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V-Lab

iShares National AMT-Free Muni Bond ETF Spline-GARCH Volatility Analysis

Volatility prediction for Tuesday, July 14th, 2026

1 Day

2.96%

decreased by 0.11%

1 Week

3.09%

increased by 0.02%

1 Month

3.52%

increased by 0.45%

Analysis last updated: Monday, July 13, 2026 at 09:44 PM UTC

Date Range:

from

to

6M ·

1Y ·

2Y ·

5Y ·

10Y ·

All

graph of iShares National AMT-Free Muni Bond ETF SGARCH

News Impact Curve

How returns affect tomorrow's volatility

Volatility Forecast

How volatility evolves over time

Parameter Estimates

Sep 10, 2007 to Jul 10, 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 39 trading days.

τ

Spline-GARCH Model

Tap to view equation

ParameterValuet-statistic
ω

const

Unconditional variance weight

1.7762
4.28***
α

ARCH

Response to squared shocks

0.1619
9.95***
β

GARCH

Volatility persistence

0.8205
55.37***
γi Spline Coefficients
K=1
γ10.0084
2.89***

Persistence:

0.982

Half-life:

39 days