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Sampling in quantitative research презентация
Содержание
- 1. Sampling in quantitative research
- 2. Question Tell whether the following statement is
- 3. Answer False The aggregate of cases
- 4. Basic Sampling Concepts in Quantitative Studies Population:
- 5. Eligibility Criteria Establish population characteristics Determine participation in study Maximize construct validity Inclusion Exclusion
- 6. Question Tell whether the following statement is
- 7. Answer False Researchers usually sample from
- 8. Basic Sampling Concepts in Quantitative Studies Representative
- 9. Question Tell whether the following statement is
- 10. Answer True Probability sampling involves random selection of elements.
- 11. Basic Sampling Concepts in Quantitative Studies (cont.)
- 12. Nonprobability Sampling Convenience sampling Snowball sampling
- 13. Probability Sampling Simple random sampling Stratified random sampling Multistage sampling Cluster sampling Systematic sampling
- 14. Power Analysis Estimate sample size Large samples preferred to small samples
Слайд 2Question
Tell whether the following statement is true or false:
The aggregate of
cases in which a researcher is interested is called a sample.
Слайд 3Answer
False
The aggregate of cases in which a researcher is interested is
called a population. A sample is selection of a portion of the population to represent the entire population.
Слайд 4Basic Sampling Concepts in Quantitative Studies
Population: the aggregate of cases in
which a researcher is interested
Sampling: selection of a portion of the population (a sample) to represent the entire population
Element: basic population unit about which information is collected
Sampling: selection of a portion of the population (a sample) to represent the entire population
Element: basic population unit about which information is collected
Слайд 5Eligibility Criteria
Establish population characteristics
Determine participation in study
Maximize construct validity
Inclusion
Exclusion
Слайд 6Question
Tell whether the following statement is true or false:
Researchers usually sample
from the target population.
Слайд 7Answer
False
Researchers usually sample from the accessible population but should identify the
target population to which they want to generalize their results.
Слайд 8Basic Sampling Concepts in Quantitative Studies
Representative sample
A sample whose key characteristics
closely approximate those of the population
Sampling bias
The systematic over- or underrepresentation of segments of the population on key variables
Sampling bias
The systematic over- or underrepresentation of segments of the population on key variables
Слайд 9Question
Tell whether the following statement is true or false:
Probability sampling involves
random selection of elements.
Слайд 11Basic Sampling Concepts in Quantitative Studies (cont.)
Probability sampling
Involves random selection of
elements
Nonprobability sampling
Does not involve selection of elements at random
Nonprobability sampling
Does not involve selection of elements at random
Слайд 12Nonprobability Sampling
Convenience sampling
Snowball sampling
Quota sampling
Consecutive sampling
Purposive sampling
Слайд 13Probability Sampling
Simple random sampling
Stratified random sampling
Multistage sampling
Cluster sampling
Systematic sampling
