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Noncomparative Scale
One of two types of scaling techniques in which each stimulus object is scaled independently of the other objects in the stimulus set.
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Continuous Rating Scale
Also referred to as a graphic rating scale, this measurement scale has the respondents rate the object by placing a mark at the appropriate position on a line that runs from one extreme of the criterion variable to the other.
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Itemized Rating Scale
A measurement scale having numbers and/or brief descriptions associated with each category. The categories are ordered in terms of scale position.
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Likert Scale
A measurement scale with five response categories ranging from "strongly disagree" to "strongly disagree" to "strongly disagree," which requires respondents to indicated a degree of agreement or disagreement with each of a series of statements related to the stimulus objects.
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Semantic Differential
A 7-point rating scale with endpoints associated with bipolar labels that have semantic meaning.
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Stapel Scale
A scale for measuring attitudes that consists of a single adjectives in the middle of an even-numbered range of values, from -5 to +5 without a neutral point (zero)
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Multi-item Scales
A multi-item scale consists of multiple items, where an item is a single question or statement o be evaluated.
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Construct
A specific type of concept that exists at a higher level of abstraction than do everyday concepts.
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Measurement Error
The variation in the information sought by the researcher and the information generated by the measurement process employed.
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True Score Model
A mathematical model that provides a framework for understanding the accuracy of measurement.
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Systematic Error
Systematic error affects the measurement in a constant way and represents stable factors that affect the observed score in the same way each time the measurement is made.
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Random Error
Measurement error that arises from random changes or differences in despondents or measurement situations.
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Reliability
The extent to which a scale produces consistent results if repeated measurements are made on the characteristic.
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Test-Retest Reliability
An approach for assessing reliability in which respondents are administered identical sets of scale items at two different times under as nearly equivalent conditions as possible.
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Alternative-Forms Reliability
An approach for assessing reliability that requires two equivalent forms of the scale to be constructed and then the same respondents are measured at two different times.
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Internal Consistency Reliability
An approach for assessing the internal consistency of the set of times when several items are summated in order to form a total score for the scale.
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Split-half Reliabiity
A form of internal consistency reliability in which the items constituting the scale are divided into two halves and the resulting half scores are correlated.
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Coefficient Alpha
A measure of internal consistency reliability that is the average of all possible split-half coefficients resulting from different splittings of the scale items.
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Validity
The extent to which differences in observed scale scores reflect true differences among objects on the characteristic being measured, rather than systematic or random errors.
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Content Validity
A type of validity sometimes called face validity, that consists of a subjective but systematic evaluation of the representativeness of the content of a scale for the measuring task at hand.
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Criterion Validity
A type of validity, sometimes called face validity, that consists of a subjective but systematic evaluation of the representativeness of the content of a scale for the measuring task at hand.
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Construct Validity
A type of validity that addresses the question of what construct or characteristic the scale is measuring. An attempt is made to answer theoretical questions of why a scale works and what deductions can be made concerning the theory underlying the scale.
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Convergent Validity
A measure of construct validity that measures the extent to which the scale correlates positively with other measures of the same construct.
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Discriminant Validity
A type of construct validity that assesses the extent to which a measure does not correlate with other constructs from which it is supposed to differ.
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Nomological Validity
A type of validity that assesses the relationship between the theoretical construct. It seeks to confirm significant correlations between the constructs as predicted by theory.
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Generalizability
The degree to which a study based on a sample applies to a universe of generalization.
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