[amibroker] Re: Blau's Tick Volume Index

["JD Fagan" <jd.fagan@xxxxxxxxx>]

--- In amibroker@xxxxxxxxxxxxxxx, "l_abarr" <l_abarr@xxx> wrote:
>
> Hi,
> 
> Does anyone know how to code William Blau's Tick Volume Indicator?
> Blau defines TVI in this manner:
> 
> TVI (r,s) = [Double EMA(upticks,r,s)-Double EMA(downticks,r,s)]/
> [Double EMA(upticks,r,s)+Double EMA(downticks,r,s)]
> 
> I really appreciate help from anyone. I'm obviously poor at coding...
>
Wasn't sure what the r and s meant, but here's a shot with assumption
that uptick is when rate of change since last bar is 0% or up and
downtick is less than 0%:

function tvi(array, periods) {
    upticks = Cum(ROC(array, 1) >= 0);
    downticks = Cum(ROC(array, 1) < 0);
    return (DEMA(upticks, periods) - DEMA(downticks, periods)) /
(DEMA(upticks, periods) + DEMA(downticks, periods));
}

//Example usage
Plot(tvi(Close, 10), "Blau's TVI for Close", colorBlue, styleLine);
Plot(tvi(Volume, 10), "Blau's TVI for Volume", colorGreen, styleLine);




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