Aroon.AroonDownOverPeriod Method

Calculates the Aroon Down indicator which measures the relative time since the last lowest low for all periods for which sufficient data is provided.

public double[] AroonDownOverPeriod(
double[] lows,
int periods
);

Parameters

lows: An array where the first term is the traded high of the asset within the most recent trading period, the second term is the traded high of the asset within the previous period and so on.
periods: An integer which represents the length of the period over which the indicator will be iteratively evaluated.

Return Value

Returns of double array where the first term is the value of the Aroon Down indicator over the earliest set of consecutive periods on length period, and the second term is the value of the indicator over the next set of the consecutive periods (i.e. the windows is moved one place along), and so on.

Remarks

The indicator for each period will return a value between 0 and 100, where a higher value indicates that the lowest low was achieved more recently. Persistent values between 70 and 100 are said to indicate weakness in the asset and in conjunction with a low range (i.e. 0-30) in the Aroon Up indicator, indicates an downward trend.

Evaluation

The Aroon Down indicator for each period is given by:

Aroon Down Indicator = 100 * (n - (number of periods since last highest high over n periods) ) / n,

where n is the number of periods being considered (a reasonable default value for n is 14).

Exceptions