BUREAU OF THE CENSUS STATISTICAL RESEARCH DIVISION Statistical Research Report Series No. 92114 Non-Gaussian Season Adjustment: X-12 ARIMA Versus Robust Structural Models Andrew G. Bruce & Simon R. Jurke Statistical Sciences, Inc. Seattle, WA 98109 Report Issued: 12/10/92 This series contains research reports, written by or in cooperation with, staff members of the Statistical Research Division, whose content may be of interest to the general statistical research community. The views reflected in these reports are not necessarily those of the Census Bureau nor do they necessarily represent Census Bureau statistical policy or practice. Inquiries may be addressed to the author(s) or the SRD Report Series Coordinator, Statistical Research Division, Bureau of the Census, Washington DC. 20233.