:orphan: .. _ahelp_3dPval: ****** 3dPval ****** .. contents:: :local: | .. code-block:: none Usage: 3dPval [options] dataset * Converts a dataset's statistical sub-bricks to p-values. * Sub-bricks not internally marked as statistical volumes are unchanged. * However, all output volumes will be converted to float format! * If you wish to convert only sub-brick #3 (say) of a dataset, then something like this command should do the job: 3dPval -prefix Zork.nii InputDataset.nii'[3]' * Note that sub-bricks being marked as statistical volumes, and having value-to-FDR conversion curves attached, are AFNI-only ideas, and are not part of any standard, NIfTI or otherwise! In other words, this program will be useless for a random dataset which you download from some random non-AFNI-centric site :( * Also note that SMALLER p- and q-values are more 'significant', but that the AFNI GUI provides interactive thresholding for values ABOVE a user-chosen level, so using the GUI to threshold on a p-value or q-value volume will have the opposite result to what you might wish for. * Although the program now allows conversion of statistic values to z-scores or FDR q-values, instead of p-values, you can only do one type of conversion per run of 3dPval. If you want p-values AND q-values, you'll have to run this program twice. * Finally, 'sub-brick' is AFNI jargon for a single 3D volume inside a multi-volume dataset. Options: ======= -zscore = Convert statistic to a z-score instead, an N(0,1) deviate that represents the same p-value. -log2 = Convert statistic to -log2(p) -log10 = Convert statistic to -log10(p) -qval = Convert statistic to a q-value (FDR) instead: + This option only works with datasets that have FDR curves inserted in their headers, which most AFNI statistics programs will do. The program 3drefit can also do this, with the -addFDR option. -prefix p = Prefix name for output file (default name is 'Pval') AUTHOR: The Man With The Golden p < 0.000001 ++ Compile date = Mar 24 2024 {AFNI_24.0.17:linux_ubuntu_16_64}