I have need of some way to compare and assess the relationship between two
or more motion vs time curves during walking. I am working in the foot and
have 3D data on the tibia, hindfoot, midfoot and first ray during walking.
I would like to know how much, if any motion at one segment contributes to
another. I have used pearson correlation coefficients, but it seems to be
fairly non-specific. Correlation of specific points on the curve also has
proven disappointing. Does anyone out there have any suggestions? I would
appreciate any help you could give me. Thanks in advance.

Mark W. Cornwall, PhD, PT, CPed
Gait Research Laboratory
Dept. of Physical Therpay
Northern Arizona University
P.O. Box 15105
Flagstaff, AZ 86011
(520) 523-1606
(520) 523-9289 FAX