Classification of normal gait from pathological gait as then can be used as indicator of falling among subjects requires the correct choice of sensor location in the insole. Such a flexi force- sensor can be used underneath foot to measure vertical ground reaction force. To start with, the most relevant information (parameters) that can characterize the recorded signals are extracted from the vertical ground reaction force signals. Then Receiver Operating Characteristic curve is used to evaluate the features upon 8 sensors underneath each foot located at different locations. To confirm results obtained, features are passed upon a chosen classifier, in this paper K-nearest neighbors algorithm is chosen. Results show that the sensor located at the inner arch of the sole of the foot (i.e. at the mid foot) holds the most relevant information needed for better classification compared to other sensors.
 Beauchet, O., Allali, G., Berrut, G., Hommet, C., Dubost, V. and Assal, F. (2008) Gait Analysis in Demented Subjects: Interests and Perspectives. Neuropsychiatric Disease and Treatment, 4, 155-160. http://dx.doi.org/10.2147/NDT.S2070
 Jeffry, M. and Research, F. (2005) Gait in Parkinson’s Disease. National Institutes of Health, National Parkinson Foundation, and the Parkinson’s Disease Foundation. http://www.physionet.org/
 Worobets, J.T. and Stefanyshyn, D.J. (2005) Normalizing Vertical Ground Reaction Force Peals to Body Weight in Heel-Toe Running. Human Performance Laboratory, Faculty of Kinesiology, University of Calgary.
 Minamisawa, T., Sawahata, H., Takakura, K. and Yamaguchi, T. (2012) Characteristics of Temporal Fluctuation of the Vertical Ground Reaction Force during Quiet Stance in Parkinson’s Disease. Gait & Posture, 35, 308-311. http://dx.doi.org/10.1016/j.gaitpost.2011.09.106