Xtrackers S&P 100 Ex Top 20 ETF APARCH Volatility Analysis
Volatility prediction for Tuesday, July 21st, 2026
1 Day
13.29%
increased by 0.21%
1 Week
13.20%
increased by 0.12%
1 Month
13.04%
decreased by 0.04%
Analysis last updated: Monday, July 20, 2026 at 09:24 PM UTC
News Impact Curve
How returns affect tomorrow's volatilityVolatility Forecast
How volatility evolves over timeParameter Estimates
Nov 28, 2022 to Jul 17, 2026Model Insight
Volatility shocks decay with a half-life of 4 trading days, meaning a shock loses half its impact after approximately 4 days.
σ
APARCH Model
Tap to view equation
| Parameter | Value | t-statistic |
|---|---|---|
ω const Unconditional variance weight | 0.1087 | 13.99*** |
α ARCH Response to squared shocks | 0.0513 | 0.00 |
β GARCH Volatility persistence | 0.7354 | 26.83*** |
γ leverage Additional response to negative shocks | 1.0000 | 0.00 |
δ power Transformation power | 1.9903 | 7.74*** |
Persistence:
0.837
Half-life:
4 days
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