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- Technical Manual
- Chapter 1: Introduction
- Chapter 2: Theory and Background
- Chapter 3: Administration and Scoring
- Chapter 4: Scores and Interpretation
- Chapter 5: Case Studies
- Overview
- Case Study 1: Clinical evaluation of an English Speaker Suspected of Having a Speech-Language Impairment
- Case Study 2: Progress Monitoring of an English Learner with Suspected Deficits in Verbal Ability and Language
- Case Study 3: Psychoeducational Evaluation of an English Learner with Suspected Specific Learning Disability
- Chapter 6: Development
- Chapter 7: Standardization
- Chapter 8: Test Standards: Reliability, Validity, and Fairness
- Task Instruction Scripts
Overview |
This chapter provides information about the psychometric properties of the Ortiz Picture Vocabulary Acquisition Test™ (Ortiz PVAT™). In accordance with the Standards for Educational and Psychological Testing (hereinafter referred to as the “Standards”) outlined by the American Educational Research Association, the American Psychological Association, and the National Council on Measurement in Education (AERA, APA, & NCME, 2014), this chapter outlines the reliability, validity, and fairness of the Ortiz PVAT. Reliability refers to the precision of measurement (or degree of error) in an instrument, validity refers to the accuracy of an instrument in measuring and predicting theorized constructs, and fairness refers to the instrument’s theoretical and empirical sensitivity to diversity (AERA, APA, & NCME, 2014). These three components are key properties of psychological and educational assessments and are critical to understanding and interpreting the assessment for its intended use. Analyses reported in this chapter were conducted with SPSS® (IBM Corp., 2012) and packages in R (R Core Team, 2013).
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