====== bxh_eventstats ======

The output of bxh_eventstats (PREFIX_ is the output prefix specified when running bxh_eventstats):

  * PREFIX_LOG.txt  --  a log of all the external commands the program runs as well as some other data
  * PREFIX_LOG_EPOCHAVG.txt  --  a log from bxh_epochavg, which does most of the work
  * PREFIX_QUERIES.txt  --  a list of all the queries specified
  * PREFIX_baselineAvg.*  --  an average of all the points used as baselines for every trial
  * PREFIX_brainmask.*  --  if the "brainmask" option is specified, this is the mask

For each query with a label QUERYLABEL:

  * PREFIX_QUERYLABEL_avg.*  --  the raw averages of the time-locked epochs for each event that matched this query.
  * PREFIX_QUERYLABEL_avg_percent.*  --  same as above, but as a percentage of the mean image.
  * PREFIX_QUERYLABEL_n.*  --  the number of trials included (per voxel)
  * PREFIX_QUERYLABEL_std.*  --  stanard deviation of the time-locked epochs for each event that matched this query.
  * PREFIX_QUERYLABEL_std_percent.*  --  same as above, but as a percentage of the mean image.
  * PREFIX_QUERYLABEL_zerotmap.*  --  4-D result of a t-test of the _avg image against a zero time course.
  * PREFIX_QUERYLABEL_cor.*  --  if a response template is specified using the "template" option, then this is the 3-D image representing the correlation between the time courses in the _avg image and the response template
  * PREFIX_QUERYLABEL_tmap.*  --  the t-statistic corresponding to the above _cor image.

For each comparison specified using the "tcompare QUERY1-QUERY2" option:

  * PREFIX_QUERY1_vs_QUERY2_tmap.*  --  the t-statistic representing the significance of the difference between the epochs matching QUERY1 and the epochs matching QUERY2.

When running bxh_eventstats_combine, its output will include:

  * PREFIX_QUERYLABEL_avg.* -- as above, though now these represent the mean of all the relevant _avg.* files.
  * PREFIX_QUERYLABEL_avg_percent.* -- as above, though now these represent the mean of all the relevant _avg_percent.* files.
  * PREFIX_QUERYLABEL_tmap_zerottest.* and PREFIX_QUERY1_vs_QUERY2_tmap_zerottest.*:  this represents a t-test of the relevant tmaps against zero.
  * PREFIX_QUERYLABEL_pmap_weightedz.* and PREFIX_QUERY1_vs_QUERY2_pmap_weightedz.*:  this represents a weighted-z comparison of the relevant tmaps (see Whitlock, "Combining probability from independent tests: the weighted Z-method is superior to Fisher's approach", http://www.ncbi.nlm.nih.gov/pubmed/16135132 )