V-Lab
Ishares Core Sp500 IDX (Cad) GAS-GARCH Student T Volatility Analysis
Volatility prediction for Tuesday, September 29th, 2026
1 Day
12.32%
increased by 0.49%
1 Week
12.55%
increased by 0.72%
1 Month
13.35%
increased by 1.52%
Analysis last updated: Tuesday, September 29, 2026 at 09:09 AM UTC
News Impact Curve
How returns affect tomorrow's volatilityVolatility Forecast
How volatility evolves over timeParameter Estimates
May 29, 2001 to Sep 25, 2026Model Insight
Volatility shocks decay with a half-life of 55 trading days, meaning a shock loses half its impact after approximately 55 days. Returns follow a Student-t distribution with v = 7.18 degrees of freedom, capturing fatter tails than a normal distribution.
𝑓
GAS-GARCH-T Model
Tap to view equation
Shock decay: Shocks decay with a 55-day half-lifev = 7.18 · fat tails
| Param | Value | t-stat |
|---|---|---|
| ωconst | 1.5065 | 1.48 |
| αARCH | 0.1067 | 8.80*** |
| βGARCH | 0.9874 | 107.30*** |
| νDF | 7.1798 | 1.85* |
0.987
Persistence55d
Half-life𝑓
GAS-GARCH-T Model
Tap to view equation
| Parameter | Value | t-statistic |
|---|---|---|
ω const Unconditional variance weight | 1.5065 | 1.48 |
α ARCH Response to squared shocks | 0.1067 | 8.80*** |
β GARCH Volatility persistence | 0.9874 | 107.30*** |
ν DF Student-t tail thickness | 7.1798 | 1.85* |
Persistence:
0.987
Half-life:
55 days
Other Ishares Core Sp500 IDX (Cad) Analyses
Other GAS-GARCH Student T Analyses on ETFs