V-Lab
Inpex Corp Zero Slope Spline-GARCH Volatility Analysis
Volatility prediction for Thursday, September 24th, 2026
1 Day
34.43%
decreased by 1.48%
1 Week
34.69%
decreased by 1.22%
1 Month
35.58%
decreased by 0.33%
Analysis last updated: Sunday, September 20, 2026 at 12:00 AM UTC
News Impact Curve
How returns affect tomorrow's volatilityVolatility Forecast
How volatility evolves over timeParameter Estimates
Nov 17, 2004 to Sep 18, 2026Model 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 31 trading days.
τ
Zero Slope Spline-GARCH Model
Tap to view equation
Time-varying baseline: volatility reverts to a slowly-shifting spline trend
| Param | Value | t-stat |
|---|---|---|
| ωconst | 1.0544 | 9.12*** |
| αARCH | 0.0891 | 5.49*** |
| βGARCH | 0.8889 | 47.48*** |
Spline Coefficients
K=1
| γ1 | 0.0000 | 0.05 |
0.978
Persistence31d
Half-lifeτ
Zero Slope Spline-GARCH Model
Tap to view equation
| Parameter | Value | t-statistic |
|---|---|---|
ω const Unconditional variance weight | 1.0544 | 9.12*** |
α ARCH Response to squared shocks | 0.0891 | 5.49*** |
β GARCH Volatility persistence | 0.8889 | 47.48*** |
Spline Coefficients
K=1
| γ1 | 0.0000 | 0.05 |
Persistence:
0.978
Half-life:
31 days
Other Inpex Corp Analyses
Other Zero Slope Spline-GARCH Analyses on International Equities