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Shell Plc Spline ILLIQ Liquidity Analysis

Illiquidity prediction for Friday, September 11th, 2026

1 Day

4,460.12

decreased by 193.67

1 Week

4,858.49

increased by 204.70

1 Month

6,175.02

increased by 1,521.23

Analysis last updated: Friday, September 11, 2026 at 07:13 PM UTC

Date Range:

from

to

6M ·

1Y ·

2Y ·

5Y ·

10Y ·

All

graph of Shell Plc ILLIQ-SMEM

News Impact Curve

How returns affect tomorrow's illiquidity

Illiquidity Forecast

How illiquidity evolves over time

Parameter Estimates

Jan 10, 2013 to Sep 4, 2026

Model Insight

With persistence 0.998, illiquidity shocks have a half-life of 336 trading days (~1.3 years), close to a unit root, so long-run forecasts are highly sensitive to this estimate.

μ

ILLIQ-SMEM Model

Tap to view equation

High persistence: persistence 0.998, shock half-life ~336 days
ParamValuet-stat
ωconst1.0588
6.90***
αARCH0.0919
11.10***
βGARCH0.9060
112.09***
γi Spline Coefficients
K=1
γ1-0.0065
-0.47

0.998

Persistence

336d

Half-life
μ

ILLIQ-SMEM Model

Tap to view equation

ParameterValuet-statistic
ω

const

Unconditional variance weight

1.0588
6.90***
α

ARCH

Response to squared shocks

0.0919
11.10***
β

GARCH

Volatility persistence

0.9060
112.09***
γi Spline Coefficients
K=1
γ1-0.0065
-0.47

Persistence:

0.998

Half-life:

336 days