nonrandom sample
1Sample (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… …
2sample — 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.… …
3Bias — In a clinical trial, bias refers to effects that a conclusion that may be incorrect as, for example, when a researcher or patient knows what treatment is being given. To avoid bias, a blinded study may be done. * * * 1. Systematic discrepancy… …
4Amok — (malaiisch: meng âmok ‚in blinder Wut angreifen und töten‘) ist eine psychische Extremsituation, die durch Unzurechnungsfähigkeit und absolute Gewaltbereitschaft gekennzeichnet werden kann. Heute bezeichnet der Begriff meist eine plötzliche,… …
5Gewaltfantasie — Als Gewaltfantasie bezeichnet man eine besondere Form von Fantasie (Vorstellungsbild oder Gedanken) über die absichtliche und zielgerichtete Schädigung, Verletzung oder Tötung anderer Personen oder Tiere. Tötungsfantasien können dabei als… …
6Mathematics and Physical Sciences — ▪ 2003 Introduction Mathematics Mathematics in 2002 was marked by two discoveries in number theory. The first may have practical implications; the second satisfied a 150 year old curiosity. Computer scientist Manindra Agrawal of the… …
7Confidence distribution — This article is about the confidence distribution. For Confidence interval, see Confidence interval. In statistics, the concept of a confidence distribution (CD) has often been loosely referred to as a distribution function on the parameter space …
8Heckman correction — The Heckman correction (the two stage method, Heckman s lambda or the Heckit method) is any of a number of related statistical methods developed by James Heckman in 1976 through 1979 which allow the researcher to correct for selection bias.… …
9isotope — isotopic /uy seuh top ik/, adj. isotopically, adv. /uy seuh tohp /, n. Chem. any of two or more forms of a chemical element, having the same number of protons in the nucleus, or the same atomic number, but having different numbers of neutrons in… …
10Mathematics education — A mathematics lecture at Aalto University School of Science and Technology. Educational Research …
