Bloomberg Japanese Aggregate Bond Index Total Return Value Unhedged JPY Zero Slope Spline-GARCH Volatility Analysis
Volatility prediction for Friday, July 17th, 2026
1 Day
4.64%
decreased by 0.12%
1 Week
4.62%
decreased by 0.14%
1 Month
4.55%
decreased by 0.21%
Analysis last updated: Friday, July 17, 2026 at 11:35 PM UTC
News Impact Curve
How returns affect tomorrow's volatilityVolatility Forecast
How volatility evolves over timeParameter Estimates
Jun 30, 2000 to Apr 4, 2025Model Insight
With persistence 0.993, volatility shocks have a half-life of 94 trading days (~0.4 years), close to a unit root, so long-run forecasts are highly sensitive to this estimate.
τ
Zero Slope Spline-GARCH Model
Tap to view equation
| Parameter | Value | t-statistic |
|---|---|---|
ω const Unconditional variance weight | 1.4265 | 2.56** |
α ARCH Response to squared shocks | 0.1055 | 8.39*** |
β GARCH Volatility persistence | 0.8871 | 69.85*** |
Spline Coefficients
K=1
| γ1 | 0.0001 | 0.19 |
Persistence:
0.993
Half-life:
94 days
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