SYNOPSIS

ttest [options] imageX0 [imageX1 ...] -- imageY0 [imageY1] ... ttest [options] --symmetric imageX0 [imageX1 ...]

DESCRIPTION

Pixelwise tests of statistical significance. Also compute correlations and z-scores

OPTIONS

Global Toolkit Options (these are shared by all CMTK tools)

--help

Write list of basic command line options to standard output.

--help-all

Write complete list of basic and advanced command line options to standard output.

--wiki

Write list of command line options to standard output in MediaWiki markup.

--man

Write man page source in 'nroff' markup to standard output.

--version

Write toolkit version to standard output.

--echo

Write the current command line to standard output.

--verbose-level <integer>

Set verbosity level.

--verbose, -v

Increment verbosity level by 1 (deprecated; supported for backward compatibility).

--threads <integer>

Set maximum number of parallel threads (for POSIX threads and OpenMP).

Main Options

--log, -l

Use log data for testing

--abs, -a

Use absolute data for testing

--abs-out, -A

Generate absolute (unsigned) data

--invert, -i

Invert data, i.e., subtract from 1.0

--short, -s

Convert probabilities to short (and scale by 1000)

--paired, -p

Compute paired t-test [default: groupwise]

--cross-correlation, -c

Compute paired cross-correlation

--zscores, -Z

Compute z-scores of test (y) distribution averages

--text, -t

Text file input and output rather than image files.

--mask <string>, -m <string>

Mask file name [Default: NONE]

--outfile <string>, -o <string>

Output file name [Default: ttest.nii]

--tstats-file <string>

T-statistics output file name (for correlation: p-value output file) [Default: NONE]

AUTHORS

Torsten Rohlfing, with contributions from Michael P. Hasak, Greg Jefferis, Calvin R. Maurer, Daniel B. Russakoff, and Yaroslav Halchenko

LICENSE

http://www.fsf.org/licensing/licenses/gpl.html

ACKNOWLEDGMENTS

CMTK is developed with support from the NIAAA under Grant AA021697, National Consortium on Alcohol and Neurodevelopment in Adolescence (N-CANDA): Data Integration Component. From April 2009 through September 2011, CMTK development and maintenance was supported by the NIBIB under Grant EB008381.