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This article studies estimation methods for the location parameter. We consider several robust location estimators as well as several estimation methods based on a phase I analysis, i.e., the use of a control chart to study a historical dataset retrospectively to identify disturbances. In addition, we propose a new type of phase I analysis. The estimation methods are evaluated in terms of their mean-squared errors and their e↵ect on the X control charts used for real-time process monitoringdoi:10.1080/00224065.2011.11917870 fatcat:7bnzmziosffkrn2nd22wjw6fqq