The Zelazo, Zelazo and Kolb (1972) dataset consists of ages (in months) at which an infant starts to walk alone from four different treatment groups (Active-exercise, Passive-exercise, 8 week Control, No-exercise).
A data frame of 23 observations of 4 treatment variables.
Age in months
Active-exercise, Passive-exercise, 8-week Control group, No-exercise
Zelazo, P.R., Zelazo, N.A., and Kolb, S. (1972). "Walking in the Newborn". Science, New Series, 176, 314-315
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