This is a primary, comprehensive textbook for people who are considering undertaking a piece of health-related research. It is an accessible companion with the aim of getting the reader to think broadly about all of the issues that need to be considered when embarking on a project. This is a pragmatic book, a step-by-step guide to research which mirrors the structure of a research project, taking you through the thought process for designing and conducting your study from formulating the right research question at idea inception, ascertaining what methodologies and analysis can answer what type of questions, right through to dissemination, all presented in an easy, digestible style. The book is full of case study illustrations and practical tips such as how to work out a research budget and obtaining funding for your project, discussion of what permissions need to obtained when conducting research with people, and how to involve public and patients. The authors are all experienced researchers and so this book is an accumulation of collective wisdom on common research challenges and issues.
Chapter 17: Sampling
- Be aware of the differences between nonprobability and probability sampling methods, and for what type of research each of these approaches is suitable
- Know the value of simple random sampling, from a sampling frame, being the basis of methods to obtain a representative sample
- Understand the use of strata to make a sample more representative, and the use of clusters and systematic sampling for ease of sampling
- Be aware of how sample size calculations are used to control the extent of random error
In quantitative research we are generally interested in drawing a valid conclusion about a whole ‘target population’ of people. Often the target population includes people spread out over a wide geographical area, such as ‘all the people with chronic ...