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| produced by any factor that introduces inaccuracies into the measurement of some variable |
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| the extent to which measures of the same phenomenon are consistent and repeatable; measures high in reliability will contain a minimum of measurement error |
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| in general, the extent to which a measure of x truly measures x and not y |
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| occurs when a measure appears to be a reasonable or logical measure of some trait |
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| occurs when a measure appears, to those taking a test, to be a reasonable measure of some trait; not considered by researchers to be an important indicator of validity |
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| form of validity in which a psychological measure is able to predict some future behavior or is meaningfully related to some other measure |
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| in measurement, it occurs when the measure being used accurately assesses some hypothetical construct; also refers to whether the construct itself is valid ; in research, refers to whether the operational definitions used for independent and dependent variables are valid |
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| occurs when scores on a test designed to measure some construct are correlated with scores on other tests that are theoretically related to the construct |
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| occurs when scores on a test designed to measure some construct are uncorrelated with scores on other tests that should be theoretically unrelated to the construct |
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| ways of assigning numbers to events; see nominal, ordinal, interval and ratio scales |
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| measurement scale in which the numbers have no quantitative value, but rather serve to identify categories into which events can be placed |
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| measurement scale in which numbers refer to quantities, and intervals are assumed to be of equal size; a score of zero is just one of many points on the scale and does not denote the absence of the phenomenon being measured |
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| measurement scale in which numbers refer to quantities and intervals are assumed to be of equal size; a score of zero denotes the absence of the phenomenon being measured |
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| measurement scale in which assigned numbers stand for relative standing or ranking |
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