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Permian Basin Royalty Trust Spline ILLIQ Liquidity Analysis

High-persistence model: shocks decay very slowly, so the theoretical long-run value may not be practically meaningful

Illiquidity prediction for Friday, October 30th, 2026

1 Day

5,534.88

increased by 476.21

1 Week

5,281.09

increased by 222.42

1 Month

4,698.05

decreased by 360.62

Analysis last updated: Thursday, October 29, 2026 at 11:29 PM UTC

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Date Range:

from

10/29/2024

to

10/29/2026

6M ·

1Y ·

2Y ·

5Y ·

10Y ·

All

graph of Permian Basin Royalty Trust ILLIQ-SMEM

News Impact Curve

How returns affect tomorrow's illiquidity

Illiquidity Forecast

How illiquidity evolves over time

Parameter Estimates

Jan 2, 1990 to Oct 23, 2026

Model Insight

With persistence 1.000, illiquidity shocks have a half-life of 77016 trading days (~305.6 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 1.000, shock half-life ~77016 days
ParamValuet-stat
ωconst1.1072
0.32
αARCH0.0718
0.03
βGARCH0.9282
0.35
∑γi Spline Coefficients
K=5
γ1-0.2011
-0.05
γ20.1507
0.02
γ30.1830
0.04
γ4-0.1931
-0.06
γ50.0531
0.10

1.000

Persistence

77016d

Half-life
μ

ILLIQ-SMEM Model

Tap to view equation

ParameterValuet-statistic
ω

const

Unconditional variance weight

1.1072
0.32
α

ARCH

Response to squared shocks

0.0718
0.03
β

GARCH

Volatility persistence

0.9282
0.35
∑γi Spline Coefficients
K=5
γ1-0.2011
-0.05
γ20.1507
0.02
γ30.1830
0.04
γ4-0.1931
-0.06
γ50.0531
0.10

Persistence:

1.000

Half-life:

77016 days