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Updated: Jan 15, 2026

Breakfast Habits among Schoolchildren in the City of Uruguaiana, Brazil
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Published on: July 29, 2020

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随机和便利样本之间的比较在多中心调查中,以评估医学学生的生活质量

Paulo Sergio Panse Silveira1, Patricia Zen Tempski2, Fernanda Brenneisen Mayer2,3

  • 1Departamento de Patologia, Faculdade de Medicina, Universidade de Sao Paulo, Sao Paulo, Brazil.

PloS one
|October 7, 2025
PubMed
概括

招募医学学生进行健康研究是具有挑战性的. 这项研究发现,大量努力招募随机样本的结果与志愿者样本的结果相似,这表明更简单的招聘策略可能足够.

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Surveys02:16

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Convenience 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.
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Group Design02:01

Group Design

The most basic experimental design involves two groups: the experimental group and the control group. The two groups are designed to be the same except for one difference— experimental manipulation. The experimental group gets the experimental manipulation—that is, the treatment or variable being tested—and the control group does not. Since experimental manipulation is the only difference between the experimental and control groups, we can be sure that any differences between...
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In cross-sectional research, a researcher compares multiple segments of the population at the same time. If they were interested in people's dietary habits, the researcher might directly compare different groups of people by age. Instead of following a group of people for 20 years to see how their dietary habits changed from decade to decade, the researcher would study a group of 20-year-old individuals and compare them to a group of 30-year-old individuals and a group of 40-year-old...
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