What is a moving average? Check its window and availability

A simple moving average, or SMA, adds the most recent specified number of prices and divides by that number. The window moves as a new observation enters and an old one leaves.

It smooths small changes but does not represent only the latest price movement. Reproducing it requires the price field, observation count and missing-value rules.

In this fictional teaching example, closes are 100, 103, 106 and 109 yen. A three-observation SMA is (100+103+106)÷3 = 103 on observation three, and (103+106+109)÷3 = 106 on observation four. These are not real prices or a recommended window.

The first two observations lack three values. This example leaves them missing instead of inserting zero or using a shorter average. A different initialization rule can produce a different series under the same indicator name.

A longer window retains more older observations, reducing the effect of a single new price. A shorter window gives each new observation more influence. The definition does not establish which window is appropriate.

An SMA differs from averages with other weighting schemes. Check the provider, version, initialization and warm-up requirements rather than identifying an indicator by its appearance.

An average calculated from the close cannot have its final value before that close is known. Record the date when a crossover was observed separately from the date when an order uses that information.

Assuming a trade at the same close requires examining order submission and execution conditions separately. A daily chart is neither an exchange order record nor proof of a fill.

KabuForge’s public course distinguishes the MA strategy path from technical-indicator calculation. Missing indicator values remain blank and plotted lines break at gaps. Computing an indicator does not automatically create orders. Related explanations: look-ahead bias, daily-bar limitations, point-in-time data.

The course compares Native and TA-Lib MA strategy results on the same frozen input. That comparison does not establish equality for every indicator, provider or input. Check versions and conditions in the run records.

Workflow and display claims refer to KabuForge’s public GUI research course, reviewed October 6, 2026. The fictional examples illustrate calculations and are not results from the public course.

The public examples are research-only, and historical information availability is unverified. Explaining a general concept does not establish that every part is implemented by the software. This article recommends no securities, trades or settings. Read the disclaimer.

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