New Sensitizing Runs Rules for Shewhart type Control Charts with Applications

The Effect of Autocorrelation on the Shewhart-RZ Control Chart

In many industrial manufacturing processes, the quality of products depends on the relation between two main ingredients or characteristics. Often, this calls for monitoring the ratio of two normal random variables with statistical process control (SPC) techniques. A large number of studies related to designing control charts monitoring this ratio have been published. However, these studies are based purely on the assumption of independent observations. In practice, autocorrelation between observations can exist and should be modeled to protect against the false alarm rate inflation when imple…

One-sided Shewhart control charts for monitoring the ratio of two normal variables in Short Production Runs

Monitoring the ratio of two normal random variables plays an important role in several manufacturing environments. For short production runs, however, the control charts assumed infinite processes cannot function effectively to detect anomalies. In this paper, we tackle this problem by proposing two one-sided Shewhart-type charts to monitor the ratio of two normal random variables for an infinite horizon production. The statistical performance of the proposed charts is investigated using the truncated average run length as a performance measure in short production runs. In order to help the qu…

关于连续比例双侧休哈特控制图在参数估计下的性能研究

On The Performance of a Two-Sided Shewhart Chart for Continuous Proportions with Estimated Parameters

本文研究参数未知时基于Kumaraswamy分布的单值双侧控制图性能，通过蒙特卡洛模拟给出第一阶段样本量选择规则和控制限调整方法，并权衡受控与失控性能。

带结观测的符号秩控制图：深度学习模型的应用

Signed Rank Chart For Tied Observations: An Application of Deep Learning Models

针对非正态和舍入误差导致的结观测问题，提出基于Wilcoxon统计量的休哈特符号秩控制图，用缩放正态分布近似并借助深度学习估计尺度参数，以计算平均运行长度并评估制造过程偏移影响。

基于零膨胀负二项分布的指数加权移动平均控制图

Exponentially weighted moving average chart using zero-inflated negative binomial distribution

针对含大量零值的过度离散计数数据，本研究提出用ZINB模型适配数据，设计Shewhart和EWMA控制图开展监测，经模拟与真实数据验证，EWMA控制图性能更优。

参数估计情形下零膨胀过程控制图的无条件性能

The Unconditional Performance of Control Charts for Zero-Inflated Processes with Estimated Parameters

针对参数需估计的零膨胀泊松与二项过程，本文用 Monte Carlo 模拟评估 Shewhart 型控制图的无条件受控及失控性能，并给出实践使用指南。