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Great Portland Estates PLC Spline ILLIQ Liquidity Analysis

Illiquidity prediction for Monday, August 3rd, 2026

1 Day

4,934.67

increased by 44.44

1 Week

4,930.25

increased by 40.02

1 Month

5,217.58

increased by 327.35

Analysis last updated: Sunday, August 2, 2026 at 10:21 AM UTC

Date Range:

from

to

6M ·

1Y ·

2Y ·

5Y ·

10Y ·

All

graph of Great Portland Estates PLC ILLIQ-SMEM

News Impact Curve

How returns affect tomorrow's illiquidity

Illiquidity Forecast

How illiquidity evolves over time

Parameter Estimates

Jan 11, 1991 to Jul 31, 2026

Model Insight

With persistence 0.994, illiquidity shocks have a half-life of 119 trading days (~0.5 years), close to a unit root, so long-run forecasts are highly sensitive to this estimate.

μ

ILLIQ-SMEM Model

Tap to view equation

ParameterValuet-statistic
ω

const

Unconditional variance weight

0.9904
2.68***
α

ARCH

Response to squared shocks

0.0495
8.01***
β

GARCH

Volatility persistence

0.9447
139.71***
γi Spline Coefficients
K=5
γ1-0.1062
-3.37***
γ20.1414
3.04***
γ3-0.0406
-1.58
γ40.0105
0.60
γ50.0365
1.48

Persistence:

0.994

Half-life:

119 days