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Research Methods Lecture V Sampling

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Jean-Michel Sotiron

on 2 October 2015

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Transcript of Research Methods Lecture V Sampling

Sampling
Research Methods Lecture V
What is sampling in social research?
A sample is some part of a larger body specially selected to represent the whole body.
Two General Categories of Sampling
Random/Probability Sampling
Non random/Non probability Sampling
Key Terms
Types of Random Sampling
SRS
Systematic
Stratified
Cluster
Combo = Multi-stage cluster sampling

SRS or Simple Random Sampling
Systematic
Select every nth unit with a random start
Stratified
Cluster or Multi-Stage
(combos)
Types of Non-Random Sampling
Haphazard, Accidental, or Convenience
Quota
Purposive or Judgemental
Snowball
Deviant Case
Sequential
Theoretical
Haphazard, Accidental, or Convenience
Quota
Purposeful or Judgemental
Snowball
Network to build sample
Unusual types
Deviant
Sequential
Theoretical
Review
Two (2) Characteristics
More accurate results when variation greater within than between
Deviant Sampling
Sequential Sampling
More clusters = better
Stop when marginal utility significantly drops
3 situations
-Random vs. non-random
-Depth and breadth
RANDOM
-SRS
-Systematic
-Stratified
-Cluster
-Combo = Multi-stage cluster sampling
NON-RANDOM
Haphazard, Accidental, or Convenience
Quota
Purposive or Judgemental
Snowball
Deviant Case
Sequential
Theoretical
Theoretical Sampling
Random/Probability Sampling
Non random/
Non probability Sampling

Random/Probability Sampling
Non random/Non probability Sampling
Probability & representativeness (breadth not depth)
GOALS
Relevance, specificity & plausibility (depth not breadth)
Dean Potter

DEGREE OF GENERALIZABILITY
High
Low

Random/Probability Sampling
Non random/
Non probability Sampling
SELECTION PROCESS
Random/
Probability Sampling
Non random/
Non probability Sampling
Preplanned, systematic and standardized procedures
Usually ad hoc, decided along the way and according to very specific qualitative goals
SPECIFIC TYPES
TODAY
Roll call
Sampling
Random
Non-Random
Exercise
Chapter 3 (Will be on test)
Sampling is the process by which this part is chosen.
Population
Target population
Sampling frame
Sampling bias
Generalizability
GOALS
DEGREE OF GENERALIZABILITY
SELECTION PROCESS
SPECIFIC TYPES
Alexandre Dumas, fils
Used in combination with other methods
Distinguish by strata
Otherwise known as quota
50% male/50% female
77% Christian/1.1% Jewish/
2% Muslim, 1% Buddhists/
1% Hindu/0.9% Sikh/17% other
Ex: Study on religious headgear
-Unique & Informative
-Understand types
-Hidden
Holla
Holla
Holla!
Being blind
Example:
Full transcript