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   -> Volume 7, Issue 6

Answer: Maximum Absolute Deviation? (WD 7.5 #40)
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Paul Costa (

PostPosted: Tue Jun 30, 1998 6:12 pm    
Subject: Answer: Maximum Absolute Deviation? (WD 7.5 #40)
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#20 Answer: Maximum Absolute Deviation? (WD 7.5 #40)

The question was:

> Date: Sat, 16 May 1998 13:49:38 +0800
> From: Liu Bin <>
> Subject: #40 Question: Maximum Absolute Deviation?
> Hi everyone,
> Would you please tell me something about the Maximum Absolute
> Deviation method in WNOISEST.M in MATLAB v5.0 WAVELET TOOLBOX, or
> about how to estimate noise level via wavelet transform in order to
> use the WDEN.M denoising method?
> Thanks.

The answer is:

There is a misprint in the on-line help of the wnoisest function and
in the associated description shown on page 8-190 of the User's
Guide (1997). The line which reads:

The estimator used is Maximum Absolute Deviation / 0.6745, ...

should read:

The estimator used is Median Absolute Deviation / 0.6745, ...

We will correct this in a future version of the Wavelet Toolbox
and the User's Guide.

Best Regards,

Paul Costa
The MathWorks, Inc.
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