PNB 3RM3 Chapter Notes - Chapter 5: Discriminant Validity, Concurrent Validity, Demand Characteristics
22 Oct 2020
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Reliability and validity of measurement levels of measurement: Different observers" ratings of an experiment or anything should be highly correlated with each other. Often assessed using cronbach"s a when the judgments are quantitative: used cohen"s k" when judgments are categorical validity: the extent to which scores from a measure represent the variable they are intended to. Although this measure would have extremely good test- retest reliability, it would have absolutely no validity. Having a clear + complete conceptual definition of a construct is a prerequisite for good measurement deciding on an operational definition: using an existing measure. Usually a good idea to use an existing measure that has been successfully used in previous research saves you time already some evidence that the measure is valid. Your results can be more easily compared with and combined with previous results. People can react in a variety of ways to the measure that may reduce reliability and validity scores.
