actually, let me clarify. for missing vars that are continuous, use NaN or nan (not zero). for discretes, there is not an equivalent easy way to indicate missing data. this is a feature i should add (maybe look for the keyword MISSING or something like that), so what i do in these instances is just comment-out that subject in the qdec.table.dat by putting the # char on that subject line. this of course in not very interactive, as you would need to re-edit and restart qdec to change the analysis.
n.
On Thu, 2010-09-09 at 11:20 -0400, Nick Schmansky wrote:
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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