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HSI Volatility Index Zero Slope Spline-GARCH Volatility Analysis

Volatility prediction for Friday, September 4th, 2026

1 Day

78.87%

decreased by 1.04%

1 Week

84.17%

increased by 4.26%

1 Month

95.13%

increased by 15.22%

Analysis last updated: Friday, September 4, 2026 at 11:28 PM UTC

Date Range:

from

to

6M ·

1Y ·

2Y ·

5Y ·

10Y ·

All

graph of HSI Volatility Index S0GARCH

News Impact Curve

How returns affect tomorrow's volatility

Volatility Forecast

How volatility evolves over time

Parameter Estimates

Jul 16, 2010 to Aug 27, 2026

Model Insight

This model fits a time-varying baseline (a spline), so volatility mean-reverts toward a slowly-shifting long-run level rather than a constant. Short-run deviations decay with a half-life of 7 trading days.

τ

Zero Slope Spline-GARCH Model

Tap to view equation

Time-varying baseline: volatility reverts to a slowly-shifting spline trend
ParamValuet-stat
ωconst0.7142
6.86***
αARCH0.0999
5.49***
βGARCH0.8073
23.23***
γi Spline Coefficients
K=8
γ1-0.6295
-3.09***
γ21.0621
3.17***
γ3-0.7501
-2.70***
γ40.5417
2.08**
γ5-0.3623
-1.70*
γ60.0918
0.49
γ70.2405
1.65*
γ8-0.3016
-2.55**

0.907

Persistence

7d

Half-life
τ

Zero Slope Spline-GARCH Model

Tap to view equation

ParameterValuet-statistic
ω

const

Unconditional variance weight

0.7142
6.86***
α

ARCH

Response to squared shocks

0.0999
5.49***
β

GARCH

Volatility persistence

0.8073
23.23***
γi Spline Coefficients
K=8
γ1-0.6295
-3.09***
γ21.0621
3.17***
γ3-0.7501
-2.70***
γ40.5417
2.08**
γ5-0.3623
-1.70*
γ60.0918
0.49
γ70.2405
1.65*
γ8-0.3016
-2.55**

Persistence:

0.907

Half-life:

7 days