The frequencies given were used to generate mean values for the Easter regressor in the most recent release of X-13ARIMA-SEATS.
Papers cited on this site include:
Findley, D. F. (2009), Stock Series Holiday Regressors Generated By Flow Series Holiday Regressors
Center for Statistical Research and Methodology Research Report Series (Statistics No. 2009-04). U.S. Census Bureau [Online].
Available: https://www.census.gov/srd/papers/pdf/rrs2009-04.pdf [2009, April 30].
Monsell, B. C. (2009), Update on the Development of X-13ARIMA-SEATS,
JSM Proceedings, Business and Economic Statistics Section. Alexandria, VA: American Statistical Association.
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