V-Lab
Bloomberg Global-Aggregate Total Return Index Value Hedged USD GAS-GARCH Student T Volatility Analysis
Volatility prediction for Friday, August 21st, 2026
1 Day
2.81%
decreased by 0.05%
1 Week
2.81%
decreased by 0.05%
1 Month
2.83%
decreased by 0.03%
Analysis last updated: Friday, August 21, 2026 at 08:21 PM UTC
News Impact Curve
How returns affect tomorrow's volatilityVolatility Forecast
How volatility evolves over timeParameter Estimates
May 31, 2000 to Apr 4, 2025Model Insight
With persistence 0.994, volatility shocks have a half-life of 121 trading days (~0.5 years), close to a unit root, so long-run forecasts are highly sensitive to this estimate. Returns follow a Student-t distribution with v = 8.50 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 | 0.0373 | 8.98*** |
α ARCH Response to squared shocks | 0.0440 | 38.72*** |
β GARCH Volatility persistence | 0.9943 | 1,508.79*** |
ν DF Student-t tail thickness | 8.4957 | 5.58*** |
Persistence:
0.994
Half-life:
121 days
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