Part 1: Basic Principles Chapter 2: Sampling Methods

1987 S. Wayne Martin, Alan H. Meek, Preben Willeberg Veterinary Epidemiology: Principles and Methods Part 1: Basic Principles Chapter 2: Sampling Methods Orlglnally publlshed 1987 by Iowa State University Press I Ames Rights for this work have been reverted to the authors by the original publisher. The authors have chosen to license this work as follows: License information: 1. The collection is covered by the following Creative Commons License: lfc'@@~ ~"*11 1! Attrlbutlon-NonCommerclal-NoDerlvs lnternatlonal Hcense You are free to copy, distribute, and display this work under the following conditions: Attribution: You must attribute the work in the manner specified by the author or (j) licensor (but not in any way that suggests that they endorse you or your use of the work.)

24 I Basic Principles lected. If the objectives are straightforward and few in number, this aspect of planning is easy. At this stage of planning, explicit definitions of the outcome must be considered. That is, in a study to estimate the frequency of metritis in dairy cows, the outcome {metritis), must be dearly defined.

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