V-Lab
India NSE Volatility Index GAS-GARCH Student T Volatility Analysis
Volatility prediction for Friday, August 21st, 2026
1 Day
64.45%
increased by 5.98%
1 Week
66.60%
increased by 8.13%
1 Month
73.11%
increased by 14.64%
Analysis last updated: Friday, August 21, 2026 at 08:14 PM UTC
News Impact Curve
How returns affect tomorrow's volatilityVolatility Forecast
How volatility evolves over timeParameter Estimates
Mar 3, 2008 to Apr 4, 2025Model Insight
Volatility shocks decay with a half-life of 20 trading days, meaning a shock loses half its impact after approximately 20 days. Returns follow a Student-t distribution with v = 3.94 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 | 33.7471 | 5.72*** |
α ARCH Response to squared shocks | 0.0635 | 19.98*** |
β GARCH Volatility persistence | 0.9665 | 198.37*** |
ν DF Student-t tail thickness | 3.9399 | 6.47*** |
Persistence:
0.966
Half-life:
20 days
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