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V-Lab
V-Lab

Zhihu Inc Zero Slope Spline-GARCH Volatility Analysis

Volatility prediction for Friday, September 11th, 2026

1 Day

70.45%

decreased by 18.54%

1 Week

63.09%

decreased by 25.90%

1 Month

53.64%

decreased by 35.35%

Analysis last updated: Friday, September 11, 2026 at 07:17 PM UTC

Date Range:

from

to

6M ·

1Y ·

2Y ·

All

graph of Zhihu Inc S0GARCH

News Impact Curve

How returns affect tomorrow's volatility

Volatility Forecast

How volatility evolves over time

Parameter Estimates

Apr 22, 2022 to Sep 4, 2026

Model Insight

This model fits a time-varying baseline (a spline), so volatility mean-reverts toward a slowly-shifting long-run level rather than a constant. Short-run deviations decay with a half-life of 3 trading days.

τ

Zero Slope Spline-GARCH Model

Tap to view equation

Time-varying baseline: volatility reverts to a slowly-shifting spline trend
ParamValuet-stat
ωconst1.6597
5.90***
αARCH0.2232
2.62***
βGARCH0.5367
4.63***
γi Spline Coefficients
K=1
γ10.0638
3.95***

0.760

Persistence

3d

Half-life
τ

Zero Slope Spline-GARCH Model

Tap to view equation

ParameterValuet-statistic
ω

const

Unconditional variance weight

1.6597
5.90***
α

ARCH

Response to squared shocks

0.2232
2.62***
β

GARCH

Volatility persistence

0.5367
4.63***
γi Spline Coefficients
K=1
γ10.0638
3.95***

Persistence:

0.760

Half-life:

3 days