sample selection

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• sample selection bias — Non random selection is both a source of bias in empirical research and a fundamental aspect of many social processes. When observations in social research are selected so that they are not independent of the outcome variables in a study, sample… …   Dictionary of sociology

• Sample Selection Bias — A type of bias caused by choosing non random data for statistical analysis. The bias exists due to a flaw in the sample selection process, where a subset of the data is systematically excluded due to a particular attribute. The exclusion of the… …   Investment dictionary

• Selection bias — is a statistical bias in which there is an error in choosing the individuals or groups to take part in a scientific study.[1] It is sometimes referred to as the selection effect. The term selection bias most often refers to the distortion of a… …   Wikipedia

• selection effects — See sample selection bias …   Dictionary of sociology

• Selection cutting — is the silvicultural practice of harvesting a proportion of the trees in a stand. Selection cutting is the practice of removing mature timber or thinning to improve the timber stand. This system may be used to manage even or uneven aged stands.… …   Wikipedia

• sample — I noun archetype, case in point, cross section, documentum, ensample, example, exemplar, exemplification, exemplum, guide, illustration, instance, model, original, paradigm, prototype, representation, representative, representative selection,… …   Law dictionary

• sample preparation — ▪ chemistry Introduction  in analytical chemistry (chemistry), the processes in which a representative piece of material is extracted from a larger amount and readied for analysis. Sampling and sample preparation have a unique meaning and special …   Universalium

• Sample preparation (mass spectrometry) — The sample preparation for mass spectrometry is used for the optimisation of a sample for the analysis in a mass spectrometer (MS).These have depending on their ion source different requirements for volume, concentration, and composition of the… …   Wikipedia

• sample — [[t]sɑ͟ːmp(ə)l, sæ̱m [/t]] ♦♦♦ samples, sampling, sampled 1) N COUNT A sample of a substance or product is a small quantity of it that shows you what it is like. You ll receive samples of paint, curtains and upholstery... We re giving away 2000… …   English dictionary

• sample — 1. A specimen of a whole entity small enough to involve no threat or damage to the whole; an aliquot. 2. A selected subset of a population; a s. may be random or nonrandom (haphazard), representative or nonrepresentative. [M.E. ensample, fr. L.… …   Medical dictionary

• sample — 1) A small group of items selected from a larger group to represent the characteristics of the larger group. Samples are often used in auditing because it is not feasible to inspect all the available documentation; however, conclusions drawn from …   Accounting dictionary