The SLDT-E: NU assesses language-based skills of social interpretation and interaction with friends, the skills found to be most predictive of social language development.
Features and benefits
- Measures the language required to appropriately infer and express what another person is thinking or feeling within a social context, to make multiple interpretations, to take mutual perspectives, and to negotiate with and support peers.
- Reflects the developmental refinement of social language comprehension and expression.
- Differentiates typically developing children from those with autism spectrum disorder (ASD).
- Includes updated normative data, new standard score metrics, new item analysis, and new item bias studies.
- Features four subtests, which require students to make inferences, interprete photographed scenes, and explain how they would resolve problems with peers.
- Examiner’s Manual includes a comprehensive discussion of the test’s theoretical and research-based foundation, item development, standardization, administration and scoring procedures, norms tables, and guidelines for using and interpreting the test’s results.
- Includes new normative data based on the 2015 U.S. Census.
- Features a new standard score metric for subtests and composites (M = 10, SD = 3; M = 100, SD = 15).
- New item analysis and item bias studies provide convincing evidence of content–description validity.
- Features new reliability and validity studies, including diagnostic accuracy analyses, considered the most rigorous techniques for establishing validity. These analyses involve the computation of sensitivity and specificity indexes and the receiving operating characteristc/area under curve statistic (ROC/AUC).
- Average coefficient alpha ranges between .77 and .92 for the subtests and is .94 for the Social Language Development Index.
Social Language Development Index cutoff score of 90 resulted in a sensitivity of .82, a specificity of .86, and a ROC/AUC of .91.