RSI Overbought/Oversold Shows Strength, Not Guaranteed Reversals

TL;DR

• RSI compares average gains and average losses over a period and standardizes the result from 0 to 100. Overbought and oversold indicate trend strength, not guaranteed reversal signals.
• Interpret RSI together with trend direction, volume, and other indicators, because fixed thresholds can be misleading.

What is RSI

RSI (Relative Strength Index) is a momentum indicator used in technical analysis. The basic idea is to compare average gains and average losses over a given period (commonly 14 periods) and standardize the relative strength on a scale from 0 to 100. Higher values mean recent gains have been stronger, lower values mean recent losses have been stronger.

Why it matters

RSI measures the strength of price changes rather than price itself, so it helps assess trend persistence or short-term overheating. However, conventional thresholds for overbought (commonly above 70) and oversold (commonly below 30) are customary, and can vary with market context or asset characteristics. It is safer to interpret RSI together with trend, volume, and support/resistance rather than relying on a single indicator. Use tools like Chart Technical Analysis to compare with other indicators.

RSI calculation example (hypothetical numbers)

This shows the calculation with a simple 6-period example instead of the usual 14. Assumed closing prices: 10, 12, 11, 13, 14, 12

1) Period changes (today close - yesterday close): -, +2, -1, +2, +1, -2
2) Sum of gains only: 2 + 0 + 2 + 1 + 0 = 5
3) Sum of losses only (absolute): 0 + 1 + 0 + 0 + 2 = 3
4) Average gain = sum of gains / number of periods (here either 5 or 6 depending on interpretation). Traditional RSI uses exponential averaging, but for simple average explanation average gain = 5/5 = 1, average loss = 3/5 = 0.6
5) Relative Strength (RS) = average gain / average loss = 1 / 0.6 ≈ 1.667
6) RSI = 100 - (100 / (1 + RS)) = 100 - (100 / 2.667) ≈ 62.5

In this example RSI is about 62.5, not clearly in overbought or oversold territory. Actual chart values vary with period settings and averaging method (simple or exponential).

Common misunderstandings and how to respond

1) RSI overbought means an immediate drop

• Misunderstanding: Assuming a decline will follow solely because RSI exceeds 70 is incorrect. In a strong uptrend, RSI can remain elevated for an extended period.
• Response: Check trend direction, support/resistance, and volume together.

2) Oversold always means a rebound

• Misunderstanding: A low RSI does not guarantee a quick bounce. Oversold regions can repeat in a downtrend.
• Response: Confirm a rebound with candle patterns or other momentum indicators before treating it as a signal.

3) Apply the same thresholds to every asset

• Misunderstanding: Volatile assets may require adjusted RSI thresholds.
• Response: Adjust period and thresholds by asset characteristics and validate with backtests.

Summary

RSI is a useful indicator that quantifies the strength of price changes. Overbought and oversold readings can be misleading if interpreted alone, so combine RSI with trend, volume, and other indicators. Check indicator settings and calculation methods, as they affect values in practice.

This article is for informational purposes and not investment advice.