Hi Marco, no, there's not a way to get 95% conf intervals out of it. sorry, doug

Marco Loggia, PhD wrote:

Thanks Bruce for your prompt reply.

The surfaces I feed to mris_anatomical_stats are actually not thickness data, but quantitative CBF maps, calculated using arterial spin labeling.

I am trying to extract, for each subject, the average CBF value across the whole cortical surface. Considering this, the dispersion should be the SD of the CBF across all vertices, right?

Is it not possible to obtain 95% C.I. instead of the SD?

Marco

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Marco L. Loggia, PhD Postdoctoral Fellow, Mass General Hospital & Brigham and Women's Hospital Harvard Medical School

CNY Building 120, suite 101E Charlestown, Massachusetts 02129 Phone: (617) 643-7267 Fax: (617) 643-7340 marco@nmr.mgh.harvard.edu

-----Original Message----- From: Bruce Fischl [mailto:fischl@nmr.mgh.harvard.edu] Sent: Wednesday, February 16, 2011 11:52 AM To: Marco Loggia, PhD Cc: freesurfer@nmr.mgh.harvard.edu Subject: Re: [Freesurfer] output of mris_anatomical_stats

Hi Marco

that is the spatial standard deviation, which probably isn't a very interesting #. Typically the more interesting variance is cross subject.

cheers Bruce

On Wed, 16 Feb 2011, Marco Loggia, PhD wrote:

...

Dear all,

In mris_anatomical_stats, the "average cortical thickness" value comes with a measure of dispersion around the mean. Is this Standard Deviation? If so, is there a way to plot the 95% confidence intervals

instead?

...

Thanks,

Marco

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Marco L. Loggia, PhD

Postdoctoral Fellow, Mass General Hospital & Brigham and Women's Hospital

Harvard Medical School

CNY Building 120, suite 101E

Charlestown, Massachusetts 02129

Phone: (617) 643-7267

Fax: (617) 643-7340 marco@nmr.mgh.harvard.edu

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