zelazo {ISwR} | R Documentation |
Age at walking
Description
The zelazo
object is a list with four components.
Usage
data(zelazo)
Format
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. Received the same types of
social and gross motor stimulation,
but did not have their specific walking and placing reflexes
trained.
- none
- no training. Had no special training, but
were tested along with the children who underwent active or passive
training.
- ctr.8w
- eigth-week controls. Had no training and were only
tested at the age of 8 weeks.
Note
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.
Source
P.R.~Zelazo, N.A.~Zelazo, and S.~Kolb (1972),
``Walking'' in the newborn, Science, 176, 314315.
Examples
data(zelazo)