A Factorial Analysis of Motor Co-ordination

Part I. The multiple-group method of factoring was used to extract eight factors from the intercorrelations of 21 variables that had been used in the past to measure some phase of motor co-ordination. Five of the factors (balancing objects, tempo, two-handed agility, speed of change of direction of the arms and hands, and body balance) permitted rather clear interpretation. Factors E, G, and H were left unnamed and need further clarification. Part II. A comparison of the centroid and the multiple-group methods of factoring the same data was made. A least squares approximation of the F matrix from the V matrix was made. It was shown, that for all practical purposes, the two methods yield similar solutions when the same communalities are used in both solutions.