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Vanguard S&P 500 ETF MF2-GARCH Volatility Analysis

Volatility prediction for Tuesday, September 29th, 2026

1 Day

12.20%

increased by 1.41%

1 Week

12.53%

increased by 1.74%

1 Month

13.39%

increased by 2.60%

Analysis last updated: Monday, September 28, 2026 at 09:57 PM UTC

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graph of Vanguard S&P 500 ETF MF2-GARCH

News Impact Curve

How returns affect tomorrow's volatility

Volatility Forecast

How volatility evolves over time

Parameter Estimates

Sep 9, 2010 to Sep 25, 2026

Model Insight

This asset exhibits a strong leverage effect: volatility responds almost entirely to negative shocks. The ARCH response to positive shocks is negligible.

σ

MF2-GARCH Model

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Leverage: volatility responds almost entirely to negative shocks
ParamValuet-stat
mwindow81
αARCH0.0000
0.00
βGARCH0.8014
35.23***
γleverage0.2682
9.92***
λ₁tau intercept0.1054
1.62
λ₂forecast adj.0.4009
2.42**
λ₃tau persistence0.4914
2.31**

0.935

Persistence

10d

Half-life
σ

MF2-GARCH Model

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ParameterValuet-statistic
m

window

Rolling window length

81
α

ARCH

Response to squared shocks

0.0000
0.00
β

GARCH

Volatility persistence

0.8014
35.23***
γ

leverage

Additional response to negative shocks

0.2682
9.92***
λ₁

tau intercept

Baseline long-term coefficient

0.1054
1.62
λ₂

forecast adj.

Forecast performance sensitivity

0.4009
2.42**
λ₃

tau persistence

Long-term factor persistence

0.4914
2.31**

Persistence:

0.935

Half-life:

10 days