The use of kernel density estimation (KDE) methods to address the issue of
control under process uncertainty and unreliability is investigated. It is
shown how the KDE-derived joint probability density function of plant opera
tional data can be used to assist in this task. It is also shown how the es
timated density function can be used to support robust inference of importa
nt plant variables in addition to the detection and isolation of faults. (C
) 2000 Elsevier Science Ltd. All rights reserved.