Skip to contents

Piagetian monkeys

Source: R/data.R
monkeys.Rd

Data from Ha, Kimpo, and Sackett (1997) measuring age of first demonstration of object recognition in a sample of 123 pigtailed macaques. Monkeys were followed for up to 37 days or until they demonstrated the classic Piagetian stage of development known as object recognition.

Usage

monkeys

Format

A person-level data frame with 123 rows and 7 columns:

id

Monkey ID.

sessions

Number of sessions the monkey completed until demonstrating object recognition.

initial_age

Age at initial testing in days.

end_age

Age at end of testing in days.

censor

Censoring status.

birth_weight

Decile equivalent of the monkey's birth weight in comparison to colony-wide sex-specific standards.

female

Binary indicator for whether the adolescent is a female.

Source

Ha, J. C., Kimpo, C. L., & Sackett, G. P. (1997). Multiple-spell, discrete-time survival analysis of developmental data: Object concept in pigtailed macaques. Developmental Psychology, 33, 1054–1059. https://doi.org/10.1037//0012-1649.33.6.1054