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Jack
As long as you're aware of the ZZ problems then it's up to you how you use
it and any related functions.
About three years ago I back-tested a peak/trough based system designed for
mutual funds on my EOD stock database. The results were better than anything
I had seen up to that time so I re-tested each days entries right through a
two year period. About 45% of the entry signals when there was no forward
data disappeared once more data was added. The same problem may be much less
of an issue in other markets but I'm not a fan of the "random entry" method
and I came to the conclusion that ZigZag is definitely not for me.
Sorry I can't be more constructive. I'm still interested in solving the
underlying problem of picking up a series of specific price movements but
I'm uncomfortable about using ZZ based function outputs as reference points
for the initial price. Irrational perhaps, but I guess we all have our
foibles. I've found that a PREV based latch has myriad uses in MS, I just
haven't figured out how to use it to get accurate signals for 1% moves.
Roy
> Thanks for the help on the code, Roy. I hope to have a pretty good
> working code shortly.
>
> I'm aware of the dynamic nature of the zigzag, especially on EOD
> data. I've read dozens of articles on it and various ways to handle
> the problems it can create. On intraday screens like 1, 5, 15 and 30
> minute time frames, I've tracked a zigzag function based on peak and
> trough bars and have found the movement of the indicator to be
> reasonable at the shorter distances between the price and the swing
> point, 1%, 2%, etc. The false readings and shifts seemed to be
> minimal. Obviously on those small distances you would get a lot of
> false trend changes. In this case 1% is my starting point. For what
> I'm doing it may drop to as low as 0.25%.
>
> On a few occasions I have recorded the first sign of the zigzag
> signal and then how many stayed stable intially and then how long it
> took for the rest to find their stablility point. Basically, the data
> I have collected seems to suggest that at the short distances and in
> tighter time frames, the dynamic nature of the indicator does not
> pose much of a problem. (At least that's what I've come up with. I
> may not have done my data collection properly. It's a little tricky.)
>
> Based on that and the fact that this portion of the expert is not
> giving entry signals, just approximate price changes, I thought it
> would work well enough in this application. However, I would like to
> find another method of doing the same thing, if I can work out the
> code.
>
> I'll keep playing around with what you've given me and see where I
> can take it. I'm not the best programmer. Everything has to be
> learned by trial and error because the information MS provides is so
> minimal.
>
> I certainly agree with you that the zigzag should never be used on
> EOD and for back testing a system. That's worthless. However, I have
> noticed a lot of commentary on this board and other boards that lead
> me to believe a lot of people have a negative view of the peak,
> trough and zigzag, yet they don't really understand under what
> context their views should apply. I guess everyone interprets
> whatever they've read as gospel without doing any application testing
> themselves. I suppose the topic is always debatable. I've read a few
> comments that have lead me to believe the debate is over, and all the
> definitive analysis has been done--end of story. I don't think so,
> but I'll never change their minds.
>
> Those invisible zigzag signals are always hard to deal with, but one
> of the tests I've done is to capture live charts with the peak and
> trough function alone and with validated peak and trough functions
> for comparison. Those results are interesting.
>
> Thanks again for helping. I'm getting to be a better all the time but
> it's slow going. I have a lot ideas I can't code up yet so I have to
> do things in a much less efficient way.
>
> Jack
>
>
>
>
> --- In equismetastock@xxxxxxxxxxxxxxx, "Roy Larsen" <rlarsen@xxxx>
> wrote:
> > Jack
> >
> > I don't think using ZigZag is a good idea. Even if you get code
> that appears
> > to do just what you want the dynamic nature of ZZ makes it
> virtually useless
> > IMO.
> >
> > I feel that using rock solid code like that below to track prices
> moving
> > favourably is a better way to go. I haven't cracked how to signal
> moves
> > across new 1% boundaries yet, but once the entry price is locked in
> it's
> > just a technicality. The solution won't be too far away.
> >
> > {Long Trade Move}
> > N:=If(Fml("PS Fractal Entry")>0,C,0);
> > X:=If(Fml("PS Fractal Exit")>0,C,0);
> > Tl:=If(PREV<=0,N,If(C>PREV,Max(C,PREV),If(X>0,0,PREV)));
> > El:=Valuewhen(1,Tl>0 and Alert(Tl=0,2),Tl);
> > Tl; El;
> > {Short Trade Move}
> > Ts:=If(PREV=0,X,If(C<PREV,Min(C,PREV),If(N>0,0,PREV)));
> > Es:=Valuewhen(1,Ts>0 and Alert(Ts=0,2),Ts);
> > Ts; Es;
> >
> > Roy
> >
> > > The problem with what I wrote is it doesn't produce an exact
> > > crossover at the grid lines. In other words it passes across a
> grid
> > > line without ever having an exact value of 1.0, for example. The
> > > reason is the time frame. If it's a five minute chart the next
> bar on
> > > a five minute chart is five minutes away which means the indicator
> > > value jumps from where it was at bar1 to where it is at bar2, five
> > > minutes apart. It makes it tough to find a formula that captures
> the
> > > right values.
> > >
> > > For whatever reason the indicator does not work on a 1 minute
> chart,
> > > so that's not an option. It works good on 10 min and 15 min
> charts.
> > >
> > > What do you think!
> > >
> > > Jack
> > >
> > >
> > >
> > > To unsubscribe from this group, send an email to:
> > > equismetastock-unsubscribe@xxxxxxxxxxxxxxx
> > >
> > >
> > >
> > > Your use of Yahoo! Groups is subject to
> http://docs.yahoo.com/info/terms/
> > >
> > >
> > >
>
>
>
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>
>
>
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>
>
>
>
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