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V-Lab

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

Volatility prediction for Monday, July 27th, 2026

1 Day

4.67%

decreased by 0.06%

1 Week

4.68%

decreased by 0.05%

1 Month

4.71%

decreased by 0.02%

Analysis last updated: Friday, July 24, 2026 at 10:37 PM UTC

Date Range:

from

to

6M ·

1Y ·

2Y ·

5Y ·

10Y ·

All

graph of iShares National AMT-Free Muni Bond ETF S0GARCH

News Impact Curve

How returns affect tomorrow's volatility

Volatility Forecast

How volatility evolves over time

Parameter Estimates

Sep 10, 2007 to Jul 24, 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 61 trading days.

τ

Zero Slope Spline-GARCH Model

Tap to view equation

ParameterValuet-statistic
ω

const

Unconditional variance weight

1.7470
3.36***
α

ARCH

Response to squared shocks

0.1641
10.68***
β

GARCH

Volatility persistence

0.8247
59.97***
γi Spline Coefficients
K=1
γ10.0025
2.80***

Persistence:

0.989

Half-life:

61 days