**fScan Reference Manual, Chapter 2 (CmdLineOptions): ttest**
===== Ttest -- Generate t-test or simple threshold maps=====
**usage: -ttest [verbose] [phase] conda condb refvarb outnam outtype thresh1 thresh2 flag**
===== =====
Normally, this performs a t-Test for each voxel comparing conditions CONDA minus CONDB in REFVARB. CONDA and CONDB can be specified as condition code values or as condition names (see the [[jvs:fscan:manual:chapter2:reference|REFERENCE]] command). (Note: numbered conditions start with condition 1).

The input data set can be a functional 4-D image time series, or it can be 5-D "accumulated" mean and stdev time series (datatype=SUMSUMSQ) as created by the [[jvs:fscan:manual:chapter2:movie|MOVIE ACCUMULATE]] command.
 
  * REFVARB - One of the reference condition variables (see REF_CONDS below). The default task is 'task1'.
  * OUTNAM - Used to specifiy a data file in which to store the maps.
  * OUTTYPE - The pixel data type of the output file (OUT); default PTYPE is float.
  * THRESH1 - The starting threshold level X 100; default THRESH is 40 (i.e. 0.4). 
  * THRESH2
  * FLAG

Note: If "verbose" appears immediately after TTEST, the command will display image sorting information before it executes.

If "phase" is included as the first argument (not counting "verbose"), a phase map will be generated in addition to the t-map.  The phase map

**See Also:**\\
[[jvs:fscan|fScan Home]], 
[[jvs:fscan:manual|fScan Manual]], 
[[jvs:fscan:manual:chapter2|CmdLineOptions]], 
[[jvs:fscan:manual:help|Manual Help]]