Overview

Harmonic market rotations, measured.

This study calculates and displays a histogram of market rotations based on a ZigZag study input. It helps identify ‘normal’ and ‘impulsive’ rotations from statistical calculations, letting you spot moves with a higher probability of continuation. A practical use is risk management: place stop losses beyond typical rotation sizes to reduce the chance of getting stopped out by market noise.

It supports multiple methods for calculating value areas (Standard Deviation and Frequency-Based), offers Winsorization to handle outliers, and ships a fully integrated alert system with custom thresholds for detecting abnormal rotations across multiple markets. You can base the calculations on the Mode instead of the Mean, and every element is customizable in position, size and color, optimized for smooth OpenGL performance in Sierra Chart.

Calculation methods

Two ways to define “normal”.

01Standard Deviation Method

Key value areas are calculated from the Mean of all rotations. Because markets tend to be right-skewed, with most rotations clustered around the Mode while extreme outliers push the Mean higher, two tools handle the skew:

Winsorization: optionally caps extreme outliers at a threshold (e.g. 90th percentile) so the Mean better represents the bulk of rotations.
Mode-based calculation: base the math on the Mode instead of the Mean to focus on the majority of rotations and ignore extreme outliers.
Value Area Low (VAL68) = Mean (or Mode) − 1 standard deviation.
Value Area High (VAH68) = Mean (or Mode) + 1 standard deviation.
Impulse Area (VAH90) = Mean (or Mode) + 1.666 standard deviations.

02Frequency-Based Method

Works like a volume profile's value area: starting from the most frequent rotations around the Mode, it accumulates them until 68% of all rotations are included, highlighting the most common market behavior while reducing the impact of outliers.

Value Area: the most common rotation bins are prioritized until 68% of total rotations are reached, giving a clear picture of ‘normal’ behavior.
Impulse Area (VAH90): calculated from the 90th percentile, marking rotations considered impulsive.

Additional features

Built for the desk.

Alerts. Built-in notifications when rotations exceed your thresholds. Scan multiple markets for impulse rotations in the background.
Customizable display. Adjust the positioning, sizing and color of histogram bars, borders and text to your liking.
OpenGL compatibility. Fully compatible with OpenGL for a smooth workflow inside Sierra Chart.

Harmonic Rotations study settings panel in Sierra Chart

Every element configurableStudy settings

Good to know

FAQ.

How do I get access after subscribing?

At checkout you provide your Sierra Chart Account Name (Help → About → Account Name / Username). Within 24 hours we add you to the list of users authorized to use the study. Restart Sierra Chart and open the automatically downloaded chartbook.

Is there a free trial?

Yes - both subscription plans (monthly and annual) start with a 7-day free trial: you won't be charged until the trial ends, and you can cancel anytime before then. The lifetime plan is a one-time purchase, so there's no trial.

Can I use the indicator on all symbols?

Yes. The indicator builds on Sierra Chart's built-in ZigZag study: it takes the generated rotation sizes and runs its statistics on top. It works on any chart and any symbol where the ZigZag study is applied and has generated values.