A TRAINING COURSE
IN SAMPLING CONCEPTS
FOR AGRICULTURAL SURVEYS
Harold F. Huddleston
Statistical Reporting Service
(Revised November 19RO)
This set of training materials on conducting agricultural
is the result of experience in training and consulting with officials of foreign
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
The approach used in presenting
is that of a discussion of the concepts followed by a relatively simple illustra-
When possible, a real example is presented in wl]ich the participants
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 sur-
veys and who must be familiar with the essential concepts of sampling.
believed that the demonstration
of the interrelationships
between different survey
activities and alternative uses of information
(that is, resources) should also he
One of the main objectives in preparing this module was to provide a fairlv
complete set of materials for use in foreign training.
A short training course
consisting of 40 to 50 hours along with informal discussions over a period of two
weeks is believed a feasible undertaking.
The training materials are divided into
four subsections as follows:
(1) an overview of sampl ing,
(3) random selection techniques, and (4) examples of agricultural
surveys including the preparation of estimates.
It is necessary to emphasize that this training module is not intended to be
manual, hut rather an aid to he used