V-Lab
ExxonMobil Holdings Corp GAS-GARCH Student T Volatility Analysis
Volatility prediction for Monday, July 27th, 2026
1 Day
25.98%
decreased by 1.20%
1 Week
25.97%
decreased by 1.21%
1 Month
25.93%
decreased by 1.25%
Analysis last updated: Friday, July 24, 2026 at 11:08 PM UTC
News Impact Curve
How returns affect tomorrow's volatilityVolatility Forecast
How volatility evolves over timeParameter Estimates
Jan 2, 1990 to Jul 24, 2026Model Insight
With persistence 0.993, volatility shocks have a half-life of 93 trading days (~0.4 years), close to a unit root, so long-run forecasts are highly sensitive to this estimate. Returns follow a Student-t distribution with v = 8.59 degrees of freedom, capturing fatter tails than a normal distribution.
𝑓
GAS-GARCH-T Model
Tap to view equation
| Parameter | Value | t-statistic |
|---|---|---|
ω const Unconditional variance weight | 2.5481 | 6.97*** |
α ARCH Response to squared shocks | 0.0634 | 39.53*** |
β GARCH Volatility persistence | 0.9925 | 866.85*** |
ν DF Student-t tail thickness | 8.5896 | 5.61*** |
Persistence:
0.993
Half-life:
93 days
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