概率抽样（probability sampling），也称随机抽样（random sampling），是指遵循随机原则进行的抽样，总体中每个个体都有一定的机会被选入样本。从理论上讲，概率抽样是最科学的抽样方法，它能保证抽取出来的样本对总体的代表性。 概率抽样分为等概率抽样（equal ...

Survey sampling and estimation methods form the cornerstone of modern statistical inference, underpinning research across the social, medical, and natural sciences. At their heart, these methods ...

This paper presents preliminary results of an empirical study of probability sampling designs based on the study of seven attributes of collared rimsherds from six totally or almost totally excavated ...

The COVID-19 pandemic has infected over 38 million people around the world and is showing no signs of going away any time soon. Researchers worldwide are frantically working on developing an effective ...

The analysis in this report is based on a survey conducted August 7-14, 2013 among a sample of 1,052 adults, 18 years of age or older. The survey was conducted by the GfK Group using KnowledgePanel, ...

Adam Hayes, Ph.D., CFA, is a financial writer with 15+ years Wall Street experience as a derivatives trader. Besides his extensive derivative trading expertise, Adam is an expert in economics and ...

In a recently published news story, we learn about a young doctor, Jake Deutsch, and his personal experience with coronavirus disease 2019. Deutsch tested positive for Covid-19 and checked himself ...