HLTB15H3 Lecture Notes - Lecture 7: Clinical Trial

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1 Mar 2011
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Lecture 7 โ€“ Undertaking Research: Sampling Methods
The Concept of Sampling
๎€Selecting a few from a bigger group
๎€Advantages: saves financial and human resources
๎€Disadvantages: estimation or prediction โ€“ possibility of error!
Sampling in Qualitative Research
๎€Saturation point โ€“ that is, keep going as long as one keeps discovering new
information
๎€Keep in mind โ€“ saturation point is a subjective judgement
Sampling Terminology
๎€Population / study sample (N)
๎€Sample
๎€Sample size (n)
๎€Sampling design / strategy
๎€Sampling unit / sampling element
๎€Sampling frame
๎€Sample statistics
๎€Population parameters or population mean
Example:
Objective: to examine the incidence of childhood obesity in school-aged children
in Canada
Population / study sample (N) โ€“ all children between the age of 5 and 11 years
Sample โ€“ x number of children selected from the study sample
Sample size โ€“ n = 2000
Sampling design / strategy โ€“ random, stratified.....
Sampling unit / sampling element โ€“ if a multi-stage sample, then could be schools, grades
selected, and individuals
Sampling frame โ€“ a list of schools, grades, students
Sample statistics โ€“ data related to who is obese or not
Population parameters or population mean โ€“ can only be obtained if all children aged 5 -11
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Document Summary

selecting a few from a bigger group. disadvantages: estimation or prediction possibility of error! saturation point that is, keep going as long as one keeps discovering new information. keep in mind saturation point is a subjective judgement. Objective: to examine the incidence of childhood obesity in school-aged children in canada. Population / study sample (n) all children between the age of 5 and 11 years. Sample x number of children selected from the study sample. Sampling unit / sampling element if a multi-stage sample, then could be schools, grades selected, and individuals. Sampling frame a list of schools, grades, students. Sample statistics data related to who is obese or not. Population parameters or population mean can only be obtained if all children aged 5 -11 www. notesolution. com are sampled. C and d 24 (-2. 5, -1. 5, 0, 1. 5, 2. 5) Select sample of 2 individuals to estimate average age. Sampling error difference between sample statistics & population mean.

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