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  Replication is an important tool to promote high quality research and ensure policy makers can rely on studies in making guidelines or funding programs. By ensuring influential studies are ****ble we provide assurance that the policies based on these studies are well-founded and the conclusions and recommendations are robust-to different estimation models or different choices. In this paper, we argue that ****tion is not only useful but necessary to ensure that an author's choice in how to analyse data is not the only factor that determines whether an