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Systematic Sampling Method

Systematic Sampling Method

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...

Sampling Plans

Sampling Plans

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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Related Experiment Video

Updated: Jun 22, 2026

Comet Assay as an Indirect Measure of Systemic Oxidative Stress

Comet Assay as an Indirect Measure of Systemic Oxidative Stress

Published on: May 22, 2015

Systematic random sampling of the comet assay.

Darragh G McArt¹, Gillian R Wasson, George McKerr

¹Biomedical Sciences Research Institute, University of Ulster, Coleraine, County Londonderry, Northern Ireland, UK.

|May 30, 2009

Summary

This summary is machine-generated.

This study introduces a systematic random sampling (SRS) method for comet assay image acquisition. SRS provides a more objective, unbiased, and reproducible way to quantify DNA damage compared to traditional approaches.

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Last Updated: Jun 22, 2026

Comet Assay as an Indirect Measure of Systemic Oxidative Stress

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Published on: May 22, 2015

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Published on: October 18, 2014

Area of Science:

Molecular Biology
Genetics
Biotechnology

Background:

The comet assay is a standard technique for quantifying DNA damage and repair at the cellular level.
Current comet assay image acquisition relies on methods that may lack objectivity and randomness.
Accurate DNA damage assessment is crucial for understanding cellular responses to genotoxic agents.

Purpose of the Study:

To evaluate the 'randomness' of traditional comet assay acquisition phases.
To propose and validate an alternative method for objective and unbiased comet selection.
To enhance the precision and reproducibility of DNA damage estimation.

Main Methods:

Adoption of a survey sampling approach, specifically systematic random sampling (SRS), from stereology.
Utilizing an unbiased sampling frame and microscope verniers for comet selection.
Comparison of SRS technique with traditional methods through multiple-user pooled variation and single-user repetition experiments.

Main Results:

The SRS technique demonstrated lower variability in multiple-user experiments compared to traditional methods.
Single-user experiments showed that SRS, despite individual variances, did not detrimentally affect overall averages.
SRS offers a more accurate reflection of DNA damage per slide and improved user reproducibility.

Conclusions:

Systematic random sampling (SRS) provides an impartial and reproducible method for comet assay analysis.
The SRS approach enhances the precision of DNA damage estimates.
This method is suitable for both manual and automated comet analysis, improving overall reliability.