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In recent years, disasters by abnormal rainfall was reported by every corner of the earth, and it has come out the necessity of estimating these disasters objectively.The purpose of this reseach is to show how global analysis should be done by proposing new indexes of the abnormal rainfall event.Furthermore, as a part of realization of the proposal, this research defined these indexes using rain gauges distributed over every corner of the earth, and performed global analysis of abnormal rainfall with these indexes.