Compute repetition spacing time based features from input data CF..Time. and/or CF..reltime.
which will be automatically computed from Duration..sec. if not present themselves.
computeSpacingPredictors(data, KCs)data which is the same frame with the added spacing relevant columns.
is a dataset with Anon.Student.Id and CF..ansbin.
are the components for which spaced features will be specified in LKT