatever reasons, 
markets 
> > > > change.
> > > > > > We
> > > > > > > could spin our wheels forever discussing time series
> > theory, 
> > > > serial
> > > > > > > dependencies, random walk, nonstationarity, etc., like 
> > > > academicians
> > > > > > > do and get nowhere (as they do), or we can try to cut
> > through 
> > > > the
> > > > > > crap
> > > > > > > and deal with it (the simple fact that markets 
constantly 
> > > > change).
> > > > > > > My weapon of choice is robustness.  You could say I 
have a
> > > > > > robustness
> > > > > > > obsession and my criteria are overkill.  But that's my
> > choice 
> > > > and
> > > > > > > you're free to make your own on how far you want to 
take 
> > > this, 
> > > > if
> > > > > > at
> > > > > > > all.
> > > > > > >
> > > > > > > OK, I lied.  There will be some, very light discussion 
of
> > > > > > statistics
> > > > > > > because some criteria are steeped in statistical 
theory. 
> > But 
> > > > most
> > > > > > > can be reduced to simple, mechanical procedures that 
can 
> be 
> > > > graphed
> > > > > > in
> > > > > > > a spreadsheet and visually and intuitively 
interpreted.  
> > > Others
> > > > > > > require simulation software and one requires 
proprietary 
> > > > software
> > > > > > but
> > > > > > > we'll cross that bridge when we come to it.
> > > > > > >
> > > > > > > Speaking of proprietary, there are some things I simply
> > won't
> > > > > > > disclose, such as specific parameters for certain 
> criteria.
> >  
> > > So
> > > > > > please
> > > > > > > respect my wishes and don't ask.  I have my reasons.  
So 
> > > > evaluate
> > > > > > this
> > > > > > > on your own and decide for yourself what place, if any, 
> the 
> > > > criteria
> > > > > > > have in your trading.  They work great for me but I 
make 
> no 
> > > > claim
> > > > > > that
> > > > > > > they're the Holy Grail of robustness and am sure that 
some
> > of 
> > > > you
> > > > > > will
> > > > > > > come up with better ideas if there's enough interest and
> > > > > > discussion.
> > > > > > >
> > > > > > > With that long winded intro, here's Criterion #1:
> > > > > > >
> > > > > > > Test *unoptimized* system on small, mid & large cap 
stocks
> > in 
> > > > bull,
> > > > > > > bear & sideways market conditions, same parameters for 
> all.
> >  
> > > I 
> > > > use
> > > > > > > the stocks of the S&P 600, 400, and 500 indices and 2 
> year 
> > > bull,
> > > > > > bear
> > > > > > > and sideways periods (for a total of 6 years per 
stock).  
> > > > Rationale
> > > > > > > behind this: to find systems that profitably *tested 
out 
> in 
> > > the
> > > > > > past*
> > > > > > > on a large number of (somewhat tradeable) stocks of 
> varying 
> > > > market
> > > > > > > caps in multiple sectors under different market 
> conditions, 
> > > > under
> > > > > > the
> > > > > > > assumption that this indicates the system is robust 
enough
> > to
> > > > > > > profitably *trade select issues in the future*.  More 
on 
> > > robust
> > > > > > issue
> > > > > > > selection in later criteria. Looking for net 
profitability
> > on 
> > > > all
> > > > > > mkt
> > > > > > > cap and mkt condition subtests, and profitable on the 
> > > majority 
> > > > (>
> > > > > > > 50%) of issues in each subtest, the more the better.  
> > > Sometimes 
> > > > I
> > > > > > cut
> > > > > > > a system some slack if it's close on one or two 
subtests, 
> > > it's a
> > > > > > > judgement call.  My commission setting(s) in AB:
> > proprietary, 
> > > > based
> > > > > > > on my *slippage* research using data from actual 
trades. 
> > But 
> > > > you
> > > > > > > could choose an arbitrary say, 1% to get started.  Date 
> > > > settings for
> > > > > > > my 2 year intervals: proprietary but you can easily find
> > your 
> > > > own
> > > > > > by
> > > > > > > eyeballing a chart of a major index.  Just use the same
> > ones 
> > > > each
> > > > > > > time so you compare apples to apples.   My lite version 
> of 
> > > this 
> > > > is 2
> > > > > > > year bull and bear periods on the ND100 and SP100 
stocks, 
> > > which 
> > > > I
> > > > > > > sometimes run as a quick pre-screen. Next time someone
> > posts a
> > > > > > system,
> > > > > > > run it through the lite or full version.  Or test the
> > systems 
> > > > in the
> > > > > > > AFL library.  The more systems you run through, the 
more 
> > > > intuitive
> > > > > > of
> > > > > > > a feel for robustness you'll get.  Note that I'm *not*
> > saying 
> > > > you
> > > > > > > shouldn't or can't successfully trade something that
> > doesn't 
> > > > meet
> > > > > > > this standard, lol.  That's obviously not true!  I was
> > asked 
> > > to
> > > > > > > explain my robustness criteria and that's what I'm 
> doing.  
> > > > Period.
> > > > > > > This criterion is a post-Amibroker creation, BTW.  Pre-
> > > > Amibroker I
> > > > > > had
> > > > > > > a small test portfolio of diverse issues I used instead 
> and 
> > > it 
> > > > did a
> > > > > > > decent job. I run this now because I now (easily) can,
> > *many* 
> > > > thanks
> > > > > > > to Tomasz.  If you're thinking, geez, why bother with 
> this, 
> > > ask
> > > > > > > yourself a simple question. *All else being equal*, 
would
> > you 
> > > > feel
> > > > > > > more confident trading (with your money) a system that
> > passes 
> > > > this
> > > > > > > test or one that fails it?
> > > > > > >
> > > > > > > Regards,
> > > > > > >
> > > > > > > Mark
> > > > > > >
> > > > > > >
> > > > > > >
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