ANDERSON BDO, BDO2026-01-022026-01-02ORCID:/0000-0002-1493-4774/work/174739769https://hdl.handle.net/1885/733803089Estimation problem is formulated as one requiring the calculation of probability density functions of the states and parameters, with these density functions being '%'conditioned'%' on the plant measurements in the sense that they reflect all knowledge about the plant. Formulas are developed for updating the probability densities as further measurements become available.5en19690014482448