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AT&T Inc 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 Monday, September 28th, 2026

1 Day

10.72

decreased by 0.66

1 Week

11.80

increased by 0.42

1 Month

12.82

increased by 1.44

Analysis last updated: Saturday, September 26, 2026 at 12:44 AM UTC

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graph of AT&T Inc ILLIQ-SMEM

News Impact Curve

How returns affect tomorrow's illiquidity

Illiquidity Forecast

How illiquidity evolves over time

Parameter Estimates

Jan 2, 1990 to Sep 25, 2026

Model Insight

With persistence 1.000, illiquidity shocks have a half-life of 346573 trading days (~1375.3 years), close to a unit root, so long-run forecasts are highly sensitive to this estimate.

μ

ILLIQ-SMEM Model

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High persistence: persistence 1.000, shock half-life ~346573 days
ParamValuet-stat
ωconst1.3860
0.49
αARCH0.1023
0.05
βGARCH0.8977
0.47
∑γi Spline Coefficients
K=2
γ10.0161
0.02
γ2-0.0586
-0.53

1.000

Persistence

346573d

Half-life
μ

ILLIQ-SMEM Model

Tap to view equation

ParameterValuet-statistic
ω

const

Unconditional variance weight

1.3860
0.49
α

ARCH

Response to squared shocks

0.1023
0.05
β

GARCH

Volatility persistence

0.8977
0.47
∑γi Spline Coefficients
K=2
γ10.0161
0.02
γ2-0.0586
-0.53

Persistence:

1.000

Half-life:

346573 days