Random sample - Wikipedia, the free encyclopedia
A sample is a subject chosen from a population for investigation. A random sample is one chosen by a method involving an unpredictable component. Random sampling can also refer to taking a number of...
en.wikipedia.org/wiki/Random_sample
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Stratified sampling - Wikipedia, the free encyclopedia
In statistics, stratified sampling is a method of sampling from a population. When sub-populations vary considerably, it is advantageous to sample each subpopulation (stratum) independently. Strati...
en.wikipedia.org/wiki/Stratified_sampling
Sampling (statistics) - Wikipedia, the free encyclopedia
Sampling is that part of statistical practice concerned with the selection of individual observations intended to yield some knowledge about a population of concern, especially for the purposes of st...
en.wikipedia.org/wiki/Sampling_(statistics)
This is part of HyperStat Online, a free online statistics book. ... In random sampling, each item or element of the population has an equal chance of being chosen at each draw. A sample is random if the method for obtaining the sample meets the criterion of randomness (each element having an equal chance at each draw).
davidmlane.com/hyperstat/A35563.html
random sampling: Definition and Pronunciation ... random number ... random sampling (Thesaurus)
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Simple Random Sampling: A simple random sample (SRS) of size n is produced by a scheme which ensures that each subgroup of the population of size n has an equal probability of being chosen as the sample. ... Stratified Random Sampling: Divide the population into "strata". There can be any number of these. Then choose a...
www.ma.utexas.edu/users/parker/sampling/srs.htm www.ma.utexas.edu/users/parker/sampling/srs.htm
Simple Random Sampling ... Random sampling is a sampling technique where we select a group of subjects (a sample) for study from a larger group (a population). Each individual is chosen entirely by chance and each member of the population has a known, but possibly non-equal, chance of being included in the sample.
www.stats.gla.ac.uk/steps/glossary/sampling.html www.stats.gla.ac.uk/steps/glossary/sampling.html
Random sampling is the purest form of probability sampling. Each member of the population has an equal and known chance of being selected. When there are very large populations, it is often difficult or impossible to identify every member of the population, so the pool of available subjects becomes biased.
www.statpac.com/surveys/sampling.htm www.statpac.com/surveys/sampling.htm
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