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Related Concept Videos

Surveys02:16

Surveys

14.8K
Often, psychologists develop surveys as a means of gathering data. Surveys are lists of questions to be answered by research participants, and can be delivered as paper-and-pencil questionnaires, administered electronically, or conducted verbally. Generally, the survey itself can be completed in a short time, and the ease of administering a survey makes it easy to collect data from a large number of people.
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Convenience Sampling Method00:55

Convenience Sampling Method

9.0K
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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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...
12.1K
Systematic Sampling Method01:17

Systematic Sampling Method

10.4K
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...
10.4K
Cluster Sampling Method01:20

Cluster Sampling Method

12.0K
Appropriate sampling methods ensure 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 cluster sample, divide the population into clusters (groups) and then randomly select some of the clusters. All the members from these clusters are in the cluster sample. For example, if you randomly sample four departments from your...
12.0K
Data Collection by Survey01:07

Data Collection by Survey

6.5K
The systematic method of obtaining and analyzing accurate information of a population is called data collection. A survey is a standard method of data collection that involves collecting information from a target human population about their experience, opinion, or knowledge of a product, service, or process. The responses are recorded and interpreted. The most common survey examples are written questionnaires, face-to-face or telephonic conversations, focus groups, and electronic (e-mail or...
6.5K

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Related Experiment Video

Updated: Jul 24, 2025

Swabbing the Urban Environment - A Pipeline for Sampling and Detection of SARS-CoV-2 From Environmental Reservoirs
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Design and implementation of a web-based, respondent-driven sampling solution.

Catherine R McGowan1, Promise Ekoriko2,3, Mervat Alhaffar2

  • 1Department of Infectious Disease Epidemiology and International Health, Faculty of Epidemiology and Population Health, London School of Hygiene and Tropical Medicine, Keppel Street, London, WC1E 7HT, UK. Catherine.McGowan@lshtm.ac.uk.

BMC Medical Informatics and Decision Making
|July 5, 2023
PubMed
Summary
This summary is machine-generated.

We developed a web-based respondent-driven sampling (webRDS) solution for global surveys. Despite challenges with recruitment and lower-than-expected uptake, the system offers an efficient method for diverse population research.

Keywords:
Chain-referralHard-to-reach populationsMortality estimationRespondent-driven samplingYemenwebRDS

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Area of Science:

  • Public Health
  • Epidemiology
  • Survey Methodology

Background:

  • Respondent-driven sampling (RDS) is a chain-referral method for sampling and analysis.
  • Web-based respondent-driven sampling (webRDS) integrates internet recruitment with electronic surveys.
  • No commercial webRDS solution is currently available, necessitating custom development.

Purpose of the Study:

  • To design and develop a novel webRDS solution.
  • To support research estimating conflict-attributable mortality in Yemen.
  • To create a system for administering and managing RDS survey cascades.

Main Methods:

  • Developed a webRDS solution using the ODK survey platform and a bespoke RDS system.
  • The RDS system includes an API, participant client, and administrator interface.
  • Consulted with members of the Yemeni diaspora during development.

Main Results:

  • Technical challenges arose from WhatsApp policies, SMS constraints, and filtering.
  • Survey uptake was lower than anticipated due to factors like consumable links and survey design.
  • SMS/WhatsApp integration presented complexities and limitations in communication.

Conclusions:

  • The developed webRDS solution offers an efficient and flexible approach for surveying diverse global populations.
  • Despite lower uptake, the system demonstrates potential for future research applications.
  • Further refinement may address recruitment challenges and enhance participant engagement.