Compute the mean (or other aggregates) over all vertices of a subject from standard space morphometry data (like 'surf/lh.area.fwhm10.fsaverage.mgh'). Uses knowledge about the FreeSurfer directory structure to load the correct file.
group.morph.agg.standard(subjects_dir, subjects_list, measure, hemi, fwhm,
agg_fun = mean, template_subject = "fsaverage", format = "mgh",
cast = TRUE)string. The FreeSurfer SUBJECTS_DIR, i.e., a directory containing the data for all your subjects, each in a subdir named after the subject identifier.
string vector. A vector of subject identifiers that match the directory names within subjects_dir.
string. Name of the vertex-wise measure of morphometry data file. E.g., "area" or "thickness". Used to construct the name of the morphometry file to be loaded.
string, one of 'lh', 'rh' or 'both'. The hemisphere name. Used to construct the names of the annotation and morphometry data files to be loaded.
string. Smoothing as string, e.g. '10' or '25'.
function. An R function that aggregates data, typically max, mean, min or something similar. Note: this is NOT a string, put the function name without quotes. Defaults to mean.
string. Template subject name, defaults to 'fsaverage'.
string. One of 'mgh', 'mgz', 'curv'. Defaults to 'mgh'.
logical. Whether the columns should be database style, i.e., separate columns for everything.
dataframe with aggregated values for all subjects, with 2 columns and n rows, where n is the number of subjects. The 2 columns are 'subject_id' and '<hemi>.<measure>' (e.g., "lh.thickness"), the latter contains the aggregated data.
Other global aggregation functions: group.morph.agg.native,
group.multimorph.agg.native,
group.multimorph.agg.standard