Ordered Data Sequence You can order a data sequence by providing a permutation such that xπ(1)≤...≤xπ(n)x_{\pi(1)}\leq ...\leq x_{\pi(n)}xπ(1)≤...≤xπ(n) (i):=π(i)(i):=\pi(i)(i):=π(i) is called the ordered data sequence.