Secuencia de Fibonacci: significado, ejemplo y riesgos
The Fibonacci sequence is a series in which each number is the sum of the two preceding numbers. In technical analysis, ratios associated with the sequence are used to plot Fibonacci retracement levels on price charts. Analysts monitor these levels as possible areas of support or resistance after a substantial price move. They are charting guides, not guaranteed forecasts or standalone buy and sell signals.
The Fibonacci sequence begins 0, 1, 1, 2, 3, 5, 8, 13, 21 and continues by adding the two preceding terms. Technical analysts use ratios associated with this sequence to divide the distance between a significant price high and low. The resulting horizontal lines are called Fibonacci retracement levels. They indicate prices at which a market might pause, encounter support or meet resistance while retracing part of an earlier move. This application is a trading convention based on historical price data, not a law governing future market behavior.
What Fibonacci sequence means
Important ratios include approximately 61.8%, 38.2% and 23.6%. For example, dividing 21 by 34 gives about 61.8%; dividing 13 by 34 gives about 38.2%; and dividing 8 by 34 gives about 23.6%. Charting tools commonly display these levels together with 50% and 78.6%. The 50% level is a widely followed convention, not a ratio derived from the Fibonacci sequence. The 78.6% level is calculated as the square root of 61.8%. In this context, a retracement is a price movement that reverses part of a previous rise or decline. The plotted percentages identify possible—not certain—turning or consolidation areas.
Cómo funciona
An analyst first selects a meaningful swing high and swing low on a stock, index or other price chart. The charting tool measures the vertical distance between those endpoints and plots horizontal lines at levels such as 23.6%, 38.2%, 50%, 61.8% and 78.6%, with 0% and 100% marking the extremes. After an upward move, the levels below the high may be watched as possible support during a pullback. After a downward move, levels above the low may be watched as possible resistance during a rebound. Selecting the endpoints requires judgment, so two analysts can produce different levels from the same chart. Fibonacci retracements cannot directly generate dependable buy or sell signals. Analysts commonly use them as guides alongside other chart evidence, including trendlines, moving averages or oscillators.
Ejemplo práctico
Suppose a hypothetical stock rises from $100 to $200, a total move of $100. Measured downward from the $200 high, a 23.6% retracement is $176.40: $200 − ($100 × 0.236). The 38.2% level is $161.80, the 50% level is $150, the 61.8% level is $138.20 and the 78.6% level is $121.40. If the price later declines, an analyst may monitor these prices as possible support areas. The price could pause near one, reverse before reaching one or pass through every level. This example demonstrates only the calculation; it does not predict performance or recommend a trade.
Riesgos y limitaciones
Fibonacci retracement analysis has several limitations. First, choosing the relevant high and low is subjective. Different endpoints produce different levels and interpretations. Second, prices do not have to stop or reverse at a retracement line, so the method can produce false or ambiguous signals. Third, the calculation uses past price movement and does not incorporate company fundamentals, market news, liquidity or changes in volatility. A sudden event may therefore make the plotted levels less useful. Finally, widely watched levels may appear significant because many market participants monitor them, but that does not establish a dependable causal or predictive relationship. Relying on Fibonacci retracements alone can lead to poorly supported decisions; the levels should be understood as heuristic charting guides rather than promises of future results.
Preguntas frecuentes
What is the Fibonacci sequence in simple terms?
It is a number series in which each term equals the sum of the two preceding terms, such as 0, 1, 1, 2, 3, 5, 8 and 13. Technical analysts use ratios associated with the series to create retracement levels.
How are Fibonacci retracement levels drawn?
Select a significant high and low, measure the vertical price distance between them and plot horizontal lines at commonly used percentages such as 23.6%, 38.2%, 50%, 61.8% and 78.6%.
Do Fibonacci retracement levels predict reversals?
No. They mark possible support or resistance areas, but prices can cross them without pausing or reversing. They are not standalone buy or sell signals.
Is 50% a Fibonacci ratio?
No. It is a conventional retracement level commonly displayed with Fibonacci-derived levels.
Why might analysts draw different levels?
The choice of swing high and swing low is subjective. Selecting different price moves or endpoints changes the resulting retracement prices.
Nota educativa: Este material explica un concepto de mercado; no es asesoramiento de inversión personalizado.
Fuentes
- Fibonacci Retracements and Projections
- How Fibonacci Retracements Can Identify Support And Resistance | Nasdaq
- Fibonacci Numbers - Learn How To Use Fibonacci in Investing
- Fibonacci Retracements - Overview, How To Conduct, Analysis
- Strategies for Trading Fibonacci Retracement Levels
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