On increasing the sensitivity of mixed EWMA–CUSUM control charts for location parameter

Control chart is an important statistical technique that is used to monitor the quality of a process. Shewhart control charts are used to detect larger disturbances in the process parameters, whereas cumulative sum (CUSUM) and exponential weighted moving average (EWMA) are meant for smaller and moderate changes. In this study, we enhanced mixed EWMA–CUSUM control charts with varying fast initial response (FIR) features and also with a runs rule of two out of three successive points that fall above the upper control limit. We investigate their run-length properties. The proposed control charting schemes are compared with the existing counterparts including classical CUSUM, classical EWMA, FIR CUSUM, FIR EWMA, mixed EWMA–CUSUM, 2/3 modified EWMA, and 2/3 CUSUM control charting schemes. A case study is presented for practical considerations using a real data set.     

Mixed multivariate EWMA-CUSUM control charts for an improved process monitoring

Multivariate exponential weighted moving average and cumulative sum charts are the most common memory type multivariate control charts. They make use of the present and past information to detect small shifts in the process parameter(s). In this article, we propose two new multivariate control charts using a mixed version of their design setups. The plotting statistics of the proposed charts are based on the cumulative sum of the multivariate exponentially weighted moving averages. The performances of these schemes are evaluated in terms of average run length. The proposals are compared with their existing counterparts, including HotellingT², MCUSUM, MEWMA, and MC1 charts. An application example is also presented for practical considerations using a real dataset.     

Role of Regional Consultative Processes in the lead up to the Negotiations of Global Compact on Migration: The Case of Africa

Regional consultative process was part of the preparations for the negotiations of the Global Compact on Safe, Orderly and Regular Migration (GCM). In Africa, the process was managed by the AU, UNECA and IOM and produced the Continental Report that fed into the global report of the UN Secretary General and the Common African Position (CAP) to the GCM. They were endorsed at the highest political level and guided the African states during the compact's negotiations. The article examines the regional consultations and development of these two documents, and highlights their history and normative contents that reflected on the performance of Africa during the negotiations and contributions to the outcome of the GCM. The African member states negotiated as a group, they spoke with one voice and made constructive alliances. Through process‐tracing, the article determines that Africa impacted and made significant contributions to the outcome of the GCM.