The purpose of this study was to investigate the development
of conservation by using the nonparametric
Mokken scale analysis. Subjects were 801 children
from kindergarten and primary school Grades 1 and 2
who completed 13 conservation tasks derived from Piaget’s
publications. It was shown that some selections
(i.e., seven, eight, and nine tasks, respectively, at
three successive administrations with three-month’s interval)
formed strong Mokken scales, which were invariant
for different samples at the same point in time
of test administration. Furthermore, it was found that
during the course of development the number of tasks
which fitted on the scale increased. However, some
reversals of the relative positions of a small number of
tasks were found for the scales at different points in
time of test administration. It was concluded that application
of nonparametric Mokken scale analysis resulted
in a new, but very useful instrument for analyzing
the order of acquisition of conservation.
Kingma, Johannes & TenVergert, Elisabeth M. (1985). A nonparametric scale analysis of the development of conservation. Applied Psychological Measurement, 9, 375-387. doi:10.1177/014662168500900407
Kingma, Johannes; TenVergert, Elisabeth M..
A nonparametric scale analysis of the development of conservation.
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