Goedhart, RobWoodall, William H.2021-07-302021-07-302021-04-140022-4065http://hdl.handle.net/10919/104461We propose a method for monitoring proportions when the in-control proportion and the sample sizes vary over time. Our approach is able to overcome some of the performance issues of other commonly used methods, as we demonstrate in this paper using analytical and numerical methods. The derivations and results are shown mainly for monitoring proportions, but we show how the method can be extended to the monitoring of count data.application/pdfenCreative Commons Attribution-NonCommercial-NoDerivs 4.0 InternationalAttribute control chartcontrol chartsLaney methodp-chartstatistical process monitoringArticle - Refereedhttps://doi.org/10.1080/00224065.2021.19038232575-6230