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V-Lab
V-Lab

S&P GSCI Biofuel Spot Index Zero Slope Spline-GARCH Volatility Analysis

Volatility prediction for Wednesday, September 9th, 2026

1 Day

18.11%

decreased by 0.20%

1 Week

18.09%

decreased by 0.22%

1 Month

18.01%

decreased by 0.30%

Analysis last updated: Tuesday, September 8, 2026 at 11:30 PM UTC

Date Range:

from

to

6M ·

1Y ·

2Y ·

5Y ·

10Y ·

All

graph of S&P GSCI Biofuel Spot Index S0GARCH

News Impact Curve

How returns affect tomorrow's volatility

Volatility Forecast

How volatility evolves over time

Parameter Estimates

Jan 16, 1995 to Sep 8, 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 30 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
ωconst0.6867
5.52***
αARCH0.0587
8.82***
βGARCH0.9182
113.25***
γi Spline Coefficients
K=2
γ1-0.0044
-2.24**
γ20.0053
2.25**

0.977

Persistence

30d

Half-life
τ

Zero Slope Spline-GARCH Model

Tap to view equation

ParameterValuet-statistic
ω

const

Unconditional variance weight

0.6867
5.52***
α

ARCH

Response to squared shocks

0.0587
8.82***
β

GARCH

Volatility persistence

0.9182
113.25***
γi Spline Coefficients
K=2
γ1-0.0044
-2.24**
γ20.0053
2.25**

Persistence:

0.977

Half-life:

30 days