Bollinger Bands

Plain-language meaning

Bollinger Bands place configurable population-standard-deviation bands around a moving average; XMarketRadar's standard setting is 20 periods and 2 deviations.

Why it is useful

Bollinger Bands is useful as descriptive evidence when it is compared on the same definition, source, period, unit and exact listing. It is one input to research, not a verdict.

Where it appears in XMarketRadar

Look for Bollinger Bands in Advanced Chart settings, indicator panels, screeners and technical research for the selected listing and bar interval.

How it is calculated or sourced

For the standard XMarketRadar setting, calculate the 20-close SMA, calculate trailing population standard deviation using divisor N, then set upper = SMA + 2×deviation and lower = SMA − 2×deviation. A complete 20-bar window is required.

Inputs, period and unit

Read the disclosed inputs or source, observation period, bar interval, unit, native currency and scale. A value without its source and as-of context is incomplete; unlike units must not be combined.

Worked example

Illustrative only: With a 20-period SMA of ₹100, population standard deviation ₹4 and multiplier 2, the middle band is ₹100, lower band ₹92 and upper band ₹108. A close of ₹106 is inside the bands and does not by itself predict the next move.

What high and low mean

A higher or lower Bollinger Bands value is descriptive, not automatically good or bad. Meaning depends on the instrument, comparison period, method and related evidence.

Positive, negative and genuine zero

Positive and negative Bollinger Bands values retain the definition shown here. A genuine reported or computed zero is displayed as 0 and is not the same as missing evidence.

When it is unavailable

Unavailable (—) means Bollinger Bands is absent, unsupported, stale under the screen's rules or not computable from verified inputs. It must never be converted to zero or a neutral signal.

Limitations and common mistakes

Settings, warm-up history, adjusted-price basis and smoothing convention materially change results. Do not compare differently configured indicators as if identical. Partial bars and corporate-action discontinuities can create misleading moves.

Market-specific differences

The concept is used across all supported markets, but currency, price scale, session calendar, source field and regulatory definition can differ. XMarketRadar preserves the exact exchange context.

Related terms

Use the related-term links on this page to compare Bollinger Bands with neighbouring definitions while retaining each term's distinct source, unit and limitations.

Suggested next steps

Open the related Technical analysis terms below, then follow the matching Help Centre task guide and inspect Bollinger Bands on an exact exchange listing. Confirm source, as-of time, units and unavailable reason before using it in research.

Educational information only; not investment advice or an order service.

This Bollinger Bands tutorial is educational and descriptive. It is not investment advice, a price prediction, a recommendation, or an instruction to buy, sell, rebalance or place an order.