alpha e. See type I error.
beta e. See type II error.
inborn e. of metabolism Inherited disorders caused by a gene-determined defect; each involves a single enzyme; manifestations may be the result of accumulation of the substance upon which the enzyme acts, a deficiency of the product of the enzyme, or the result of forcing metabolism through an auxiliary path.
interobserver e. Differences in interpretation by two or more researchers recording
observations of the same phenomenon.
intraobserver e. Differences in interpretation by one researcher recording
observations of the same phenomenon at different times.
random e. The variation in a measurement that has no apparent relation to any other
measurement; regarded as due to chance.
refractive e. Defect in the refractive system of the eye that prevents light rays from being brought to a focus on the retina.
systematic e. Error that has an identifiable source.
type I e. Rejection of a true null hypothesis.
type II e. Acceptance of a false null hypothesis.