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Garman-Klass volatility estimator for Amibroker (AFL)
JaNa
almost 9 years ago
Amibroker (AFL)

Rating:
5 / 5 (Votes 1)
Tags:
amibroker, exploration

http://formulapages.com/eq/402

Exploration outputs Garman-Klass volatility

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Indicator / Formula

Copy & Paste Friendly
period = Param("lookback period",30,5,300,1);

TimeFrameSet(inDaily);
GKvol = sqrt(252/period*(0.5 * (ln(H/L))^2 - (2*ln(2)-1) * (ln(O/C))^2 ));
TimeFrameRestore();

Filter=1;
AddColumn(GKvol,"GKvol", 1.0, colorDefault, colorDefault,45);

1 comments

1. JaNa

Seems sum function is missing

Change GKvol with this one:
GKvol = sqrt(252/period * Sum((0.5 * (ln(H/L))^2 – (2*ln(2)-1) * (ln(O/C))^2 ), period));

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