Skelton, Robert E.Anderson, B. D.O.2026-01-022026-01-020020-7179ORCID:/0000-0002-1493-4774/work/174739990https://hdl.handle.net/1885/733803126This paper describes a class of reduced-order models that match both the first q-Markov parameters and the first q-output covariances for linear systems subject to white noise inputs. The class of reduced models contains the earlier models of Yousuff, Skelton and Wagie (1985) as a special case.Part of this research was sponsored by NSF INT-841244 under the U.S.-Australia Cooperative Program.14en198610.1080/002071786089336800022805596