Overbought indicators: what they actually measure
beginner
Automated material · TradeAlmanac editorial deskDraft prepared by a language model from our stored data; not reviewed by an editor.
Oscillators such as the relative strength index measure how fast and how far a price travelled over recent periods.
What a high reading means
That the rise was fast. Not that the security is expensive, and not that it will reverse.
A strong security in a sustained trend shows high readings for a long time — and keeps rising throughout.
Where oscillators are more useful
In a range, when the price oscillates within bounds. There, reversion to the mean genuinely happens more often.
The irony is that whether a trend or a range is in progress can only be determined in hindsight.
Divergence
A disagreement between the direction of price and the direction of the indicator is treated as a precursor of a reversal. Sometimes a reversal follows; sometimes the divergence persists and resolves with the trend continuing.
How to treat them
As a description of the speed of a move. That is useful: knowing a security rose quickly changes the assessment of the risk of entering right now.
As a signal — with caution proportionate to the fact that the decision to own a business is not made on the speed of its quote.
Related: Moving averages: smoothing rather than a signal and The limits of technical analysis.
Related instruments
Draft prepared by a language model from our stored data; not reviewed by an editor.
Model: claude-opus-5
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