Distribution-free (nonparametric) control charts provide a robust alternative to a data analyst when there is lack of knowledge about the underlying distribution. A two-sided nonparametric Phase II exponentially weighted moving average (EWMA) control chart, based on the exceedance statistics (EWMA-EX), is proposed for detecting a shift in the location parameter of a continuous distribution. The...

In the manufacture of metal fasteners in a progressive die operation, and other industrial situations, important quality dimensions cannot be measured on a continuous scale, and parts are classified into groups using a step gauge. This article proposes a version of exponentially weighted moving average (EWMA) control charts applicable to monitoring the grouped data for process shifts. The run l...

in this paper, first the available single charting methods, which have been proposed to detect simultaneous shifts in a single process mean and variance, are reviewed. then, by designing proper simulation studies these methods are evaluated in terms of in-control and out-ofcontrol average run length criteria (arl). the results of these simulation experiments show that the ewma and ewms methods ...

پژوهش حاضر به بررسی این مسأله می‌پردازد که چگونه نوعِ متد آموزشی می‌تواند بر میزان اضطراب زبانی دانشجویان زبان‌های خارجی تأثیر بگذارد. یک گروه 40 نفره از دختر و پسر در سطح پیش‌دانشگاهی به‌عنوان جامعه آماری انتخاب شدند. آموزش زبان فرانسه دو هفته‌ی اول، طریق گرامر-ترجمه انجام شد. پایان هفته تست تعیین مقیاس کلاس خارجی: FLCAS، بعمل آمد. دوم نوع رویکرد کنشی تغییر یافت. پس مجدداً فراگیران نتایج حاصله ن...

When using control charts to monitor manufacturing processes, Shewhart control chart is known to be useful for detecting transient shifts, while the EWMA and CUSUM charts are useful for detecting persistent shifts. The efficiency of EWMA chart in monitoring location parameter can be improved by using an auxiliary variable that is closely related to the variable of interest. In this paper, an EW...

1. Unlike X -R and Individuals charts (without the Western Electric Handbook rules which aim to increase sensitivity), all of the data collected over time may be used to determine the control status of a process. 2. The EWMA is often superior to the CUSUM charting technique for detecting "larger" shifts. 3. EWMA schemes may be applied for monitoring standard deviations in addition to the proces...