M2 Flashcards
all items or individuals of interest.
population
A finite subset of statistical individuals obtained from the population.
sample
select a portion from the population
sampling
- Complete enumerations are not possible when the population is infinite.
- Results are needed in a short amount of time.
- The survey area is wide.
- Limited resources
- An item or unit is destroyed during an investigation.
Reason for selecting a sample
- Define Target Population
- Select sampling frame.
- Define if probability or non-probability.
- Procedure for selecting sampling.
- Determine sample size.
- Selection of actual sample
- Fieldwork
Stages in Sampling Collection
- Simple Random
- Systematic
- Stratified Random
- Cluster
Probability of Sampling Techniques
TRUE OR FALSE: All types of Probability Sampling Techniques can
be multi-Stage
true
- Quota
- Snowball
- Self-Selection
- Convenience
- Purposive
Non-Probability Sampling Technique
- Extreme Case
- Heterogenous
- Homogenous
- Critical Case
- Typical Case
Types of Purposive Sampling
The researcher chooses a sample that is readily available in some nonrandom way.
Non Prob - Convenience sampling
The respondent decides whether or not to participate, typically in one request without the chance for follow up.
Non prob - Self selection sampling
It asks respondents to recommend other respondents who might subsequently be invited to take the survey.
non prob - snowball sampling
The interview or study designer chooses sampled units who, by their judgment, will meet the specific purpose of the survey.
non prob - Purposive Sampling
representative of views on an issue but “to look at it from all angles”
Maximum Variance Sampling
(Heterogeneous Sampling)
deeply explore the views of a group of respondents with the same characteristics.
Homogenous Sampling
is interested in an in-depth assessment of the typical viewpoint
Typical Case Sampling
interested in understanding unusual cases such as successes or failures
Extreme Case Sampling
Studying those cases that have the most to offer in terms of understanding the population.
Critical Case Sampling
Surveying experts on a particular topic, with their expertise left to the judgment of the interviewer or study designer.
Expert Sampling
Surveying every single member of a qualifying subgroup
Total Population Sampling
the population of interest is represented almost exactly by the percentage of each cell (major demographic group) in the final survey results. “Strata may be joint or interlocking” – so you might have quotas of younger women, older women, younger men, and older men. Sometimes known as “hard quotas”.
Proportional Quota Sampling