Qualitative sampling
GRACIA GARDENS NAIROBI WORKSHOP-23 TO 27
SEPT, 2019
Vincent Jumbe, MPH, MA(Bioethics), PhD
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Qualitative Sampling Techniques in Social Research: A Workshop Summary, Assignments of Research Methodology
An overview of qualitative sampling techniques used in social research. The workshop covered various sampling methods, including haphazard, quota, purposive, snowball, extreme case, and theoretical sampling. Participants discussed the pros and cons of each method and their applications in different research contexts.
Typology: Assignments
2019/2020
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Qualitative sampling
GRACIA GARDENS NAIROBI WORKSHOP-23 TO 27
SEPT, 2019
Vincent Jumbe, MPH, MA(Bioethics), PhD
Objectives
» Discuss the various sampling techniques in
Qualitative studies
» Outline the pros and cons of each method
Who are they
Black/Blue/Green/Red
Thin/Bold
Smiling/Normal/Sad
^
Non-Probability Sampling
• Haphazard sampling
• Quota sampling
• Purposive sampling
• Snowball sampling
• Deviant case sampling
• Sequential sampling
• Theoretical sampling
HapHazard Sampling
• Haphazard sampling is a sampling method that does
not follow any systematic way of selecting participants.
• An example - standing on a busy corner during rush
hour and interviewing people who pass by.
• Gives little guarantee that your sample will be
representative of the entire population
Quota sample
^
Purposive Sampling
» Identification and selection of information-rich cases related to the
phenomenon of interest.
» Identifying and selecting individuals or groups of individuals that are
especially knowledgeable about or experienced with a phenomenon of
interest.
» Availability and willingness to participate, and the ability to
communicate experiences and opinions in an articulate, expressive, and
reflective manner.
Selection Approaches
extreme or deviant (outlier) cases for the purpose of learning from
an unusual manifestations of phenomena of interest
maximum variation the selection of cases with varying aspects for
the purpose of documenting unique or diverse variations that have
emerged in adapting to different conditions, and to identify important
common patterns that cut across variations
homogeneous cases - Selection for the purpose of reducing
variation, simplifying analysis, and facilitating group interviewing.
Snowball sample
^
Deviant case sampling
^
Theoretical sampling
• Based on (grounded) theory
– Theory develops from initial research
– Cases are selected that are expected to
further deepen the theory
- Eg. Theory developed from data collected during
day time next collect data at night
Probability Sampling
Population
(delinquents)
N
Target population
(thieves)
Sampling frame
(known as
“thieves” by
police)
Sample
n
^
Sampling ratio