V-Lab
Zhihu Inc GAS-GARCH Student T Volatility Analysis
Volatility prediction for Friday, September 11th, 2026
1 Day
68.61%
decreased by 5.00%
1 Week
68.68%
decreased by 4.93%
1 Month
68.91%
decreased by 4.70%
Analysis last updated: Friday, September 11, 2026 at 07:17 PM UTC
News Impact Curve
How returns affect tomorrow's volatilityVolatility Forecast
How volatility evolves over timeParameter Estimates
Apr 22, 2022 to Sep 4, 2026Model Insight
Volatility shocks decay with a half-life of 25 trading days, meaning a shock loses half its impact after approximately 25 days. Returns follow a Student-t distribution with v = 4.54 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 25-day half-lifev = 4.54 · fat tails
| Param | Value | t-stat |
|---|---|---|
| ωconst | 19.3888 | 0.75 |
| αARCH | 0.1034 | 4.11*** |
| βGARCH | 0.9722 | 23.20*** |
| νDF | 4.5392 | 1.16 |
0.972
Persistence25d
Half-life𝑓
GAS-GARCH-T Model
Tap to view equation
| Parameter | Value | t-statistic |
|---|---|---|
ω const Unconditional variance weight | 19.3888 | 0.75 |
α ARCH Response to squared shocks | 0.1034 | 4.11*** |
β GARCH Volatility persistence | 0.9722 | 23.20*** |
ν DF Student-t tail thickness | 4.5392 | 1.16 |
Persistence:
0.972
Half-life:
25 days
Other GAS-GARCH Student T Analyses on International Equities