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  2. Luminous efficiency function - Wikipedia

    en.wikipedia.org/wiki/Luminous_efficiency_function

    It is not an absolute reference to any particular individual, but is a standard observer representation of visual sensitivity of theoretical human eye. It is valuable as a baseline for experimental purposes, and in colorimetry .

  3. Norm-referenced test - Wikipedia

    en.wikipedia.org/wiki/Norm-referenced_test

    The primary advantage of norm-reference tests is that they can provide information on how an individual's performance on the test compares to others in the reference group. A serious limitation of norm-reference tests is that the reference group may not represent the current population of interest.

  4. Relative and absolute tense - Wikipedia

    en.wikipedia.org/wiki/Relative_and_absolute_tense

    In the case of absolute tense, the grammatical expression of time reference is made relative to the present moment. It has been pointed out that the term is somewhat misleading, since this kind of time reference is not truly absolute, but is relative to the moment of speaking. [3] Most simple sentences in tensed languages exhibit absolute tense.

  5. Magnitude (astronomy) - Wikipedia

    en.wikipedia.org/wiki/Magnitude_(astronomy)

    Other magnitude systems calibrate by measuring energy directly, without a reference point, and these are called "absolute" reference systems. Current absolute reference systems include the AB magnitude system, in which the reference is a source with a constant flux density per unit frequency, [16] and the STMAG system, in which the reference ...

  6. Absolute dating - Wikipedia

    en.wikipedia.org/wiki/Absolute_dating

    Absolute dating is the process of determining an age on a specified chronology in archaeology and geology. Some scientists prefer the terms chronometric or calendar dating , as use of the word "absolute" implies an unwarranted certainty of accuracy.

  7. Mean absolute scaled error - Wikipedia

    en.wikipedia.org/wiki/Mean_absolute_scaled_error

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  8. Linguistic frame of reference - Wikipedia

    en.wikipedia.org/wiki/Linguistic_frame_of_reference

    Linguistic frame of reference is a frame of reference as it is expressed in a language. A frame of reference is a coordinate system used to identify the physical location of an object. In languages, different frames of reference can be used. They are: the relative frame of reference, the intrinsic frame of reference, and the absolute frame of ...

  9. Bias of an estimator - Wikipedia

    en.wikipedia.org/wiki/Bias_of_an_estimator

    The theory of median-unbiased estimators was revived by George W. Brown in 1947: [8]. An estimate of a one-dimensional parameter θ will be said to be median-unbiased, if, for fixed θ, the median of the distribution of the estimate is at the value θ; i.e., the estimate underestimates just as often as it overestimates.

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