Each measure is ranked as its direction declares: by larger values, by
larger absolute values, or by smaller values; a measure with direction
"none" is listed by decreasing value. A variable's summary is the mean of
its available scores across resamples, computed by
rtemis.draw::summarize_varimp(); an "absolute" measure ranks by the
absolute value of that mean. NA scores and resamples without importance are
excluded. A measure with no available score is omitted.
The table is in rank order within each measure, and in resample order
within each variable, so the rows of the first n ranks of a measure are
the rows of the n most important variables.