Before-after-control-impact (BACI) designs
{"Image DocumentName": "Before-after-control-impact (BACI) designs", "Image ImageDescription": "One of the most plausible alternative explanations of a change is that the system changed \u2018on its own\u2019. That is, the observed change (from the before-event samples to the after-event samples) would have happened even in the absence of the known impact. One simple impact-assessment design evaluates this alternative by estimating the change at a control site presumed to be unaffected by the known event. Data are collected at four combinations of sites and times: affected and unaffected sites, each sampled before the impact and after the impact.", "Image XResolution": "37", "Image YResolution": "37", "Image ResolutionUnit": "Pixels/Centimeter", "Image Software": "SlidePlayer", "Image YCbCrPositioning": "Centered"}