NAME

       ttest - T-tests

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

BUGS

       Report bugs at http://nitrc.org/projects/cmtk/

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.