PSYC 217 Lecture Notes - Lecture 17: Pearson Product-Moment Correlation Coefficient, Face Validity, Predictive Validity
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Learning objectives: state the key questions used to evaluate a measure, define reliability and its types, define construct validity at its type. Identify example of each type of reliability and validity: explain the role reliability and validity play in research. Measurement is very important; for that reason, we need to make sure that we measure in a stable, reliable way. Recall that the score consists of the true score and error, and that the better the measure, the closer the score is to the true score. Reliability can be measure using a test-retest measure which is evaluated using the pearson correlation coefficient. The higher the correlation, the closer to +1 it is; the more negative the correlation, the closer to -1 it is. Inter-rater reliability is evaluated by the intraclass correlation coefficient (icc) which is similar to the pearson coefficient except the icc ranges from 0 to +1. 0 means no relationship and 1 means a perfect relationship.
