การศึกษาประสิทธิภาพของแผนภูมิควบคุม p, Ewma และ Isrt p ewma

Abstract

The objective of this research evaluation of the performance of fraction nonconforming control charts, such as p chart, Ewma chart and Isrt p ewma chart. The standard fraction nonconforming (p₀) considered are 0.04, 0.06, 0.08 and 0.1. The shift of fraction nonconforming (δ) are 0.0, 0.01, 0.05, 0.1, 0.5, 1.0 and 2.0. Sample sizes (n) are 50, 100, 200 and 300. For each studied situation, two criteria were used to decide: Type I error and Average Run Length (ARL₁). The results of this study were as follows: p chart has the most efficient in the case of n = 300 and δ = 2.0. For Ewma chart and Isrt p ewma chart the most efficient in the case of all p₀, when δ = 2.0 and n = 300 and 50 respectively.