Quality Control Data Evaluation: Tolerance Ellips Expression of Youden Plot

Abstract

Quality control survey results are classified into several groups, and a tole rance ellips is plotted on X-Y chart for each group instead of the Youden plot. Systemic error and random error of each group are easily recognizable by inspection of the chart. Number of data in a group more than 30 is required in order to obtain the stable ellips and to elucidate appropriate survey evaluation.