Difference between revisions of "Lab Manual:AFNI"
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==polort rule of thumb== | ==polort rule of thumb== | ||
Revision as of 12:30, 9 July 2008
polort rule of thumb
AFNI folks suggest that for every 150 seconds you should add a degree to the polynomial.
For a 150 second long scan, you would use -polort 1, for a 300 second scan, you would use -polort 2, and so forth.
3dRegAna
3dRegAna is an AFNI program which can be used to do multiple linear analysis
-model tag
The -model tag can be used to specifiy and test regression model
-model 1 : 0
will test Yi = B0 + B1X1i+ei vs. Yi = B0 + ei
-model 2 : 0
will test Yi = B0 + B2X2i+ei vs. Yi = B0 + ei
-model 2 : 1 0
will test Yi = B0 + B1X1i + B2X2i+ei vs. Yi = B0+ B1X1i + ei
-model 2 1 : 0
will test Yi = B0 + B1X1i + B2X2i+ei vs. Yi = B0+ei
