Sentences with phrase «selection bias occurs»
Selection bias occurs when the population of students you are looking at is not random but is self selected.
http://commons.trincoll.edu/ Not exact matches
Tegmark and Bostrom argue that such reasoning overlooks a powerful selection effect: If a catastrophe had occurred, we would not be here to observe that it had happened, so our existence makes us biased observers.
In April, an investigation at Rutgers University finally concluded that «substantial (clear and convincing) evidence exists that research fraud has occurred in several areas» including «biased selection of subjects who were to be included in the symmetry / asymmetry comparison groups so as to artificially obtain desired results.»
The two easiest ways for bias to occur in any study is via the method selection and the data selection
was not that warming has occurred; it was that the level of warming was not affected by station selection bias, by homogenization bias, by poor station quality.
These design features prevented protocol subversion due to selection bias in enrollment that might occur with blocked randomization41; we also applied the Berger - Exner test42 to confirm this expectation.