Sine-weighted MA

Sine-weighted MA draws the half-sine-windowed smoother as a single slope-colored line with an optional faster companion — the definitive clean take on the sine-weighted moving average. Weights peak mid-window and fade toward zero at both ends, so bar-to-bar jitter is heavily damped and the slope flips rarely; the cost is delay of about half the window, which the dashboard quotes exactly as (N − 1) / 2 bars.

How to Trade the Sine-weighted MA?

• Slope color: the line paints bullish while rising and bearish while falling — the low-jitter trend read this weighting exists for.
• Price side of the line: the gradient fill leans bullish while the source holds above the SWMA and bearish below it, the second classic baseline read.
• Fast SWMA crossings: with the pair enabled, the 10-bar line crossing the 20-bar baseline gives steadier crossover legs than equal-weighted averages of the same lengths.

It earns its keep among the trend-following toolkit's slower lines wherever dodging whipsaw is worth more than an early entry — as a pair's slow leg, a slope filter, or a pre-smoothing stage feeding other studies.

Sine-weighted MA Settings

• Source (default close): the series the average smooths.
• Length (default 20): window size N; each bar is weighted by sin(π(i+1)/(N+1)), so raising it buys smoothness at the price of roughly half a window of extra delay.
• Fast SWMA (default off) and Fast SWMA Length (default 10): the crossover companion; keep it shorter than the main length.
• Show Dashboard (default on): length, lag, slope and price position at a glance.
• Style — Slope Trend Coloring (default on), Price / SWMA Gradient Fill (default on), Price Crossing Markers (default off), Line Width (default 2) — control presentation only.

Frequently Asked Questions

What sets it apart from a standard moving average?

An equal-weighted moving average ends its window abruptly, and that sharp cutoff lets stray wiggle through into the plotted line. The half-sine taper suppresses that leakage, so at the same length the SWMA draws calmer output in the same general lag class.

How much lag should I expect?

About (N − 1) / 2 bars — 9.5 at the default 20 — because emphasis sits mid-window. The dashboard reports the figure for both lines. If catching turns early is the goal, this weighting is deliberately the wrong pick.

What alerts are available?

Six: price crossing above or below the SWMA, the slope turning up or down, and — with the pair enabled — the fast SWMA crossing the slow one in either direction.