JSM 2004 - Toronto

Abstract #300892

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Activity Number: 213
Type: Topic Contributed
Date/Time: Tuesday, August 10, 2004 : 10:30 AM to 12:20 PM
Sponsor: SSC
Abstract - #300892
Title: The Redesigned Canadian Monthly Wholesale and Retail Trade Survey: A Post-mortem of the Implementation
Author(s): Julie Trepanier*+
Companies: Statistics Canada
Address: Tunney's Pasture, Ottawa, ON, K1A 0T6, Canada
Keywords: Retail Trade Survey ; Wholesale Trade Survey ; parallel run ; evaluation
Abstract:

The development of the new MWRTS took place between 2000 and 2003. The sampling design was revised to incorporate the North American Industry Classification System, to expand the survey coverage to nonemployer businesses, to take advantage of the Goods and Services Tax data and to incorporate innovative solutions to maintain the quality of the survey over time. Some other changes to the survey were the inclusion of a multiple regression imputation, the development of an outlier detection and treatment strategy to deal with influential units at estimation, and the addition of many monitoring tools at different stages of the survey. The first official release of estimates from the new MWRTS is for the May 2004 reference month. Prior to that, an extensive testing took place for a period of five months, when both the old and new surveys were in production. What were the major highlights during the testing? What were the main challenges when the new estimates were produced? How and why did they differ from the old survey estimates? What have we learned from this experience? This paper will provide answers to these questions while giving an overview of the old and new MWRTS.

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