V-Lab
CBOE Silver ETF Volatility Index GAS-GARCH Student T Volatility Analysis
Inactive
Last recorded values (Monday, February 14th, 2022):
1 Day
76.15%
1 Week
76.55%
1 Month
77.83%
Analysis last updated: Wednesday, September 2, 2026 at 03:49 PM UTC
News Impact Curve
How returns affect tomorrow's volatilityVolatility Forecast
How volatility evolves over timeParameter Estimates
Mar 16, 2011 to Feb 11, 2022Model Insight
Volatility shocks decay with a half-life of 24 trading days, meaning a shock loses half its impact after approximately 24 days. Returns follow a Student-t distribution with v = 3.67 degrees of freedom, capturing fatter tails than a normal distribution.
𝑓
GAS-GARCH-T Model
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Shock decay: Shocks decay with a 24-day half-lifev = 3.67 · fat tails
| Param | Value | t-stat |
|---|---|---|
| ωconst | 27.2784 | 0.90 |
| αARCH | 0.0649 | 4.01*** |
| βGARCH | 0.9714 | 25.96*** |
| νDF | 3.6705 | 1.63 |
0.971
Persistence24d
Half-life𝑓
GAS-GARCH-T Model
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| Parameter | Value | t-statistic |
|---|---|---|
ω const Unconditional variance weight | 27.2784 | 0.90 |
α ARCH Response to squared shocks | 0.0649 | 4.01*** |
β GARCH Volatility persistence | 0.9714 | 25.96*** |
ν DF Student-t tail thickness | 3.6705 | 1.63 |
Persistence:
0.971
Half-life:
24 days
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