Through a combination of descriptive text and exercises, this study
presents a common framework for the planning and critical
evaluation of epidemiological studies. It describes the principal
sources of error in study design, their impact on the results, and
the research strategies used to prevent or control different kinds
of errors. These strategies are the building blocks used in the
design of studies with the overall objective of obtaining accurate
results with limited resources. They are illustrated throughout by
examples and exercises. The work aims to provide the reader with a
clear understanding of the research strategies used in experimental
and non-experimental studies.
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