V-Lab
Goldman Sachs Equal Weight US Large Cap Equity ETF GAS-GARCH Student T Volatility Analysis
Volatility prediction for Wednesday, September 30th, 2026
1 Day
11.04%
decreased by 0.95%
1 Week
11.44%
decreased by 0.55%
1 Month
12.64%
increased by 0.65%
Analysis last updated: Tuesday, September 29, 2026 at 09:19 PM UTC
News Impact Curve
How returns affect tomorrow's volatilityVolatility Forecast
How volatility evolves over timeParameter Estimates
Sep 15, 2017 to Sep 25, 2026Model Insight
Volatility shocks decay with a half-life of 21 trading days, meaning a shock loses half its impact after approximately 21 days. Returns follow a Student-t distribution with v = 8.44 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 21-day half-lifev = 8.44 · fat tails
| Param | Value | t-stat |
|---|---|---|
| ωconst | 1.0525 | 2.53** |
| αARCH | 0.1324 | 5.75*** |
| βGARCH | 0.9680 | 65.59*** |
| νDF | 8.4396 | 1.09 |
0.968
Persistence21d
Half-life𝑓
GAS-GARCH-T Model
Tap to view equation
| Parameter | Value | t-statistic |
|---|---|---|
ω const Unconditional variance weight | 1.0525 | 2.53** |
α ARCH Response to squared shocks | 0.1324 | 5.75*** |
β GARCH Volatility persistence | 0.9680 | 65.59*** |
ν DF Student-t tail thickness | 8.4396 | 1.09 |
Persistence:
0.968
Half-life:
21 days
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