The data comes from researchers at the University of Michigan as part of a prospective longitudinal study of 214 children.
A data frame with 612 observations on the following 4 variables.
: Age in years (2, 3, 5, 9, 13); the time variable
: Vineland Socialization Age Equivalent: parent-reported socialization, the dependent variable measured at each age
: Sequenced Inventory of Communication Development Expressive Group: categorized expressive language score at age 2 years (1 = Low, 2 = Medium, 3 = High)
: Unique child identifier
Oti, R., Anderson, D., Risi, S., Pickles, A. & Lord, C., Social Trajectories Among Individuals with Autism Spectrum Disorders, Developmental Psychopathology (under review), 2006.
West, B., Welch, K. & Galecki, A, Linear Mixed Models: A Practical Guide Using Statistical Software, Chapman Hall / CRC Press, first edition, 2006.
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