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V-Lab

S&P 500 Growth Index MF2-GARCH Volatility Analysis

Volatility prediction for Tuesday, September 22nd, 2026

1 Day

13.68%

decreased by 0.30%

1 Week

14.51%

increased by 0.53%

1 Month

16.72%

increased by 2.74%

Analysis last updated: Monday, September 21, 2026 at 11:01 PM UTC

Date Range:

from

to

6M ·

1Y ·

2Y ·

5Y ·

10Y ·

All

graph of S&P 500 Growth Index MF2-GARCH

News Impact Curve

How returns affect tomorrow's volatility

Volatility Forecast

How volatility evolves over time

Parameter Estimates

Oct 29, 1992 to Sep 18, 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

Tap to view equation

Leverage: volatility responds almost entirely to negative shocks
ParamValuet-stat
mwindow61
αARCH0.0000
0.00
βGARCH0.8402
66.70***
γleverage0.2035
12.59***
λ₁tau intercept0.0123
1.44
λ₂forecast adj.0.0772
1.74*
λ₃tau persistence0.9135
18.45***

0.942

Persistence

12d

Half-life
σ

MF2-GARCH Model

Tap to view equation

ParameterValuet-statistic
m

window

Rolling window length

61
α

ARCH

Response to squared shocks

0.0000
0.00
β

GARCH

Volatility persistence

0.8402
66.70***
γ

leverage

Additional response to negative shocks

0.2035
12.59***
λ₁

tau intercept

Baseline long-term coefficient

0.0123
1.44
λ₂

forecast adj.

Forecast performance sensitivity

0.0772
1.74*
λ₃

tau persistence

Long-term factor persistence

0.9135
18.45***

Persistence:

0.942

Half-life:

12 days