Quality-Control Chart based on Goodness-of-Fit Test

Abstract

DURING the course of detergency investigations involving the measurement of the reflectance of fabrics, the need arose for a rapid method of deciding whether the reflectance–frequency distribution of successive samples conformed to an expected distribution previously built up from a large number of such measurements. A suitable method based on the χ² goodness-of-fit test was devised; and it is thought that this may be useful to others concerned with frequency distributions, especially of non-normal types. The method is a form of quality control.