This is the first of a series of articles that will describe the different types of study design; considerations when choosing a study design; and the advantages and disadvantages of each type of ...

Consider the example in the section "Stratified Sampling". The study population is a junior high school with a total of 4,000 students in grades 7, 8, and 9. Researchers want to know how much these ...

Environmental Health Perspectives, Vol. 102, Supplement 8: Biostatistics in the Study of Human Cancer (Nov., 1994), pp. 47-51 (5 pages) A stratified version of nested case-control sampling which we ...

Pew Research Center designed this study to assess the current state of online survey sampling methods – both probability-based and opt-in – and determine their accuracy on general population estimates ...

Owners continue to award more consruction projects under design-build contracts, a new study by the Design-Build Institute of America and consultant FMI concludes. According to the study, if ...