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Stability of scores for the Slosson Full-Range Intelligence Test
Thomas O Williams1, Ronald C Eaves, Suzanne Woods-Groves
1Department of Teaching and Learning, Virginia Polytechnic Institute and State University, Blacksburg, VA 24061, USA. thwilli1@vt.edu
Psychological Reports
|October 26, 2007
Summary
The Slosson Full-Range Intelligence Test demonstrates strong test-retest reliability. Scores remain stable over time, even with different examiners, indicating consistent intelligence measurement.
Area of Science:
- Psychometrics
- Educational Psychology
- Cognitive Assessment
Background:
- The Slosson Full-Range Intelligence Test (SIT) is a widely used measure of cognitive ability.
- Assessing the stability of intelligence test scores is crucial for their clinical and educational utility.
Purpose of the Study:
- To investigate the test-retest reliability of the Slosson Full-Range Intelligence Test.
- To evaluate score stability across different examiners and a significant time interval.
Main Methods:
- 103 students completed the Slosson Full-Range Intelligence Test on two separate occasions.
- A mean interval of 13.7 months separated the administrations.
- Different examiners administered the test for each session.
Main Results:
- High test-retest reliability coefficients were observed for the Full-Range IQ (.93) and its subscales: Verbal Reasoning (.85), Abstract Reasoning (.80), Quantitative Reasoning (.80), and Memory (.83).
- No statistically significant differences were found between initial and retest scores across all scales.
Conclusions:
- The Slosson Full-Range Intelligence Test exhibits excellent temporal stability.
- The test's reliability is maintained even when administered by different examiners, supporting its consistent use in assessments.
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