A CUSUM Control Chart for Fuzzy Quality Data.

Based on the concept of fuzzy random variables, we propose an optimal representative value for fuzzy quality data by means of a combination of a random variable with a measure of fuzziness. Applying the classical Cumulative Sum (CUSUM) chart for these representative values, an univariate CUSUM control chart concerning LR-fuzzy data under independent observations is constructed. [ABSTRACT FROM AUTHOR]