family-wise error rate

the probability of making a Type I error when conducting multiple comparisons among groups within a data set. Although similar to the family-wise alpha level, which is a predetermined probability value to keep the amount of false-positive errors at a manageable level, the family-wise error rate is assessed after a set of hypothesis tests have been conducted. Researchers often like to keep this value at .05. See also testwise error rate.

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Psychology term of the day

May 9th 2024

node of Ranvier

any of successive regularly spaced gaps in the myelin sheath surrounding an axon. The gaps permit the exchange of ions across the plasma membrane at those points, allowing the nerve impulse to leap from one node to the next in so-called saltatory conduction along the axon. [Louis A. Ranvier (1835–1922), French pathologist]