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V-Lab

Bayer AG APARCH Volatility Analysis

Volatility prediction for Friday, September 11th, 2026

1 Day

24.38%

increased by 0.82%

1 Week

24.68%

increased by 1.12%

1 Month

25.80%

increased by 2.24%

Analysis last updated: Friday, September 11, 2026 at 07:15 PM UTC

Date Range:

from

to

6M ·

1Y ·

2Y ·

5Y ·

10Y ·

All

graph of Bayer AG APARCH

News Impact Curve

How returns affect tomorrow's volatility

Volatility Forecast

How volatility evolves over time

Parameter Estimates

Jan 2, 1990 to Sep 4, 2026

Model 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.

σ

APARCH Model

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Leverage: Negative returns increase volatility 235% more than positive returnsδ = 0.78 · sub-quadratic power
ParamValuet-stat
ωconst0.0232
4.98***
αARCH0.0498
8.36***
βGARCH0.9502
149.40***
γleverage0.6480
4.81***
δpower0.7831
6.51***

0.988

Persistence

59d

Half-life
σ

APARCH Model

Tap to view equation

ParameterValuet-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