ttest(1)

📦
version 3.3.1p2 · 7 versions
, in ubuntu stonking

💖 ttest(1) — bestie edition 💖

okay so real talk: this is ttest, one of the tools in The Computational Morphology Toolkit (CMTK, iykyk). it's a command-line girlie, it lives in your terminal, and she is so good at statistics. let's get into it 🫶

✨ NAME ✨

ttest — T-tests. that's it, that's the name, she's confident 💅

🌸 SYNOPSIS 🌸

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

like… she's flexible. you can give her a whole squad of imageX files, drop a --, and then hand her the imageY crew. or you go --symmetric and she only needs one squad. two moods, both iconic ✨

🦋 DESCRIPTION 🦋

so basically: this does pixelwise tests of statistical significance. every single pixel gets its own little moment of scrutiny. and if that wasn't enough, she also computes correlations and z-scores. multi-talented, no cap. 👑

🎀 OPTIONS 🎀

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

  • --help — prints the list of basic command line options to standard output. your lil starter pack.
  • --help-all — prints the complete list of basic and advanced command line options to standard output. the deluxe edition, the director's cut.
  • --wiki — prints the list of command line options to standard output in MediaWiki markup. for when you need her citably pretty.
  • --man — writes man page source in nroff markup to standard output. yes she can describe herself. main character energy fr.
  • --version — writes the toolkit version to standard output.
  • --echo — writes the current command line to standard output. she repeats you back, lovingly.
  • --verbose-level <integer> — sets the verbosity level.
  • --verbose, -v — increments verbosity level by 1. ⚠️ heads up bestie: this one is deprecated; it's only still here for backward compatibility. use --verbose-level instead.
  • --threads <integer> — sets the maximum number of parallel threads (for POSIX threads and OpenMP). she multitasks. obviously.

💅 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 is groupwise, jsyk.
  • --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. sometimes you just want text, periodt.
  • --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. an absolute legend lineup, we stan every single one of them 💜

⭐ LICENSE ⭐

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

go read it, bestie, it's your rights and they're cute.

💀 BUGS 💀

Report bugs at http://nitrc.org/projects/cmtk/. not me manifesting a bug report… but if you find one, tell the people, they'll fix it 🫶

🌸 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. the funding history has lore, and honestly we should respect it 💖

🧚 reminder bb: every flag, every default, every number up there is exact. don't freestyle with them. she's forgiving but the statistics are not 😭

and that's the whole page 🎀 this was CMTK 3.3.1p2, dated Jun 24 2026 — slay, iconic, no notes, bye bestie 💅✨

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