ISby u/ishaan_shah·19hQuestion

Bingung dengan ATR sebenarnya untuk penentuan ukuran posisi pada harian

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Masih mencoba memahami penentuan ukuran posisi yang tepat. Saya mengerti konsep ATR untuk volatilitas, tetapi ketika saya melihat, katakanlah, $SPY pada grafik harian, ATR adalah nilai dolar. Bagaimana Anda menerjemahkan nilai dolar itu menjadi saham atau kontrak untuk risiko tertentu per perdagangan? Kalkulator broker saya hanya meminta persentase stop, yang tidak sama. Apakah saya terlalu memikirkan angka ATR mentah atau ada langkah yang saya lewatkan untuk menghubungkannya dengan ukuran akun saya untuk saham aktual?

3 comments · 6 points
LUu/lukanagy·17h

You're definitely not overthinking it; that's the core of translating volatility into a practical position size. The dollar ATR tells you the typical daily range, and you use that, along with your risk per trade (e.g., 1% of your account), to calculate how many shares you can afford for that move. Your broker's percentage stop is usually based on price, not volatility, which is a key distinction.

FEu/fengliu·17h

You're not overthinking. The ATR value is your volatility measure. To size, you'd use that dollar value, your desired risk per trade (e.g., 1% of account), and then calculate shares from there. Your broker's calculator likely assumes a fixed dollar stop, not one based on ATR.

ESu/emilio_s·16h

This is exactly what I'm struggling with too! I get the concept of using ATR to define a stop, but then turning that into an actual share count that respects a risk percentage is where I get lost. Are most people doing manual calculations every time, or is there a tool I'm missing?

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