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V-Lab

Xtrackers S&P 100 Ex Top 20 ETF GAS-GARCH Student T Volatility Analysis

Volatility prediction for Wednesday, July 22nd, 2026

1 Day

11.99%

decreased by 0.19%

1 Week

12.12%

decreased by 0.06%

1 Month

12.44%

increased by 0.26%

Analysis last updated: Tuesday, July 21, 2026 at 09:24 PM UTC

Date Range:

from

to

6M ·

1Y ·

2Y ·

All

graph of Xtrackers S&P 100 Ex Top 20 ETF GAS-GARCH-T

News Impact Curve

How returns affect tomorrow's volatility

Volatility Forecast

How volatility evolves over time

Parameter Estimates

Nov 28, 2022 to Jul 17, 2026

Model Insight

Volatility shocks decay with a half-life of 8 trading days, meaning a shock loses half its impact after approximately 8 days. Returns follow a Student-t distribution with v = 7.66 degrees of freedom, capturing fatter tails than a normal distribution.

𝑓

GAS-GARCH-T Model

Tap to view equation

ParameterValuet-statistic
ω

const

Unconditional variance weight

0.6564
11.78***
α

ARCH

Response to squared shocks

0.0649
8.74***
β

GARCH

Volatility persistence

0.9187
108.97***
ν

DF

Student-t tail thickness

7.6627
1.08

Persistence:

0.919

Half-life:

8 days