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Type II error

   Also found in: Dictionary/thesaurus, Legal, Financial, Encyclopedia, Wikipedia 0.02 sec.
type II error,
in a test of a statistical hypothesis, the probability of accepting the null hypothesis when it is false and should be rejected. Also called beta error, error of the second kind.

error [er´or]
a defect or mistake in structure or function.
inborn error of metabolism a genetically determined biochemical disorder in which a specific enzyme defect produces a metabolic block that may have pathologic consequences at birth, as in phenylketonuria, or in later life.
measurement error the difference between what exists in reality and what is measured by a measurement method.
Type I error the rejection of a null hypothesis that is true.
Type II error acceptance of a null hypothesis that is false.

type II error
β error, false-negative error Statistics Acceptance of the null hypothesis when it is false or incorrect, or the error of falsely stating that two proportions are not significantly different when they actually are. See Null hypothesis Cf Type 1 error.


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It is possible that a Type II error may have occurred in the six follow-up analyses because the validity of the Smith's has not been determined, the educational program did not have a strong enough effect, an optical evaluation was not performed on participants, or due to study limitations and weaknesses, which are discussed in the next section.
A Type I error occurs when significance is falsely declared and a Type II error occurs when important differences are not detected.
 
 
 
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