ERIC Number: EJ724231
Record Type: Journal
Publication Date: 2005
Reference Count: N/A
Age Differences within Secular IQ Trends: An Individual Growth Modeling Approach
Kanaya, Tomoe; Ceci, Stephen J.; Scullin, Matthew H.
Intelligence, v33 n6 p613-621 Nov-Dec 2005
Age differences within the yo-yo trend in IQ, caused when aging norms that produce inflated scores are replaced with new norms, were examined using longitudinal WISC, WISC-R and WISC-III records of students tested for special education services from 10 school districts. Descriptive and individual growth modeling analyses revealed that while the secular pattern in IQ has not changed over time, the role of age within this pattern has. Specifically, the decline in test scores that occurs when new norms replace older ones was smaller for older children in earlier testings. These differences, however, disappeared in more current testings. The results reveal that the relationship between IQ and age is complex and, further, shows the benefits of using individual growth modeling to uncover patterns within longitudinal data that would otherwise be obscured with more traditional analytic techniques.
Descriptors: Norms, Intelligence Quotient, Age Differences, Trend Analysis, Scores, Intelligence Tests, Individual Development, School Districts, Special Education, Student Evaluation
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Publication Type: Journal Articles; Reports - Evaluative
Education Level: Elementary Education
Authoring Institution: N/A