V-Lab
Blom Stock Index GAS-GARCH Student T Volatility Analysis
Volatility prediction for Friday, September 18th, 2026
1 Day
21.84%
1 Week
22.15%
1 Month
23.33%
Analysis last updated: Friday, September 18, 2026 at 10:08 PM UTC
News Impact Curve
How returns affect tomorrow's volatilityVolatility Forecast
How volatility evolves over timeParameter Estimates
Jan 19, 1996 to Sep 10, 2026Model Insight
With persistence 0.998, volatility shocks have a half-life of 386 trading days (~1.5 years), close to a unit root, so long-run forecasts are highly sensitive to this estimate. Returns follow a Student-t distribution with v = 2.64 degrees of freedom, capturing fatter tails than a normal distribution.
GAS-GARCH-T Model
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| Param | Value | t-stat |
|---|---|---|
| ωconst | 16.9409 | 2.15** |
| αARCH | 0.1530 | 41.04*** |
| βGARCH | 0.9982 | 1,221.79*** |
| νDF | 2.6446 | 79.84*** |
0.998
Persistence386d
Half-lifeGAS-GARCH-T Model
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| Parameter | Value | t-statistic |
|---|---|---|
ω const Unconditional variance weight | 16.9409 | 2.15** |
α ARCH Response to squared shocks | 0.1530 | 41.04*** |
β GARCH Volatility persistence | 0.9982 | 1,221.79*** |
ν DF Student-t tail thickness | 2.6446 | 79.84*** |
Persistence:
0.998
Half-life:
386 days
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