منابع مشابه
Sample Surveys
A census is a complete enumeration of the population: data are collected from every unit in the population. In a survey, a subset of the population, called a sample, is taken. Census are taken at regular but infrequent intervals, e.g. every 5 or 10 years. In between, surveys are used to update results. The selection and estimation procedures of official surveys are almost always based on previo...
متن کاملSample Surveys
1. What is a Survey? 2. Probability sampling 3. Common probability sampling designs 3.1. Simple Random Sampling 3.2. Stratified Sampling 3.3. Cluster Sampling 3.4. Unequal Probability Sampling 3.5. Systematic Sampling 3.6. Stratified Multistage Sampling 4. Survey estimates and standard errors 5. Nonsampling errors 6. Sampling rare populations 7. Issues in Survey Design Acknowledgments Glossary ...
متن کاملVLBI surveys
Systematic surveys of astronomical objects often lead to discoveries, but always provide invaluable information for statistical studies of well-defined samples. They also promote follow-up investigations of individual objects or classes. Surveys using a yet unexplored observing wavelength, a novel technique or a new instrument are of special importance. Significantly improved observing paramete...
متن کاملNegative Surveys
In this paper we propose a strategy for administering a survey that is mindful of sensitive data and individual privacy. The survey in question seeks to estimate the population proportions of a sensitive, polychotomous variable and does not depend on anonymity, cryptography, or in legal guarantees for its privacy preserving properties. Our technique, called Negative Surveys, presents interviewe...
متن کاملTruthful Surveys
We consider the problem of truthfully sampling opinions of a population for statistical analysis purposes, such as estimating the population distribution of opinions. To obtain accurate results, the surveyor must incentivize individuals to report unbiased opinions. We present a rewarding scheme to elicit opinions that are representative of the population. In contrast with the related literature...
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ژورنال
عنوان ژورنال: Australian Journal of Physiotherapy
سال: 2005
ISSN: 0004-9514
DOI: 10.1016/s0004-9514(05)70026-x