A more realistic approach is to study samples or subsets of a population. It would, of course, be impossible to answer all such questions by collecting information (data) from all subjects in the populations of interest. In other circumstances in would be important to make comparisons among groups of subjects in order to determine whether certain behaviors (e.g., smoking, exercise, etc.) are associated with a greater risk of certain health outcomes. One can imagine that it might be of interest to characterize a given population (e.g., adults in Boston or all children in the United States) with respect to the proportion of subjects who are overweight or the proportion who have asthma, and it would also be important to estimate the magnitude of these problems over time or perhaps in different locations.
Lisa Sullivan, PhD, Professor of Biostatistics, Boston University School of Public Healthīiostatistics is the application of statistical principles to questions and problems in medicine, public health or biology.
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