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Ballard Power Systems Inc Zero Slope Spline-GARCH Volatility Analysis

Volatility prediction for Monday, September 14th, 2026

1 Day

64.13%

decreased by 5.14%

1 Week

68.37%

decreased by 0.90%

1 Month

75.14%

increased by 5.87%

Analysis last updated: Friday, September 11, 2026 at 10:04 PM UTC

Date Range:

from

to

6M ·

1Y ·

2Y ·

5Y ·

10Y ·

All

graph of Ballard Power Systems Inc S0GARCH

News Impact Curve

How returns affect tomorrow's volatility

Volatility Forecast

How volatility evolves over time

Parameter Estimates

Nov 8, 1995 to Sep 11, 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 4 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
ωconst0.5960
4.82***
αARCH0.1918
5.73***
βGARCH0.6639
14.62***
γi Spline Coefficients
K=9
γ10.0109
0.18
γ2-0.0725
-0.80
γ30.0854
1.20
γ4-0.0244
-0.39
γ50.0347
0.53
γ6-0.1133
-1.37
γ70.1599
2.12**
γ8-0.1239
-2.31**
γ90.0517
1.48

0.856

Persistence

4d

Half-life
τ

Zero Slope Spline-GARCH Model

Tap to view equation

ParameterValuet-statistic
ω

const

Unconditional variance weight

0.5960
4.82***
α

ARCH

Response to squared shocks

0.1918
5.73***
β

GARCH

Volatility persistence

0.6639
14.62***
γi Spline Coefficients
K=9
γ10.0109
0.18
γ2-0.0725
-0.80
γ30.0854
1.20
γ4-0.0244
-0.39
γ50.0347
0.53
γ6-0.1133
-1.37
γ70.1599
2.12**
γ8-0.1239
-2.31**
γ90.0517
1.48

Persistence:

0.856

Half-life:

4 days