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Most traders lump ATR and ADX into the same category — volatility tools, momentum tools, trend tools — but they serve completely different purposes.
Understanding that distinction is non-negotiable if you want to interpret market conditions correctly.
Here’s the difference: ATR tells you how much something moves. ADX tells you how strongly it’s moving in a particular direction.
One measures volatility. The other measures trend strength — without any directional bias.
ATR Measures Volatility, Not Trend
ATR, or Average True Range, is what you reach for when you want to know how far a stock or index typically moves over a given period. It’s a nondirectional filter.
If Microsoft (MSFT) has a 10-day ATR of $6.36, that means it’s averaging $6.36 of range per day — regardless of whether it’s trending up or down.
This is crucial when setting stop-losses or profit targets. A fixed-dollar stop might be too tight on a volatile stock, and too loose on a calm one. ATR lets you calibrate your trade parameters based on actual market movement, not gut instinct or arbitrary numbers.
ADX Measures Trend Strength, Not Direction
ADX, or Average Directional Index, doesn’t care which way price is moving — only whether it’s moving with strength. If a stock is making a steep move, whether it’s up or down, the ADX will rise. That’s why a plunging market can still show a strong trend.
An ADX reading above 30 usually signals a clean, directional trend. Below 20, it’s more likely the market is chopping sideways. It’s not uncommon to see ATR and ADX diverge — high volatility without trend, or strong trend with compressed range. That’s why separating the two is essential.
Knowing when to trust trend continuation — and when to expect whipsaws — starts with understanding these tools the right way. Confusing them will cost you.
Roger Scott
Roger Scott Trading
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