To assess the effect on discriminant analysis in terms of correct classification into two groups, the following parameters were systematically altered using Monte Carlo techniques: sample sizes; proportions of one group to the other; number of independent variables; and covariance matrices. The pairing of the off diagonals (or covariances) with…

One hundred sixty sibling pairs from two child families were sampled for sibling interaction behaviors as they relate to measures of categorization style. The study provides additional evidence of the importance of a child's siblings to his cognitive development. (Editor/RK)

Concepts and methods suggested by cognitive psychology and recent experimental studies of the perception of duration have been employed in this research of judgments of historical duration by children aged between 8 and 15 years. Results indicate a developmental sequence in forms of historical temporal awareness. (Author/RK)