[amibroker] Re: Adjust Volumn Histogram for Spikes ?

["Rick" <rrogers@xxxxxxxxxxxxx>]

Dean:
here is a formula that i use, hope it helps
Rick :

VolFactor =  2.5  ; // use this to adjust the amount to truncate
Per1 = 50 ; 

MaxVol = VolFactor*MA(Volume,Per1);

col1 = IIf( Close >= Ref( Close, -1 ), colorBlack,colorRed);

col2 = IIf(Volume > MaxVol,colorBlue, colorLightGrey);

VolTrunc = IIf(Volume > MaxVol,MaxVol,Volume);

Plot (VolTrunc, "VolTrunc", col1, styleHistogram );

Plot( VolTrunc, "VolDot", col2, 
styleDots|styleNoLine|styleNoLabel|styleNoTitle); /* this plots blue 
dot above truncated volume, grey above others*/

Plot(int(MA(Volume,Per1)),"MA",colorBlue,styleLine);
Plot( 0, "", colorBlack, styleNoLine|styleNoLabel);   /* causes graph 
to scale to 0*/
GraphXSpace = 2;

--- In amibroker@xxxxxxxxxxxxxxx, "troll" <deanhodgins@xxx> wrote:
>
> Intraday charts often show volumn spike at day's
> end or 1.00pm as day /programmed positions closed. 
> This can result in "distorted" volumn histogram that 
> requires high upper value with resulting loss of 
> detail for previous part of day.
> 
> I'm trying to think of way to "dampen" effect of vol spike or
> adjust scale somehow but not sure how to approach. 
> 
> Couldn't find any previous references on board.
> 
> As always gratefull any suggestions or pointers.
> 
> 
> 
> 
> Dean H.
>