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Related Concept Videos

Convenience Sampling Method00:55

Convenience Sampling Method

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Sampling is a technique to select a portion (or subset) of the larger population and study that portion (the sample) to gain information about the population. Data are the result of sampling from a population. The sampling method ensures that samples are drawn without bias and accurately represent the population.
Convenience sampling is a non-random method of sample selection; this method selects individuals that are easily accessible and may result in biased data. For example, a marketing...
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Systematic Sampling Method01:17

Systematic Sampling Method

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Sampling is a technique to select a portion (or subset) of the larger population and study that portion (the sample) to gain information about the population. Data are the result of sampling from a population. The sampling method ensures that samples are drawn without bias and accurately represent the population. Because measuring the entire population in a study is not practical, researchers use samples to represent the population of interest.
Systematic sampling is one of the simplest methods...
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Sampling Plans01:23

Sampling Plans

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Sampling is a crucial step in analytical chemistry, allowing researchers to collect representative data from a large population. Common sampling methods include random, judgmental, systematic, stratified, and cluster sampling.
Random sampling is a method where each member of the population has an equal chance of being selected for the sample. It involves selecting individuals randomly, often using random number generators or lottery-type methods. For example, when analyzing the properties of a...
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Random Sampling Method01:09

Random Sampling Method

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Sampling is a technique to select a portion (or subset) of the larger population and study that portion (the sample) to gain information about the population. Data are the result of sampling from a population. The sampling method ensures that samples are drawn without bias and accurately represent the population. Because measuring the entire population in a study is not practical, researchers use samples to represent the population of interest. Among the various sampling methods used by...
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Stratified Sampling Method01:16

Stratified Sampling Method

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Sampling is a technique to select a portion (or subset) of the larger population and study that portion (the sample) to gain information about the population. The sampling method ensures that samples are drawn without bias and accurately represent the population. Because measuring the entire population in a study is not practical, researchers use samples to represent the population of interest.
To choose a stratified sample, divide the population into groups called strata and then take a...
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Systematic Error: Methodological and Sampling Errors01:15

Systematic Error: Methodological and Sampling Errors

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In the case of systematic errors, the sources can be identified, and the errors can be subsequently minimized by addressing these sources. According to the source, systematic errors can be divided into sampling, instrumental, methodological, and personal errors.
Sampling errors originate from improper sampling methods or the wrong sample population. These errors can be minimized by refining the sampling strategy. Defective instruments or faulty calibrations are the sources of instrumental...
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Related Experiment Video

Updated: Jul 30, 2025

Using a Real-Time Locating System to Measure Walking Activity Associated with Wandering Behaviors Among Institutionalized Older Adults
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Sampling Methodology and Reliability of a Representative Walkability Audit.

Emily N Ussery1,2, John D Omura1,2, Prabasaj Paul2

  • 1Epidemic Intelligence Service, Centers for Disease Control and Prevention, Center for Surveillance, Epidemiology, and Laboratory Services, Atlanta, Georgia.

Journal of Transport & Health
|May 14, 2023
PubMed
Summary

A walkability audit in the US Virgin Islands (USVI) assessed pedestrian infrastructure. The study found it feasible to conduct reliable audits, providing data to improve community walkability and physical activity.

Keywords:
Microscale Audit of Pedestrian StreetscapesUS Virgin Islandsbuilt environmentphysical activitywalkability audit

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Area of Science:

  • Public Health
  • Urban Planning
  • Environmental Science

Background:

  • Physical inactivity is a significant public health issue in the US Virgin Islands (USVI).
  • Limited pedestrian infrastructure may contribute to low physical activity levels.
  • This study details methods for assessing environmental walkability in the USVI.

Purpose of the Study:

  • To describe the methodology for a walkability audit in the USVI.
  • To evaluate environmental features supporting physical activity.
  • To establish a foundation for improving community walkability.

Main Methods:

  • A modified Microscale Audit of Pedestrian Streetscapes tool was used by volunteer auditors in 2016.
  • A two-stage sampling strategy selected 46 estates and 1,550 street segments (99.2 km).
  • Inter-rater reliability was assessed using Cohen's kappa and percent agreement.

Main Results:

  • Audits covered 1,114 segments (94.6 km), weighted to represent 1,155.9 km of accessible public streets.
  • The audit tool demonstrated good to excellent reliability for most items (62.7%).
  • A reliable audit of environmental features is feasible across a large street sample in the USVI.

Conclusions:

  • The methods employed are replicable in other regions.
  • This approach enables comprehensive data collection for walkability improvement strategies.
  • Findings support evidence-based interventions to enhance physical activity environments.