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Zigzag is forward looking.
shahariar4 wrote:
>
>
> Could any one here pls tell me if the following code is a forward
> looking code? I have checked it with the Amibroker's code check tool
> and there it says it does not refer future quotes but while using in
> practical life it seems it references/uses future values....can any
> one pls check and tell whats the things about it...
>
> _SECTION_BEGIN("Zig Zag Spike");
> //----------------------------------------------------------
> //
> // Formula Name: Zig Zag
> // Author/Uploader: Jeff
> // E-mail: jparent@xxxxxxxxx <mailto:jparent%40nobid.com>
> // Date/Time Added: 2005-06-14 22:15:57
> // Origin:
> // Keywords:
> // Level: medium
> // Flags: indicator
> // Formula URL: http://www.amibroker.com/library/formula.php?id=472
> <http://www.amibroker.com/library/formula.php?id=472>
> // Details URL: http://www.amibroker.com/library/detail.php?id=472
> <http://www.amibroker.com/library/detail.php?id=472>
> //
> //----------------------------------------------------------
> //
> // normal zig zag with following differences:
> //
> // - uses log difference instead of percentage
> //
> // - has trigger point indicating when highs and /lows were detected
> //
> // log difference is better because it is symmetrical, log(5/10) and
> log(10/5)
> // has same absolute value, whereas 5/10 and 10/5 have different values.
> //
> // trigger is when you can make a trade. usually a rookie mistake,
> trades are
> // shown to be made at the peaks and troughs of a move, especially in
> // backtesting.
> //
> //----------------------------------------------------------
>
> // 'thold' is the threshold for the zig-zag turning points
> // it is set to a minimum of 2.5% (approx, uses log difference
> // which is more accurate) or a volatility measure
> // based on 2 day range over the past 100 days
>
> min_thold=0.025;
> thold=Max(min_thold,Median(ln(HHV(H,2)/LLV(L,2)),100));
> thold=IIf(IsEmpty(thold),min_thold,thold);
>
> // 't' is a multiplier of 'thold'
> // the larger the value of 't', the more significant the
> // turning point. Adjust it by opening the Parameter window
> // (press ctrl-R)
>
> t=Param("significance",2,2,6,1);
>
> // initialization of variables
>
> d=init=trig=HH=LL=z=0;
>
> // main body
> // this program is different than the canned zigzag in that
> // it is symmetrical, it does not use percentages, but rather
> // log differences. close price is not used either. high and
> // low trades are used. an additional item is the trigger
> // indicator. it shows the point where the zig or zag was
> // identified.
>
> for(i=1;i<BarCount;i++){
> if (log(H[i]/L[init])>HH) HH=log(H[i]/L[init]);
> if (log(L[i]/H[init])<LL) LL=log(L[i]/H[init]);
> if (HH>(t*thold[init]) && d<=0)
> { z[init]--; trig[i]=-0.5; d=1;init=i;HH=0;LL=0; }
>
> if (H[i]>H[init] && d==1){init=i;LL=0;}
>
> if (LL<(-t*thold[init]) && d>=0)
> { z[init]++; trig[i]=0.5; d=-1;init=i;HH=0;LL=0; }
>
> if (L[i]<L[init] && d==-1){init=i;HH=0;}
> }
>
> z_up=z>0; z_dn=z<0;
>
> Plot(z_up,"zig",colorGreen,1);
> Plot(-z_dn,"zag",colorRed,1);
> Plot(trig,"trigger",colorBlue,1);
> _SECTION_END();
>
>
------------------------------------
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