V-Lab
Warsaw Stock Exchange WIG Total Return Index GJR-GARCH Volatility Analysis
Volatility prediction for Friday, September 25th, 2026
1 Day
15.39%
decreased by 0.43%
1 Week
15.63%
decreased by 0.19%
1 Month
16.49%
increased by 0.67%
Analysis last updated: Friday, September 25, 2026 at 05:44 PM UTC
News Impact Curve
How returns affect tomorrow's volatilityVolatility Forecast
How volatility evolves over timeParameter Estimates
Apr 17, 1991 to Sep 18, 2026Model Insight
With persistence 0.991, volatility shocks have a half-life of 76 trading days (~0.3 years), close to a unit root, so long-run forecasts are highly sensitive to this estimate.
σ
GJR-GARCH Model
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High persistence: persistence 0.991, shock half-life ~76 days
| Param | Value | t-stat |
|---|---|---|
| ωconst | 0.0233 | 4.74*** |
| αARCH | 0.0542 | 3.87*** |
| βGARCH | 0.9233 | 95.06*** |
| γleverage | 0.0267 | 1.19 |
0.991
Persistence76d
Half-lifeσ
GJR-GARCH Model
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| Parameter | Value | t-statistic |
|---|---|---|
ω const Unconditional variance weight | 0.0233 | 4.74*** |
α ARCH Response to squared shocks | 0.0542 | 3.87*** |
β GARCH Volatility persistence | 0.9233 | 95.06*** |
γ leverage Additional response to negative shocks | 0.0267 | 1.19 |
Persistence:
0.991
Half-life:
76 days
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