Canadian Addiction Survey (CAS)

P R E V A L E N C E. O F. U S E. A N D. R E L AT E D. H A R M S D E TA I L E D. R E P O R T 6 C H A P T E R. 1. –. I N T R O D U C T I O N C A N A D I A N. A D D I C T I O N. S U R V E Y Survey Background and Objectives Objectives Timely and relevant data on alcohol and other drug The key objectives of the CAS are as follows: use are necessary prerequisites for effective health and social policy a [...] Health Canada’s participation in the As was the case with the release of the 1989 NADS and CAS is an important initiative within the renewed the 1994 CADS, results from the Canadian Addiction Canada’s Drug Strategy, announced by the Government Survey will be presented through a forthcoming series of of Canada in May, 2003. [...] University of Toronto In the first stage, households were sampled at random based on random dialling, and in the second stage, one The views expressed in this chapter are those of the authors and do not member of the household was selected at random from all necessarily reflect those of the funders. [...] For example, the of the variance of an estimate derived from the particu- overall response rate for the 2002 Behavioral Risk Factor lar sampling design over the variance of the same esti- Surveillance System, one of the U. S. government’s key mate of an SRS of the same size. [...] P R E V A L E N C E. O F. U S E. A N D. R E L AT E D. H A R M S D E TA I L E D. R E P O R T 12 C H A P T E R. 2. –. S U R V E Y. D E S I G N. A N D. M E T H O D O L O G Y C A N A D I A N. A D D I C T I O N. S U R V E Y In the CAS design, the design effects are primarily influ- reflect errors due to the fact that we are surveying only a enced by the two-stage selection and the disproportion- sample