sttkangle               Quantifies the Angle of a Statokinesigram
sttkarea                Quantifies the Area of a Statokinesigram
                        (Center-of-Pressure displacement)
sttkeccentr             Estimates the Eccentricity of a
                        Statokinesigram.
sttkellipseplot         Points of the Confidence Ellipse of a
                        Statokinesigram
sttklength              Quantifies the length of a given
                        Center-of-pressure trajectory (statokinesigram)
sttknorm                Standardizes Statokinesigrams
sttksdx                 Quantifies the Lateral Sway Amplitude of a
                        Statokinesigram
sttksdy                 Quantifies the front-and-back Sway Amplitude of
                        a Statokinesigram
sttkveloc               Velocity of a Center-of-pressure displacement
sttkxmdfreq             Quantifies the Median Frequency of the Lateral
                        Displacement of COP.
sttkxveloc              Mean lateral velocity of Center-of-pressure
                        displacement
sttkymdfreq             Quantifies the Median Frequency of the
                        Anteroposterior Displacement of COP.
sttkyveloc              Mean front-to-back velocity of
                        Center-of-pressure displacement
