More information about Easter is also available on this website, including:
The frequencies given were used to generate mean values for the Easter regressor in the most recent release of X-12-ARIMA.
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: http://www.census.gov/srd/papers/pdf/rrs2009-04.pdf [2009, April 30].
Griswold, R. E. and Griswold, M. T. (1996) The Icon Programming Language, Third Edition Peer-to-Peer Communications [Online]. Available: http://www.cs.arizona.edu/icon/lb3.htm [2009, July 24].
Monsell, B. C. (2009), Update on the Development of X-13ARIMA-SEATS, JSM Proceedings, Business and Economic Statistics Section. Alexandria, VA: American Statistical Association. Available: http://www.census.gov/ts/papers/jsm09bcm.pdf
U.S. Census Bureau (2009). X-12-ARIMA Reference Manual, Version 0.3 U.S. Census Bureau [Online]. Available: http://www.census.gov/ts/x12a/v03/x12adocV03.pdf [2009, December 18].
Zhang, X., McLaren, C. H., and Leung, C. C. S. (2003), An Easter proximity effect: Modelling and adjustment, Australian and New Zealand Journal of Statistics, 43, 269�280.