V-Lab
Bayer AG APARCH Volatility Analysis
Volatility prediction for Friday, September 11th, 2026
1 Day
24.38%
1 Week
24.68%
1 Month
25.80%
Analysis last updated: Friday, September 11, 2026 at 07:15 PM UTC
News Impact Curve
How returns affect tomorrow's volatilityVolatility Forecast
How volatility evolves over timeParameter Estimates
Jan 2, 1990 to Sep 4, 2026Model Insight
This asset exhibits a strong leverage effect: negative returns increase next-day volatility 235% more than equivalent positive returns. The volatility power δ = 0.78 sits below 2, so large shocks influence volatility less than quadratically, a more outlier-robust response than standard GARCH.
APARCH Model
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| Param | Value | t-stat |
|---|---|---|
| ωconst | 0.0232 | 4.98*** |
| αARCH | 0.0498 | 8.36*** |
| βGARCH | 0.9502 | 149.40*** |
| γleverage | 0.6480 | 4.81*** |
| δpower | 0.7831 | 6.51*** |
0.988
Persistence59d
Half-lifeAPARCH Model
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| Parameter | Value | t-statistic |
|---|---|---|
ω const Unconditional variance weight | 0.0232 | 4.98*** |
α ARCH Response to squared shocks | 0.0498 | 8.36*** |
β GARCH Volatility persistence | 0.9502 | 149.40*** |
γ leverage Additional response to negative shocks | 0.6480 | 4.81*** |
δ power Transformation power | 0.7831 | 6.51*** |
Persistence:
0.988
Half-life:
59 days
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