Instrumentation to Measure Social Persuasion Essay

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Reliability and Validity

Reliability

Reliability refers to the capacity of an instrument to capture the most accurate and "truest" score of an individual. A reliable test enables us to distinguish one individual from another with confidence that errors will primarily be generated by individual differences, and to a lesser extent, to the imperfections of the instrument. Indicators that a test is reliable include test-retest reliability that is accounted for by the internal consistency in the components of the test. The test-retest criteria is generally considered a manifestation of the consistency of measurement for individual performance over time, such that the score a person gets on a test today will be the same -- or nearly the same -- as the score the person gets on a test, say, in three, six, or twelve months. There are a number of substantive issues with the test-retest criteria, including chance covariation, memory, and populations subsets. Chance covariation is a possible factor since there is always a non-zero covariance between any two variables. Indeed, when a number of items on a test are correlated, the reliability of the test is greater since it is better to have more measures of a construct than fewer.

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When the time periods between the testing sessions are too short, the test-taker is likely to remember test items and responses. This means that the scores will be correlated rather than providing a true score. Reliability is not the same for all subsets of a population. For example, while IQ scores age considered to be relatively consistent in the general heterogeneous adult population, the IQ scores of a homogeneous population -- say, for example, college students -- will be less reliable since there are fewer individual differences and the range of IQ scores are likely to be restricted. Poor reliability can negatively impact statistical power; that is, increase the chance of committing a Type II error. Reliability is an important attribute of a test since it conveys the consistency of the instrument.

Part 2. Validity

Schwenk, G. (2009). Evaluating social influence relations: An item-response-modeling approach. Metodoloski zvezki, 6(1), 27-50.

The questionnaire items proposed in this measurement instrument focus on three distinct dimensions of social influence: authority, coercion, and persuasion. The instrumentation is intended to be use in social networks, and uses network autocorrelation models to examine applicability. Of the three….....

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