The roundness or sharpness of handwriting patterns is caused by the
phase of the horizontal and vertical pen-tip movements. The velocity signal components of these movements, which are virtually sinusoidal in shape, have a phase delay close to 90 degrees for very round handwriting. The
correlation
In statistics, correlation or dependence is any statistical relationship, whether causal or not, between two random variables or bivariate data. Although in the broadest sense, "correlation" may indicate any type of association, in statisti ...
between Vx(t) and Vy(t) will be low. Sharp handwriting is characterized by a much higher correlation between the horizontal and vertical velocity signal, and a corresponding smaller phase delay.
See also
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Graphonomics
References
Penmanship
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