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ProShares Ultra VIX Short-Term Futures ETF MEM Volatility Analysis

Volatility prediction for Monday, September 28th, 2026

1 Day

67.97%

decreased by 0.18%

1 Week

78.49%

increased by 10.34%

1 Month

98.54%

increased by 30.39%

Analysis last updated: Friday, September 25, 2026 at 11:01 PM UTC

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graph of ProShares Ultra VIX Short-Term Futures ETF MEM

News Impact Curve

How returns affect tomorrow's volatility

Volatility Forecast

How volatility evolves over time

Parameter Estimates

Nov 8, 2011 to Sep 25, 2026
Boundary Parameters

Model Insight

Volatility shocks decay with a half-life of 7 trading days, meaning a shock loses half its impact after approximately 7 days.

μ

MEM Model

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Shock decay: Shocks decay with a 7-day half-life
ParamValuet-stat
ωconst5.0000
4.85***
αARCH0.4157
10.16***
βGARCH0.4941
15.84***

0.910

Persistence

7d

Half-life
μ

MEM Model

Tap to view equation

ParameterValuet-statistic
ω

const

Unconditional variance weight

5.0000
4.85***
α

ARCH

Response to squared shocks

0.4157
10.16***
β

GARCH

Volatility persistence

0.4941
15.84***

Persistence:

0.910

Half-life:

7 days