What Is an Observational Study? | Guide & Examples - Scribbr
网页2022年3月31日 — An observational study is used to answer a research question based purely on what the researcher observes. There is no interference or manipulation of the research subjects, and no control and treatment groups .
What is an Observational Study: Definition & Examples
网页An observational study uses sample data to find correlations in situations where the researchers do not control the treatment, or independent variable, that relates to the primary research question. The definition of an observational study hinges on the notion that the researchers only observe subjects and do not assign them to the control and ...
Observational study - Wikipedia
网页One common observational study is about the possible effect of a treatment on subjects, where the assignment of subjects into a treated group versus a control group is outside the control of the investigator. [1][2] This is in contrast with experiments, such as randomized controlled trials, where each subject is randomly assigned to a treated gr...
临床研究的设计类型 - 知乎 - 知乎专栏
网页研究方法. 根据研究者是希望对被试人群进行被动的观察或主动干预，临床研究的设计类型分为两大类，被动观察的称为观察性研究（Observational study），进行主动干预的称为临床试验（Clinical trial）。 在观察性研究中，如果…
Observational Study Designs: Synopsis for Selecting an …
网页2020年1月17日 — Observational design occupies the middle and lower parts of the hierarchy of evidence-based pyramid. The observational design is subdivided into descriptive, including cross-sectional, case report or case series, and correlational, and analytic which includes cross-section, case-control, and cohort studies.
What is Observational Study Design and Types - Elsevier
网页An observational study is when researchers are looking at the effect of some type of intervention, risk, a diagnostic test or treatment, without trying to manipulate who is, or who isn’t, exposed to it.
观察性研究 - 维基百科，自由的百科全书
网页观察性研究 （observational study）为 流行病学 及 统计学 中的一种研究方法，又称非实验性研究或对比研究。 该研究通过对研究对象在自然状态下根据特定的特征分组后进行观察、记录，并对结果进行描述和对比分析而得出结论。 与 实验 及 随机对照试验 等研究方法不同，此类研究方法的研究者没有（或未能）人为设置处理因素。 原因. 在研究中，可能因為一些原因使得研究者無法控制一些或所有獨立變數： 随机对照试验可能會違反 伦理学 標準。 …
Observational Studies: Cohort and Case-Control Studies
网页Cohort studies and case-control studies are two primary types of observational studies that aid in evaluating associations between diseases and exposures. In this review article, we describe these study designs, methodological issues, and provide examples from the plastic surgery literature.
Observational Studies: Uses and Limitations | SpringerLink
网页2019年5月11日 — Observational studies analyze subjects without any experimental intervention by the investigator.
Observational Study - SpringerLink
网页2020年10月20日 — An observational study explores the relationship between an identified putative cause and its effects when it is not possible to conduct a prospective interventional study. Description. Multiple study designs are available for, and essential to, empirical investigation of factors of interest in behavioral medicine and public health research.