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Moving Average Complete Guide: The Foundation of Trend Analysis

Technical Analysis Basics · 8 min read

What is a Moving Average?

A Moving Average (MA) smooths price data by averaging closing prices over a specified period, revealing the underlying trend direction. MAs are the foundation of most technical indicators and serve as important cost reference points for institutional investors.

Common MA Periods

💡 線上有位 uses MA20 vs MA60 for trend determination: MA20 above MA60 = bullish trend.

Four Functions of Moving Averages

1. Trend Direction

Short MA above long MA (bullish alignment) = uptrend. Short MA below long MA = downtrend.

2. Dynamic Support & Resistance

In uptrends, pullbacks to MA20 or MA60 often find support. In downtrends, bounces to these MAs often meet resistance.

3. Golden & Death Crosses

Short MA crossing above long MA = golden cross (buy). Crossing below = death cross (sell). Common pairs: MA5×MA20, MA20×MA60.

4. Bias Ratio

Bias = (Price − MA) ÷ MA × 100%. Large positive bias = overextended rally; large negative bias = oversold, may revert to mean.

FAQ

What's the difference between SMA and EMA?

SMA weights all periods equally; EMA gives more weight to recent prices and responds faster. Most stock charts use SMA; MACD uses EMA internally.

Must I buy every golden cross?

No. Combine with volume expansion and fundamentals. Golden crosses generate false signals in sideways markets.

Should I sell when price breaks below MA?

Depends on which MA. Breaking MA5 is just short-term weakness. Breaking MA60 with no quick recovery is a medium-term bearish signal worth taking seriously.

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