V-Lab
Chevron Corp GAS-GARCH Student T Volatility Analysis
Volatility prediction for Tuesday, September 15th, 2026
1 Day
21.58%
decreased by 0.36%
1 Week
21.67%
decreased by 0.27%
1 Month
22.00%
increased by 0.06%
Analysis last updated: Monday, September 14, 2026 at 09:46 PM UTC
News Impact Curve
How returns affect tomorrow's volatilityVolatility Forecast
How volatility evolves over timeParameter Estimates
Jan 2, 1990 to Sep 11, 2026Model Insight
Volatility shocks decay with a half-life of 50 trading days, meaning a shock loses half its impact after approximately 50 days. Returns follow a Student-t distribution with v = 8.11 degrees of freedom, capturing fatter tails than a normal distribution.
𝑓
GAS-GARCH-T Model
Tap to view equation
Shock decay: Shocks decay with a 50-day half-lifev = 8.11 · fat tails
| Param | Value | t-stat |
|---|---|---|
| ωconst | 2.4290 | 2.55** |
| αARCH | 0.0634 | 9.79*** |
| βGARCH | 0.9864 | 154.82*** |
| νDF | 8.1131 | 1.32 |
0.986
Persistence50d
Half-life𝑓
GAS-GARCH-T Model
Tap to view equation
| Parameter | Value | t-statistic |
|---|---|---|
ω const Unconditional variance weight | 2.4290 | 2.55** |
α ARCH Response to squared shocks | 0.0634 | 9.79*** |
β GARCH Volatility persistence | 0.9864 | 154.82*** |
ν DF Student-t tail thickness | 8.1131 | 1.32 |
Persistence:
0.986
Half-life:
50 days
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