Group Level Imputation of Statistic Maps (version 1.0) is a toolkit that performs multiple imputation for group level, single sample t-tests. Whole brain group level statistic maps from fMRI rarely cover the entire brain as a result of missing data. Missingness between subjects in fMRI datasets can result from susceptibility artifacts, bounding box (acquisition parameters), and small differences in post-normalized morphology. The toolkit consists of several interactive command line scripts that guide the user to map the spatial distribution of missing data across contrast images, calculate spatial neighborhood averages that help impute values, perform conventional and multiple imputed t-statistics, save the results to brain maps, and create result tables. The toolkit contains an instruction manual (pdf), two Matlab scripts and one R-Statistics script, which depend on functions defined in the popular SPM toolbox and functions defined in the MICE package for [R].
The GNU General Public License; see: http://www.gnu.org/copyleft/gpl.html
The GPL requires that source code to a tool or resource be made available, and that modified versions of the tool or resource (including new tools which include part of the original tool's source) make the modified source available to users.
A developer of a tool or resource distributed under the GPL ensures that users of the tool and of modified versions of the tool may always inspect the source code and modify the source to suit their needs, and that users may modify the tool as they see fit without being obliged to distribute their changes. While this may seem to encourage multiple versions of the same tool, the result is often that changes are passed back to the tool originator and incorporated into the original tool.