zelazo {ISwR}

Age at walking

Description

The zelazo object is a list with four components.

Usage

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; 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.

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: 314–315.