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Technical Studies Reference

Narrow Range Bar

This study highlights chart bars that are narrower than any of the prior bars in a specified lookback period.

Let the High and Low Prices at Index \(t\) be denoted as \(H_t\) and \(L_t\), respectively. Then we denote the Range of Current Bar at Index \(t\) as \(RCB_t\). \(RCB_t\) is calculated for \(t \geq 0\) as follows.

\(RCB_t = H_t - L_t\)

Let the Input Number of Bars to Compare be denoted as \(n\). This Input plays the role of a Length. Then we compute a value called Narrow Range for each chart bar, and we denote its value for the given Input \(n\) at Index \(t\) as \(NR_t(n)\). We compute \(NR_t(n)\) for \(t \geq 0\) as follows.

For \(t = 0\): \(NR_0(n) = 1\)

For \(t \leq n - 1\): \(NR_t(n) = \left\{\begin{matrix} 1 & RCB_t < \min\{RCB_0,...,RCB_{t - 1}\} \\ 0 & RCB_t \geq \min\{RCB_0,...,RCB_{t - 1}\} \end{matrix}\right .\)

For \(t > n - 1\): \(NR_t(n) = \left\{\begin{matrix} 1 & RCB_t < \min\{RCB_{t - n},...,RCB_{t - 1}\} \\ 0 & RCB_t \geq \min\{RCB_{t - n},...,RCB_{t - 1}\} \end{matrix}\right .\)

The bar with Index \(t\) is highlighted if and only if \(NR_t(n) = 1\).



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*Last modified Friday, 05th January, 2018.