Usually, writing pressures indicate the characteristics of the physique and the personality by strength and weakenss of the writing pressures or by the form of the curves. Results are classified into five types by a personality inventory, which are Zyklothymie, Epilepsie, Schizothymie, Neurasthenia and Hysteria. The author intends to consider the relationship between these personality types and the writing pressures. In the present paper, the author has attempted to classify the personality types by the numbers of zero crossing points of the autocorrelation function and by the form of the power spectral function of the data of the writing pressures.
