Nickola Nelson, Elena Plante, Nancy Helm-Estabrooks, Gillian Hotz
This concise manual presents the powerful research and technical data behind the Test of Integrated Language and Literacy Skills™ (TILLS™). Professionals will find clear answers to frequently asked questions about the technical data as they learn the specifics of TILLS development and field testing and the composition of the normative sample.
Full chapters are devoted to the validity of TILLS, the reliability of TILLS, and the evaluation and reduction of test bias. Readers will get valuable information on
With this comprehensive resource on the unparalleled research behind TILLS, professionals will be confident that their language and literacy assessments will be completed with an extensively tested, psychometrically sound tool.
Criteria for Inclusion in the Normative Sample
Composition of the Normative Sample
Recruitment and Training of Test Administrators During Standardization
Test Development
Field Test 1
Field Test 2
Field Test 3
Frequently Asked Questions
Validity for Purpose 1: Identifying Language and Literacy Disorders
Identification of Language and Literacy Disorders at Different Ages
Results for Subgroups of Students with Language Disorders
Sensitivity to Students at Risk for but Not Identified as Having Language and Literacy Disorders
Validity for Purpose 2: Profiling Strengths and Weaknesses
Students with Language and Literacy Disorders versus Typically Developing Peers
Patterns of Strengths and Weaknesses for Different Diagnostic Groups
Validity for Purpose 3: Tracking Change Over Time
Determining True Gains or Losses
Other Aspects of Construct Validity
Evidence that TILLS Scores Reflect Age-Related Change
Evidence that TILLS Measures Skills at the Sound/Word and Sentence/Discourse Levels
Concurrent Validity
Frequently Asked Questions
Intraclass Reliability
Testmdash;Retest
Reliability
Interrater Reliability
Measuring Students’ Abilities Reliably
Frequently Asked Questions
Statistical Evaluation of Item Bias
Assessment of Item-Level Bias
Assessment of Subtest-Level Bias
Implications of Score Differences for Interpreting TILLS Results
Frequently Asked Questions
References
Appendix Contributors to TILLS Development and Standardization