[Y,INDEX] = sort(X,CRIT)
X [ tseries ] - Input tseries object whose columns will be sorted in order determined by the criterion crit.
CRIT [ 'sumsq' | 'sumabs' | 'max' | 'maxabs' | 'min' | 'minabs' ] - Criterion used to sort the input tseries object columns.
Y [ tseries ] - Output tseries object with columns sorted in order determined by the input criterion, CRIT.
INDEX [ numeric ] - Vector of indices, y = x{:,index}.