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V-Lab

PMA Graphene Technology Group Inc MF2-GARCH Volatility Analysis

Volatility prediction for Tuesday, September 15th, 2026

1 Day

125.16%

decreased by 9.35%

1 Week

133.81%

decreased by 0.70%

1 Month

135.87%

increased by 1.36%

Analysis last updated: Monday, September 14, 2026 at 09:34 PM UTC

Date Range:

from

to

6M ·

1Y ·

All

graph of PMA Graphene Technology Group Inc MF2-GARCH

News Impact Curve

How returns affect tomorrow's volatility

Volatility Forecast

How volatility evolves over time

Parameter Estimates

Nov 22, 2024 to Sep 11, 2026

Model Insight

This asset shows a rare inverse leverage effect: positive returns raise next-day volatility 239% more than negative returns. Volatility rises more after gains than after losses, the reverse of the usual leverage effect and uncommon among risky assets.

σ

MF2-GARCH Model

Tap to view equation

Inverse leverage: Positive returns increase volatility 239% more than negative returns
ParamValuet-stat
mwindow126
αARCH0.2852
4.59***
βGARCH0.0000
0.00
γleverage-0.2011
-3.03***
λ₁tau intercept10.0000
0.48
λ₂forecast adj.0.0000
0.00
λ₃tau persistence0.8647
3.25***

0.185

Persistence

0d

Half-life
σ

MF2-GARCH Model

Tap to view equation

ParameterValuet-statistic
m

window

Rolling window length

126
α

ARCH

Response to squared shocks

0.2852
4.59***
β

GARCH

Volatility persistence

0.0000
0.00
γ

leverage

Additional response to negative shocks

-0.2011
-3.03***
λ₁

tau intercept

Baseline long-term coefficient

10.0000
0.48
λ₂

forecast adj.

Forecast performance sensitivity

0.0000
0.00
λ₃

tau persistence

Long-term factor persistence

0.8647
3.25***

Persistence:

0.185

Half-life:

0 days