Contents

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Introduction

1 Reasons for sampling

2 Principles of sampling

3 Types of sampling

3.1 Probability (random) sampling

 Simple random sampling

 Systematic random sampling

 Stratified random sampling

 Multi-stage sampling

 Cluster sampling

 Multi-phase sampling

 Area sampling

Spatial sampling

3.2 Non-probability sampling

 Accidental sampling

 Purposive sampling

 Quota sampling

 Snowball sampling

 Theoretical sampling

4 Sampling procedures in qualitative research

5 Internet sampling

6 Sample size

6.1 Non-statistical estimations

6.2 Statistical computations

6.3 Estimating sample size through tables

Main points

Where to from here?

Further reading