V-Lab
S&P BSE SENSEX Index GJR-GARCH Volatility Analysis
High-persistence model: shocks decay very slowly, so the theoretical long-run value may not be practically meaningful
Volatility prediction for Monday, September 28th, 2026
1 Day
13.42%
1 Week
13.68%
1 Month
14.67%
Analysis last updated: Friday, September 25, 2026 at 12:02 PM UTC
News Impact Curve
How returns affect tomorrow's volatilityVolatility Forecast
How volatility evolves over timeParameter Estimates
Jan 1, 1990 to Sep 25, 2026Model Insight
With persistence 1.000, volatility shocks have a half-life of 60273 trading days (~239.2 years), close to a unit root, so long-run forecasts are highly sensitive to this estimate.
GJR-GARCH Model
Tap to view equation
| Param | Value | t-stat |
|---|---|---|
| ωconst | 0.0139 | 4.20*** |
| αARCH | 0.0653 | 4.80*** |
| βGARCH | 0.9106 | 110.00*** |
| γleverage | 0.0482 | 1.96* |
1.000
Persistence60273d
Half-lifeGJR-GARCH Model
Tap to view equation
| Parameter | Value | t-statistic |
|---|---|---|
ω const Unconditional variance weight | 0.0139 | 4.20*** |
α ARCH Response to squared shocks | 0.0653 | 4.80*** |
β GARCH Volatility persistence | 0.9106 | 110.00*** |
γ leverage Additional response to negative shocks | 0.0482 | 1.96* |
Persistence:
1.000
Half-life:
60273 days
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