| Type: | Package |
| Title: | Stabilometric Signal Quantification |
| Version: | 0.1.1 |
| Description: | 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) <doi:10.3758/s13428-016-0706-4> "Statokinesigram normalization method"; T E Prieto, J B Myklebust, R G Hoffmann, E G Lovett, B M Myklebust (1996) <doi:10.1109/10.532130> "Measures of postural steadiness: Differences between healthy young and elderly adults"; L F Oliveira et al (1996) <doi:10.1088/0967-3334/17/4/008> "Calculation of area of stabilometric signals using principal component analisys". |
| License: | GPL-3 |
| Encoding: | UTF-8 |
| Imports: | ggplot2, pracma, stats |
| RoxygenNote: | 7.2.3 |
| NeedsCompilation: | no |
| Packaged: | 2022-12-26 21:43:06 UTC; José |
| Author: | Jose Oliveira 
[aut, cre] |
| Maintainer: | Jose Oliveira <josemagalhaesdeoliveira@gmail.com> |
| Repository: | CRAN |
| Date/Publication: | 2023-01-06 22:10:02 UTC |
Quantifies the Angle of a Statokinesigram
Description
Computes the angle of of a given statokinesigram, with respect to the x axis, by fitting an ellipse containing 95 percent of statokinesigram's points.
Usage
sttkangle(dados)
Arguments
dados |
data frame with two columns "x" and "y" |
Details
'dados' is a data frame containing two columns named "x" and "y". The pairs (x, y) are the coordinates of the center of pressure acquired in a period of time.
Value
The angle, in degrees, of the fitted ellipse on the given statokinesigram sttkangle.
Author(s)
Jose Magalhaes de Oliveira
See Also
Examples
x <- c(1,3,7,5,9,4,3,6,8,2,8,9,4,5,7,3,4,7,9,3,2,5,3,4,8,2,9,7,4,2)
y <- c(6,3,9,1,3,7,4,9,6,1,7,3,9,7,2,6,3,4,8,1,9,3,6,8,1,6,2,9,8,3)
COP <- data.frame(x, y)
COPangle <- sttkangle(COP)
Quantifies the Area of a Statokinesigram (Center-of-Pressure displacement)
Description
Computes the area of of a given statokinesigram by fitting an ellipse containing 95 percent of statokinesigram's points.
Usage
sttkarea(dados)
Arguments
dados |
data frame with two columns "x" and "y" |
Details
'dados' is a data frame containing two columns named "x" and "y". The pairs (x, y) are the coordinates of the center of pressure acquired in a period of time.
Value
The area of the given statokinesigram sttkarea.
Author(s)
Jose Magalhaes de Oliveira
See Also
Examples
x <- c(1,3,7,5,9,4,3,6,8,2,8,9,4,5,7,3,4,7,9,3,2,5,3,4,8,2,9,7,4,2)
y <- c(6,3,9,1,3,7,4,9,6,1,7,3,9,7,2,6,3,4,8,1,9,3,6,8,1,6,2,9,8,3)
COP <- data.frame(x, y)
COParea <- sttkarea(COP)
Estimates the Eccentricity of a Statokinesigram.
Description
Computes the eccentricity of the confidence ellipse of a given statokinesigram.
Usage
sttkeccentr(dados)
Arguments
dados |
data frame with two columns "x" and "y" |
Details
'dados' is a data frame containing two columns named "x" and "y". The pairs (x, y) are the coordinates of the center of pressure acquired in a period of time.
Value
The eccentricity of the given statokinesigram eccentr.
Author(s)
Jose Magalhaes de Oliveira
See Also
Examples
x <- c(1,3,7,5,9,4,3,6,8,2,8,9,4,5,7,3,4,7,9,3,2,5,3,4,8,2,9,7,4,2)
y <- c(6,3,9,1,3,7,4,9,6,1,7,3,9,7,2,6,3,4,8,1,9,3,6,8,1,6,2,9,8,3)
COP <- data.frame(x, y)
COPeccentr <- sttkeccentr(COP)
Points of the Confidence Ellipse of a Statokinesigram
Description
Computes the contour of the confidence ellipse of a given statokinesigram, containing 95 percent of statokinesigram's points.
Usage
sttkellipseplot(dados)
Arguments
dados |
data frame with two columns "x" and "y" |
Details
'dados' is a data frame containing two columns named "x" and "y". The pairs (x, y) are the coordinates of the center of pressure acquired in a period of time.
Value
The contour of the ellipse fitted to the given statokinesigram ellctr.
Author(s)
Jose Magalhaes de Oliveira
See Also
Examples
x <- c(1,3,7,5,9,4,3,6,8,2,8,9,4,5,7,3,4,7,9,3,2,5,3,4,8,2,9,7,4,2)
y <- c(6,3,9,1,3,7,4,9,6,1,7,3,9,7,2,6,3,4,8,1,9,3,6,8,1,6,2,9,8,3)
COP <- data.frame(x, y)
COPellipseplot <- sttkellipseplot(COP)
Quantifies the length of a given Center-of-pressure trajectory (statokinesigram)
Description
Computes the length of of a given Center-of-pressure trajectory.
Usage
sttklength(dados)
Arguments
dados |
data frame with two columns "x" and "y" |
Details
'dados' is a data frame containing two columns named "x" and "y". The pairs (x, y) are the coordinates of the center of pressure acquired in a period of time.
Value
The length of the given COP trajectory sttklength.
Author(s)
Jose Magalhaes de Oliveira
See Also
Examples
x <- c(1,3,7,5,9,4,3,6,8,2,8,9,4,5,7,3,4,7,9,3,2,5,3,4,8,2,9,7,4,2)
y <- c(6,3,9,1,3,7,4,9,6,1,7,3,9,7,2,6,3,4,8,1,9,3,6,8,1,6,2,9,8,3)
COP <- data.frame(x, y)
COPlength <- sttklength(COP)
Standardizes Statokinesigrams
Description
confines a given statokinesigram in a circumference of radius equal to 1, without spatially distorting its shape. The circumference contains 95 percent of statokinesigram's points.
Usage
sttknorm(dados)
Arguments
dados |
data frame with two columns "x" and "y" |
Details
'dados' is a data frame containing two columns named "x" and "y". The pairs (x, y) are the coordinates of the center of pressure acquired in a period of time.
Value
The normalized statokinesigram stknorm.
Author(s)
Jose Magalhaes de Oliveira
See Also
Examples
x <- c(1,3,7,5,9,4,3,6,8,2,8,9,4,5,7,3,4,7,9,3,2,5,3,4,8,2,9,7,4,2)
y <- c(6,3,9,1,3,7,4,9,6,1,7,3,9,7,2,6,3,4,8,1,9,3,6,8,1,6,2,9,8,3)
COP <- data.frame(x, y)
COPnorm <- sttknorm(COP)
Quantifies the Lateral Sway Amplitude of a Statokinesigram
Description
Computes the standard deviation of lateral displacement of the center of pressure.
Usage
sttksdx(dados)
Arguments
dados |
data frame with two columns "x" and "y" |
Details
'dados' is a data frame containing two columns named "x" and "y". The pairs (x, y) are the coordinates of the center of pressure acquired in a period of time.
Value
The standard deviation of x sdx.
Author(s)
Jose Magalhaes de Oliveira
See Also
Examples
x <- c(1,3,7,5,9,4,3,6,8,2,8,9,4,5,7,3,4,7,9,3,2,5,3,4,8,2,9,7,4,2)
y <- c(6,3,9,1,3,7,4,9,6,1,7,3,9,7,2,6,3,4,8,1,9,3,6,8,1,6,2,9,8,3)
COP <- data.frame(x, y)
COPxsd <- sttksdx(COP)
Quantifies the front-and-back Sway Amplitude of a Statokinesigram
Description
Computes the standard deviation of front-and-back displacement of the center of pressure.
Usage
sttksdy(dados)
Arguments
dados |
data frame with two columns "x" and "y" |
Details
'dados' is a data frame containing two columns named "x" and "y". The pairs (x, y) are the coordinates of the center of pressure acquired in a period of time.
Value
The standard deviation of y sdy.
Author(s)
Jose Oliveira
See Also
Examples
x <- c(1,3,7,5,9,4,3,6,8,2,8,9,4,5,7,3,4,7,9,3,2,5,3,4,8,2,9,7,4,2)
y <- c(6,3,9,1,3,7,4,9,6,1,7,3,9,7,2,6,3,4,8,1,9,3,6,8,1,6,2,9,8,3)
COP <- data.frame(x, y)
COPysd <- sttksdy(COP)
Velocity of a Center-of-pressure displacement
Description
Computes the mean velocity of a given Center-of-pressure displacement in the horizontal plane.
Usage
sttkveloc(dados, fs)
Arguments
dados |
Data frame with two columns "x" and "y" |
fs |
The sampling frequency used in data recording |
Details
'dados' is a data frame containing two columns named "x" and "y". The pairs (x, y) are the coordinates of the center-of-pressure acquired in a period of time.
Value
The velocity of the COP displacement sttkveloc.
Author(s)
Jose Magalhaes de Oliveira
See Also
Examples
x <- c(1,3,7,5,9,4,3,6,8,2,8,9,4,5,7,3,4,7,9,3,2,5,3,4,8,2,9,7,4,2)
y <- c(6,3,9,1,3,7,4,9,6,1,7,3,9,7,2,6,3,4,8,1,9,3,6,8,1,6,2,9,8,3)
COP <- data.frame(x, y)
fs <- 50
COPvelocity <- sttkveloc(COP,fs)
Quantifies the Median Frequency of the Lateral Displacement of COP.
Description
Computes the median frequency of the lateral displacement of the center of pressure.
Usage
sttkxmdfreq(dados, sampfreq)
Arguments
dados |
data frame with two columns "x" and "y" |
sampfreq |
number The sampling frequency |
Details
'dados' is a data frame containing two columns named "x" and "y". The pairs (x, y) are the coordinates of the center of pressure acquired in a period of time.
Value
The median frequency of the x displacement for the given statokinesigram FMx.
Author(s)
Jose Magalhaes de Oliveira
See Also
Examples
x <- c(1,3,7,5,9,4,3,6,8,2,8,9,4,5,7,3,4,7,9,3,2,5,3,4,8,2,9,7,4,2)
y <- c(6,3,9,1,3,7,4,9,6,1,7,3,9,7,2,6,3,4,8,1,9,3,6,8,1,6,2,9,8,3)
COP <- data.frame(x, y)
COPxmdfreq <- sttkxmdfreq(COP, 50)
Mean lateral velocity of Center-of-pressure displacement
Description
Computes the mean lateral velocity of a given Center-of-pressure displacement.
Usage
sttkxveloc(dados, fs)
Arguments
dados |
Data frame with two columns "x" and "y" |
fs |
The sampling frequency used in data recording |
Details
'dados' is a data frame containing two columns named "x" and "y". The pairs (x, y) are the coordinates of the center-of-pressure acquired in a period of time.
Value
The lateral velocity of the COP displacement sttkxveloc.
Author(s)
Jose Magalhaes de Oliveira
See Also
Examples
x <- c(1,3,7,5,9,4,3,6,8,2,8,9,4,5,7,3,4,7,9,3,2,5,3,4,8,2,9,7,4,2)
y <- c(6,3,9,1,3,7,4,9,6,1,7,3,9,7,2,6,3,4,8,1,9,3,6,8,1,6,2,9,8,3)
COP <- data.frame(x, y)
fs <- 50
COPxvelocity <- sttkxveloc(COP,fs)
Quantifies the Median Frequency of the Anteroposterior Displacement of COP.
Description
Computes the median frequency of the anteroposterior displacement of the center of pressure.
Usage
sttkymdfreq(dados, sampfreq)
Arguments
dados |
data frame with two columns "x" and "y" |
sampfreq |
number The sampling frequency |
Details
'dados' is a data frame containing two columns named "x" and "y". The pairs (x, y) are the coordinates of the center of pressure acquired in a period of time.
Value
The median frequency of the y displacement for the given statokinesigram FMy.
Author(s)
Jose Magalhaes de Oliveira
See Also
Examples
x <- c(1,3,7,5,9,4,3,6,8,2,8,9,4,5,7,3,4,7,9,3,2,5,3,4,8,2,9,7,4,2)
y <- c(6,3,9,1,3,7,4,9,6,1,7,3,9,7,2,6,3,4,8,1,9,3,6,8,1,6,2,9,8,3)
COP <- data.frame(x, y)
COPymdfreq <- sttkymdfreq(COP, 50)
Mean front-to-back velocity of Center-of-pressure displacement
Description
Computes the mean front-to-back velocity of a given Center-of-pressure displacement.
Usage
sttkyveloc(dados, fs)
Arguments
dados |
Data frame with two columns "x" and "y" |
fs |
The sampling frequency used in data recording |
Details
'dados' is a data frame containing two columns named "x" and "y". The pairs (x, y) are the coordinates of the center-of-pressure acquired in a period of time.
Value
The velocity of the front-to-back COP displacement sttkyveloc.
Author(s)
Jose Magalhaes de Oliveira
See Also
Examples
x <- c(1,3,7,5,9,4,3,6,8,2,8,9,4,5,7,3,4,7,9,3,2,5,3,4,8,2,9,7,4,2)
y <- c(6,3,9,1,3,7,4,9,6,1,7,3,9,7,2,6,3,4,8,1,9,3,6,8,1,6,2,9,8,3)
COP <- data.frame(x, y)
fs <- 50
COPyvelocity <- sttkyveloc(COP,fs)