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Re: [amibroker] Re: Comments on Backtesting



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Hello,

> From: <jvarn359@xxxx>

> --- In amibroker@xxxx, "Tomasz Janeczko" <tj@xxxx> wrote:
> 
> > During my own research I checked the performance of the very
> > same system on different groups of stocks and the results
> > was from loosing money on most of the trades to
> > outperforming B&H by 400%. The system clearly preferred
> > less volatile, blue chip stocks. 
> 
> How do you really know there is a true cause-and-effect relationship 
> between the system and the different groups? It might clearly *seem* 
> to be true but without rigorous statistical analysis you don't know 
> if your results are significant. Also, the results by group could be 
> dynamic -- perhaps in 2002 blue chips will be at the bottom instead 
> of on top.
Well, if you know the internals of all indicators and functions included in 
AmiBroker it is quite easy to predict which indicators will prefer
less volatile "smoother" price action and which won't.
You are right that one would need a statistical test over huge
probe to prove it but my task is not to prove anything.
The only thing important for me is that I have confidence in my system
because I know HOW and WHY it works.


Best regards,
Tomasz Janeczko
===============
AmiBroker - the comprehensive share manager.
http://www.amibroker.com