Random sample — 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 independent observations from the same… … Wikipedia
Simple random sample — In statistics, a simple random sample is a subset of individuals (a sample) chosen from a larger set (a population). Each individual is chosen randomly and entirely by chance, such that each individual has the same probability of being chosen at… … Wikipedia
sample — imtis statusas T sritis biomedicinos mokslai apibrėžtis 1) iš ↑populiacijos tyrimui atrinktų individų grupė; 2) iš ↑generalinės aibės tyrimui atrinktų objektų poaibis. Imtis gali būti atsitiktinė arba neatsitiktinė ir reprezentatyvioji arba… … Lithuanian dictionary (lietuvių žodynas)
Cluster sampling — is a sampling technique used when natural groupings are evident in a statistical population. It is often used in marketing research. In this technique, the total population is divided into these groups (or clusters) and a sample of the groups is… … Wikipedia
Sample (statistics) — In statistics, a sample is a subset of a population. Typically, the population is very large, making a census or a complete enumeration of all the values in the population impractical or impossible. The sample represents a subset of manageable… … Wikipedia
cluster sample — a variation of a random sample in which the population is divided into groups on the basis of some shared characteristic (such as hospitals grouped by geographic region) and a random sample is drawn from each group … Medical dictionary
cluster sampling — A method of selecting a sample in which the population is divided into clusters (groups) from each of which a random sample is taken. This technique is often used in auditing. For example, groups of, say, invoices are chosen at random by the… … Accounting dictionary
cluster sampling — (Statistics) technique of sampling where the whole population is divided into groups and a random sample of these clusters are picked out … English contemporary dictionary
Sample size determination — is the act of choosing the number of observations to include in a statistical sample. The sample size is an important feature of any empirical study in which the goal is to make inferences about a population from a sample. In practice, the sample … Wikipedia
Cluster analysis — The result of a cluster analysis shown as the coloring of the squares into three clusters. Cluster analysis or clustering is the task of assigning a set of objects into groups (called clusters) so that the objects in the same cluster are more… … Wikipedia
