S&P 500 Equal Weight Index (EWI) Zero Slope Spline-GARCH Volatility Analysis
Volatility prediction for Tuesday, April 21st, 2026
1 Day
14.86%
decreased by 0.66%
1 Week
15.03%
decreased by 0.49%
1 Month
15.58%
increased by 0.06%
Analysis last updated: Monday, April 20, 2026 at 11:02 PM UTC
News Impact Curve
How returns affect tomorrow's volatilityVolatility Forecast
How volatility evolves over timeParameter Estimates
| param | t-stat | |
|---|---|---|
| 1.3474 | 7.37 | |
| 0.1007 | 9.50 | |
| 0.8720 | 71.99 | |
| 0.0803 | 5.63 | |
| -0.1190 | -5.22 | |
| 0.0605 | 3.69 | |
| -0.0462 | -3.11 | |
| 0.0488 | 3.01 | |
| -0.0343 | -2.79 |
Estimation Period:
Jan 1, 1990 to Apr 17, 2026
Jan 1, 1990 to Apr 17, 2026
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