zelazo | R Documentation |
The zelazo
object is a list with four components.
zelazo
This is a list containing data on age at walking (in months) for four groups of infants:
active
test group receiving active training; these children had their walking and placing reflexes trained during four three-minute sessions that took place every day from their second to their eighth week of life.
passive
passive training group; these children received the same types of social and gross motor stimulation, but did not have their specific walking and placing reflexes trained.
none
no training; these children had no special training, but were tested along with the children who underwent active or passive training.
ctr.8w
eighth-week controls; these children had no training and were only tested at the age of 8 weeks.
When asked to enter these data from a text source, many students will use one vector per group and will need to reformat data into a data frame for some uses. The rather unusual format of this data set mimics that situation.
P.R. Zelazo, N.A. Zelazo, and S. Kolb (1972), “Walking” in the newborn, Science, 176: 314–315.
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