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Part 4: Obtaining Study Subjects and Collection of Data

Chapter 11: Populations and Samples

Research Links

A Brief Introduction to Sampling
This web site contains definition, types, examples, and references about sample selection.
Probability Sampling
This web site contains definitions and examples about probability sampling types such as simple random, stratified random, systematic random, cluster random, and multistage.
Nonprobability Sampling
This web site contains definitions and examples about nonprobability sampling types such as convenience and purposive.
Research-Vulnerable Populations
This Robert Wood Johnson website offers current and archived abstracts and/or full text articles about research with vulnerable populations such as persons who have a low income, are homeless, have disabilities, are incarcerated, and so on.
The Ethics of Research on Vulnerable Populations
This web site of The Online Ethics Center for Engineering and Science at Case Western Reserve University presents a learning module about many facets of fair research with vulnerable populations.
Literacy and Health Outcomes: A cross-sectional study in 1002 adults with diabetes.
This BioMed Central Family Practice web site presents study results about the association between literacy, physiologic control, and diabetes complications in adults.
Longitudinal Studies of Aging
This National Center for Health Statistics web site describes a project that investigates older adults' health, functional status, living arrangements, and use of health services over time.
Cohort Studies
This State University of New York Downstate illustrates principles of cohort research studies.
Important Factors in Designing Statistical Power Analysis Studies
This University of Oregon web site defines power and discusses multiple questions and considerations when designing a statistical power analysis.
Accruing the Sample in Survey Research
This site presents the summary of a report focused on accruing subjects for survey research.
Samples and Sampling
This site presents examples of probability and nonprobability sampling.
Smoking Patterns Among Rural Elderly
This website provides a summary of a study that recruited a population-based, stratified random sample to examine the smoking patterns of rural elderly.
Evaluation of Nursing-Sensitive Outcomes Classification (NOC) Instruments with Chronically Ill Patients
This website provides a summary of a study that recruited a convenience sample of chronically ill veterans to evaluate instruments designed to measure knowledge of medication, home care readiness, and health promoting behavior.

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