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

December 18th 2024

acuity grating

a stimulus used to measure an individual’s sharpness of visual perception. It consists of alternating black and white lines spaced closely together; the point at which the participant perceives the lines to be homogeneous gives an indication of visual acuity. When the contrast of the lines is varied, the acuity grating can be used to test contrast sensitivity.