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### 18 Cards in this Set

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 Alternative Method A method of calculating reliability by repeating different but equivalent measures at two or more points in time. Construct Validity Validity demonstrated for a measure by showing that it is related to the measure of another concept. Content Validity Validity demonstrated by ensuring that the full domain of a concept is measured Face Validity Validity asserted by arguing that a measure corresponds closely to the concept it is designed to measure. Factor Analysis A statistical techniques useful in the construction of multi-item scales to measure abstract concepts Guttman Scale multi-item measure in which respondents are presented with increasingly difficult measures of approval for an attitude. Index A multi-item measure in which idividual scores on a set of items are combined to form a summary measure Interval Measurement A measure for which a one-unit difference in scores is the same throughout the range of the measures. level of measurement An indication of what is meant by assigning scores of numerals to empirical observation. Nominal measurement A for which different scores represent different, but not ordered, categories. Operational Measurement The rules by which a concept is measured and scores assigned. Ordinal Measurement A measure for which the scores represent ordered categories that are not necessarily equidistant from each other. Ratio Measurement A measure for which the scores possess the full mathematical properties of the numbers assigned. Reliability Te extent to which a measure yields the same result of repeated trials. Semantic Differential A technique for measuring attitudes toward an object in which respondents are presented with a series of opposite adjective pairs. Split halves Method A method of calculating reliability by comparing the results of two equivalent measures made at the same time test-retest method A method of calculating reliability by repeating the same measure at two or more points in time. Validity The correspondence between a measure and the concept it is supposed to measure.