Specific Types of Quantitative Research & Sampling in Quantitative Research.

Specific Types of Quantitative Research & Sampling in Quantitative Research.

Copyright © 2012 Wolters Kluwer Health | Lippincott Williams & Wilkins

Chapter 12

Sampling in Quantitative Research

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Copyright © 2017 Wolters Kluwer Health | Lippincott Williams & Wilkins

Question

Tell whether the following statement is true or false:

The aggregate of cases in which a researcher is interested is called a sample.

Copyright © 2017 Wolters Kluwer Health | Lippincott Williams & Wilkins

Answer

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.

Copyright © 2017 Wolters Kluwer Health | Lippincott Williams & Wilkins

Basic 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

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Eligibility Criteria

  • Establish population characteristics
  • Determine participation in study
  • Maximize construct validity
  • Inclusion
  • Exclusion

Copyright © 2017 Wolters Kluwer Health | Lippincott Williams & Wilkins

Question

Tell whether the following statement is true or false:

Researchers usually sample from the target population.

Copyright © 2017 Wolters Kluwer Health | Lippincott Williams & Wilkins

Answer

False

Researchers usually sample from the accessible population but should identify the target population to which they want to generalize their results.

Copyright © 2017 Wolters Kluwer Health | Lippincott Williams & Wilkins

Basic 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

Copyright © 2017 Wolters Kluwer Health | Lippincott Williams & Wilkins

Question

Tell whether the following statement is true or false:

Probability sampling involves random selection of elements.

Copyright © 2017 Wolters Kluwer Health | Lippincott Williams & Wilkins

Answer

True

Probability sampling involves random selection of elements.

Copyright © 2017 Wolters Kluwer Health | Lippincott Williams & Wilkins

Basic Sampling Concepts in Quantitative Studies (cont.)

Probability sampling

Involves random selection of elements

Nonprobability sampling

Does not involve selection of elements at random

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Nonprobability Sampling

  • Convenience sampling
  • Snowball sampling
  • Quota sampling
  • Consecutive sampling
  • Purposive sampling

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Probability Sampling

  • Simple random sampling
  • Stratified random sampling
  • Multistage sampling
  • Cluster sampling
  • Systematic sampling

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Copyright © 2017 Wolters Kluwer Health | Lippincott Williams & Wilkins

Power Analysis

  • Estimate sample size
  • Large samples preferred to small samples
 
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