Product Quality Control in Reduced Dimensional Spaces

Effective control of quality variables in high-dimensional processes is considered. Because of the high dimension of the output space, control of a subset of the quality variables is often practiced, to indirectly control the entire quality space. An example of this type of situation is the control of the full molecular weight distribution (MWD). Often, indirect control of the MWD, for example, by controlling an average of the distribution, is …