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Statistical principles in experimental design.

1962 • 27,228 citations

Formal operations in females from eleven to fifty-four years of age.

1972 • 84 citations

COMPARISON OF RATIOS AND THE CHANCE CONCEPT IN CHILDREN

1970 • 50 citations

EFFECTS OF AGE AND INSTRUCTION ON COMBINATORY ABILITY IN CHILDREN

1970 • 48 citations

TRAINING AND A LOGICAL OPERATION BY CHILDREN1

1960 • 16 citations