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| Process of assigning numbers or labels to persons, objects, or events in accordance with speciic rules for representing quantities or qualities of attributes. |
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| Guide, method or command that tells a researcher what to do. |
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| Specific types of concepts that exist at higher levels of abstraction. |
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| Statement of the meaning of the central idea or concept under study, establishing its boundaries; also known as theoretical, or conceptual, definition. |
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| Statement of precisely which observable characteristics will be measured and the process for assigning a value to the concept. |
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| Set of symbols or numbers so constructed that the symbols or numbers can be assigned by a rule to the individuals (or their behaviors or attitudes) to whom the scale is applied. |
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| Scales that partition data into mutually exclusive and collectively exhaustive categories. |
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| Scales that maintain the labeling characteristics of nominal scales and have the ability to order data. |
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| Scales that have the characteristics of ordinal scales, plus equalintervals between points to show relative amounts; they may include an arbitrary zero point. |
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| Scales that have the characteristics of interval scales, plus a meaningful zero point so that magnitudes can be compared arithmetically. |
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| Degree to which measures are free from random error and, therefore, provide consistent data. |
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| Ability of the same instrument to produce consistent results when used a second time under conditions as similar as possible to the original conditions. |
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| Lack of change in results from test to retest. |
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| Equivalent From Reliability |
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Definition
| Ability of two very similar forms of an instrument to produce closely correlated results. |
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| Internal Consistency Reliability |
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Definition
| Ability of an instrument to produce similar results when used on different samples during the same time period to measure a phenomenon. |
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Definition
| Method of assessing the reliability of a scale by dividing the total set of measurement items in half and correlating the results. |
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Definition
| Degree to which what the researcher was trying to measure was actually measured. |
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| Degree to which a measurement seems to measure what it is supposed to measure. |
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| Representativeness, or sampling adequacy, of the content of the measurement instrument. |
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| Criterion-Related Validity |
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| Degree to which a measurement instrument can predict a variablethat is designated a criterion. |
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| Degree to which another variable, measure at the same point in time as the variable of interest, can be predicted by the measurement instrument. |
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| Degree to which a measurement instrument represents and logically connects, via the underlying theory, the observed phenomenon to the construct. |
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| Degree of correlation among different measurement instruments that purport to measure the same construct. |
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| Measure of the lack of association among constructs that are supposed to be different. |
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