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Technical analysis

Oscillator

By Jarosław Wasiński • Published: • Updated:
An indicator that fluctuates around a reference level or within a range to describe features such as momentum. Some oscillators are bounded, such as RSI, while others, such as MACD, are not. An overbought or oversold reading describes the calculation and is not a guarantee that price will reverse.
Example. RSI = 80 and CCI = 180 are readings on different scales. RSI is bounded between zero and 100; CCI has no corresponding fixed limit. A larger number does not mean CCI identifies more than twice as much overbought pressure.

Scale and reference

RSI and stochastic have fixed ranges; Williams %R runs from −100 to zero. MACD and CCI are not bounded by a fixed band. Zero, the scale midpoint and interpretive thresholds are distinct reference points. Read them alongside the formula, period and data source rather than compare raw numbers across indicators.

Extreme readings

Overbought commonly names a scale region, not an obligation for price to decline. A rising trend can sustain high readings and a falling trend low ones. Threshold re-entry, crossovers and divergence form separate rule variants with different information timing and event counts. A regime filter also needs evaluation rather than being assumed to solve the problem.

Avoid adding apparent confirmations

Several oscillators can express related information from the same history. More agreeing readings do not automatically multiply success probability. Before adding a tool, state its distinct role and compare the complete variant against a simpler baseline. Preserve costs and validation outside parameter selection; attractive agreement on a finished chart is insufficient.

FAQ

Does every oscillator have a zero-to-100 range?
No. Bounds and scales depend on the formula.
Do three oscillators eliminate false signals?
No. They can repeat information and still form incorrect or losing rules.

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Jarosław Wasiński

Editor-in-chief, ForexMechanics.com • Macro & FX analyst

Independent analyst and practitioner with over 20 years of experience in financial markets. Actively involved in Forex since 2007, with a focus on fundamental analysis, OTC market structure, and disciplined capital risk management.

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