Concurrent Validity Pages 158 - 164 By: Davida R. Molina October 23, 2006
Validity • In order to understand concurrent validity, we must understand validity – most important idea to consider when preparing or selecting an instrument – refers to the degree to which evidence supports any inferences a researcher makes Validity
3 Main Types of Evidence Collected for Validity Content Related Criterion Related Construct Related
Criterion Related Evidence of Validity • Researchers compare performance on 1 instrument with performance on Content another Related • 2 Forms: – Predictive Validity – Concurrent Validity Criterion Related Predictive Validity Construct Related Concurrent Validity
Concurrent Validity • Instrument data and criterion data are gathered at nearly the same time and results are compared Content Related Criterion Related Predictive Validity Construct Related Concurrent Validity
Concurrent Validity • Example: Researcher administers a self-esteem inventory to a group of 8 th graders and compares their scores on it with their teacher’s ratings of students’ self-esteem obtained at about the same time.
Concurrent Validity • A Key Index used is correlation coefficient: – symbolized by “r” – indicates degree of relationship that exists between the scores individuals obtain on 2 instruments – + relationship = both scores are high or both scores are low – - relationship = one score is high and the other is low
Concurrent Validity • Another way to depict criterion related evidence is by using an expectancy table: – 2 way chart – predictor categories are listed vertically on the left – criterion categories are along the top – simple to construct – easy to understand
Concurrent Validity It is important to realize that the nature of the criterion is the most important factor in gathering criterion-related evidence.