State Street SPDR Bloomberg 1-3 Month T-Bill ETF 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 Tuesday, May 26th, 2026
1 Day
0.41%
unchanged at 0.00%
1 Week
0.42%
increased by 0.01%
1 Month
0.42%
increased by 0.01%
Analysis last updated: Friday, May 22, 2026 at 10:09 PM UTC
News Impact Curve
How returns affect tomorrow's volatilityVolatility Forecast
How volatility evolves over timeParameter Estimates
| param | t-stat | |
|---|---|---|
| 0.0000 | 3.00 | |
| 0.0608 | 9.36 | |
| 0.9524 | 252.36 | |
| -0.0264 | -3.19 |
Estimation Period:
May 30, 2007 to May 22, 2026
May 30, 2007 to May 22, 2026
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