A Training Course in Sampling Concepts for Agricultural Surveys

Excerpts from the Preface: This set of training materials on conducting agricultural statistical programs is the result of experience in training and consulting with officials of foreign governments, and reflects the needs encountered by personnel who have engaged in similar domestic assignments. The materials describe the sampling considerations commonly required in collecting current agricultural data and providing evaluations of agricultural census procedures. The approach used in presenting these materials is that of a discussion of the concepts followed by a relatively simple illustration. When possible, a real example is presented in which the participants complete a given unit of work. This approach is designed to satisfy the needs of Survey personnel and administrators who will have responsibilities for carrying out surveys and who must be familiar with the essential concepts of sampling. It is believed that the demonstration of the interrelationships between different survey activities and alternative uses of information (that is, resources) should also be beneficial. The training materials are divided into four subsections as follows: (1) an overview of sampling, (2) construction of sampling frames, (3) random selection techniques, and (4) examples of agricultural surveys including the preparation of estimates.