Re: [Freesurfer] Symbol to indicate a missing value for a discrete variable in a qdec data table

use

NaN

or

nan

to indicate a missing data point. when a variable is selected as a factor, any subjects with missing data points will automatically be excluded from the analysis.

n.

On Thu, 2010-09-09 at 10:59 -0400, Robustelli, Briana (NIH/NIMH) [F] wrote:

Hello, I am new to freesurfer and have created a qdec data table but have a few missing data points for a discrete variable. When using a continuous variable placeholder zeros are used. What should be typed into the table to indicate a data point is missing for a discrete variable? Thank you.

Briana

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