intent_p123.html
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intent_p1, intent_p2, intent_p3
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nifti1.h header documentation
STATISTICAL PARAMETRIC DATASETS (i.e., SPMs): -------------------------------------------- Values of intent_code from NIFTI_FIRST_STATCODE to NIFTI_LAST_STATCODE (inclusive) indicate that the numbers in the dataset should be interpreted as being drawn from a given distribution. Most such distributions have auxiliary parameters (e.g., NIFTI_INTENT_TTEST has 1 DOF parameter).
If the dataset DOES NOT have a 5th dimension, then the auxiliary parameters are the same for each voxel, and are given in header fields intent_p1, intent_p2, and intent_p3.
