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In the 1990s, the US EPA enacted the reformulated gasoline program in select areas of the U.S., which drastically reduced ambient TRAP in affected areas. This created an ideal quasi-experiment to study the effects of TRAP on childhood haematologic cancers. However, existing methods for quasi-experimental analyses can perform poorly when outcomes are rare and unstable, as with childhood cancer incidence. We develop Bayesian spatio-temporal matrix completion methods to conduct causal inference in quasi-experimental settings with rare outcomes. Selective information sharing across space and time enables stable estimation, and the Bayesian approach facilitates uncertainty quantification. We evaluate the methods through simulations and apply them to estimate the causal effects of TRAP on childhood leukaemia and lymphoma.<\/jats:p>","DOI":"10.1093\/jrsssa\/qnae109","type":"journal-article","created":{"date-parts":[[2024,10,23]],"date-time":"2024-10-23T23:25:10Z","timestamp":1729725910000},"page":"1184-1202","source":"Crossref","is-referenced-by-count":3,"title":["Spatio-temporal quasi-experimental methods for rare disease outcomes: the impact of reformulated gasoline on childhood haematologic cancer"],"prefix":"10.1093","volume":"188","author":[{"ORCID":"https:\/\/orcid.org\/0009-0005-1061-0800","authenticated-orcid":false,"given":"Sofia L","family":"Vega","sequence":"first","affiliation":[{"name":"Department of Biostatistics, Harvard T.H. 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