V-Lab
Proshares S&P 500 EX-Technology ETF GAS-GARCH Student T Volatility Analysis
Volatility prediction for Wednesday, September 30th, 2026
1 Day
895.80%
decreased by 122.54%
1 Week
893.70%
decreased by 124.64%
1 Month
885.37%
decreased by 132.97%
Analysis last updated: Tuesday, September 29, 2026 at 09:57 PM UTC
News Impact Curve
How returns affect tomorrow's volatilityVolatility Forecast
How volatility evolves over timeParameter Estimates
Sep 24, 2015 to Sep 25, 2026Model Insight
The estimated Student-t degrees of freedom v = 2.00 sit at the infinite-variance boundary (v → 2): the model is attributing extreme moves to heavy tails rather than to volatility, so the volatility scale is unreliable here. See the boundary-parameters flag.
𝑓
GAS-GARCH-T Model
Tap to view equation
Unreliable tails: v = 2.00 sits at the infinite-variance boundary
| Param | Value | t-stat |
|---|---|---|
| ωconst | 16.7735 | 3.84*** |
| αARCH | 0.0921 | 32.93*** |
| βGARCH | 0.9976 | 1,563.70*** |
| νDF | 2.0001 |
0.998
Persistence293d
Half-life𝑓
GAS-GARCH-T Model
Tap to view equation
| Parameter | Value | t-statistic |
|---|---|---|
ω const Unconditional variance weight | 16.7735 | 3.84*** |
α ARCH Response to squared shocks | 0.0921 | 32.93*** |
β GARCH Volatility persistence | 0.9976 | 1,563.70*** |
ν DF Student-t tail thickness | 2.0001 |
Persistence:
0.998
Half-life:
293 days
Other Proshares S&P 500 EX-Technology ETF Analyses
Other GAS-GARCH Student T Analyses on ETFs