PowerPoint Presentation - Time Series Analysis in AFNI

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Recent Upgrades - 3

• Matrix inputs for -glt option can now indicate lots of zero entries using a notation like 30@0 1 -1 0 0 to indicate that 30 zeros precede the rest of the input line

H Example: 10 imaging runs and -polort 2 for baseline

H Can put comments into matrix and .1D files, using lines that start with ‘#’ or ‘//’

H Can use ‘ \’ at end of line to specify continuation

• Matrix input for GLTs can also be expressed symbolically, using the names given with the -stim_label options:

-stim_label 1 Ear -stim_maxlag 1 4

-stim_label 2 Wax -stim_maxlag 2 4

H Old style GLT might be

{zeros for baseline} 0 0 1 1 1 0 0 -1 -1 -1

H New style (via -gltsym option) is

Ear[2..4] -Wax[2..4]

Sum of Ear – Sum of Wax (lags 2..4)