Simulated data from Burchinal, Campbell, Bryant, Wasik, and Ramey (1997) measuring the effect of early educational intervention on cognitive performance in a sample of African-American children at ages 12, 18, and 24 months.
Format
A person-period data frame with 309 rows and 4 columns:
idChild ID.
ageAge in years at time of measurement.
treatmentTreatment condition (control = 0, intervention = 1).
cognitive_scoreCognitive performance score on one of two standardized intelligence tests: the Bayley Scales of Infant Development (Bayley, 1969) at 12 and 18 months, and the the Stanford Binet (Terman & Merrill, 1972) at 24 months.
Source
Burchinal, M. R., Campbell, F. A., Bryant, D. M., Wasik, B. H., & Ramey, C. T. (1997). Early intervention and mediating processes in cognitive performance of children of low income African American families. Child Development, 68, 935–954. https://doi.org/10.2307/1132043
Note
At the request of the researchers, Singer and Willett (2003) did not provide the data from Burchinal, Campbell, Bryant, Wasik, and Ramey's (1997) in order to ensure the privacy of the study's participants. However, the data provided here has been simulated to have similar statistical properties to their study in order to match the estimates and figures presented in the text as best as possible.