V-Lab
Ishares S&P 500 EX S&P 1 ETF GAS-GARCH Student T Volatility Analysis
Volatility prediction for Tuesday, September 29th, 2026
1 Day
12.36%
increased by 0.07%
1 Week
12.43%
increased by 0.14%
1 Month
12.44%
increased by 0.15%
Analysis last updated: Monday, September 28, 2026 at 09:57 PM UTC
News Impact Curve
How returns affect tomorrow's volatilityVolatility Forecast
How volatility evolves over timeParameter Estimates
Jul 9, 2025 to Sep 25, 2026𝑓
GAS-GARCH-T Model
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| Param | Value | t-stat |
|---|---|---|
| ωconst | 0.6147 | 7.20*** |
| αARCH | 0.0398 | 0.15 |
| βGARCH | 0.0000 | 0.00 |
| νDF | 18.7970 | 0.01 |
0.000
Persistence-
Half-life𝑓
GAS-GARCH-T Model
Tap to view equation
| Parameter | Value | t-statistic |
|---|---|---|
ω const Unconditional variance weight | 0.6147 | 7.20*** |
α ARCH Response to squared shocks | 0.0398 | 0.15 |
β GARCH Volatility persistence | 0.0000 | 0.00 |
ν DF Student-t tail thickness | 18.7970 | 0.01 |
Persistence:
0.000
Half-life:
-
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