RSI thực sự đo gì
RSI compares the average size of recent up-moves against recent down-moves and compresses the result into a 0–100 scale. Above 70 is conventionally “overbought”, below 30 “oversold”. What it really measures is momentum — how one-sided the last N bars have been.
Huyền thoại 70/30
In a strong uptrend, RSI can sit above 70 for weeks while price doubles. Selling the first overbought reading is how traders short the strongest markets on the chart. Overbought means the move is fast — it does not mean the move is over.
Phân kỳ — tín hiệu giá trị nhất
When price makes a new high but RSI makes a lower high, the move is running on fewer participants — bearish divergence. New price low with a higher RSI low is bullish divergence. Divergences don't time the turn precisely, but they flag exhaustion earlier than any crossover.
- Confirm divergence with structure: wait for the trendline or last swing to actually break.
- Higher timeframes produce more reliable divergences than 1-minute noise.
- Combine with the 50-EMA trend filter to avoid counter-trend knife-catching.
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