Stabilometric Signal Quantification

Functions for stabilometric signal quantification. The input is a data frame containing the x, y coordinates of the center-of-pressure displacement. Jose Magalhaes de Oliveira (2017) "Statokinesigram normalization method"; T E Prieto, J B Myklebust, R G Hoffmann, E G Lovett, B M Myklebust (1996) "Measures of postural steadiness: Differences between healthy young and elderly adults"; L F Oliveira et al (1996) "Calculation of area of stabilometric signals using principal component analisys".