**THE OCCUPATIONAL HEALTH CARE SURVEY (OHC)**

The sampling design of the OHC Survey is an example of stratified cluster sampling in which both one-stage and two-stage sampling are used. Thus, the OHC Survey sampling design is slightly more complex than the MFH Survey. Moreover, in the OHC Survey sampling design a large number (250) of sample clusters are available, and the design produces noticeable clustering effects for several response variables. Therefore, this sampling design is very suitable for examining the effects of clustering in the analysis of complex surveys. The OHC Survey will be used for further examples given in Chapters 7 and 8. See pages 166-171 and 180 in Lehtonen, R. & Pahkinen, E. (2004)