Validity Part 1- Construct Validity (Preschool Disability Evaluations: Module 06)

Leaders Project Accuracy (Discriminant Accuracy), Mild Impairment, Moderate Impairment, Normal Distribution/ Bell Curve, Percentile, Reliability, Sensitivity and Specificity, Socioeconomic Status (SES), Standard Deviation (SD), Standard Score, Test Validity, Video

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In this module, Cate discusses the validity of standardized tests and whether they measure what they claim to measure. Most standardized tests lack construct validity and have poor specificity and sensitivity measures. The presence of spectrum bias further reduces the diagnostic accuracy of standardized tests, requiring expertise in disability determinations to diagnose mild to moderate disabilities. Cate explains and demonstrates the problem with using scores from the PLS-4 Spanish and the REEL-3 via the normal bell curve.

Please find related materials here:

Types of Validity in Testing

Understanding the Normal Distribution

Standard Deviation

Find the playlist for the full set of videos in this module series here:

Preschool Disability Evaluations Playlist

Please find links to research mentioned in this module here:

Vance, R. &Plante, E. (1991). Selection of Preschool Language Tests: A Data Based Approach. Language, Speech and Hearing Services in Schools, 25, 15-24.