search for: dataellipse

Hi: Does Ellipse and dataellipse function in R produce the same ellipse? I wanted to see how the radius for the Ellipse function in R calculated. Also what is the var-covariance matrix, if any, assumed for the dataellipse function? Heres an example of the code where I am generating Multivariate normal data and creating ellipse usi...

Hi Everyone, I am working with the R function "dataEllipse". I plot the 95% confidence ellipses for several different samples in the same plot and I color-code the ellipse of each sample, but I do not know how to specify a different line pattern for each ellipse. I can only modify the pattern for all ellipses with the "lty" argument. Any hel...

...construyo pero de manera "bruta" y quiere encontrar una manera más eficiente. El gráfico en cuestión tiene más partes pero para simplificar la parte que me interesa es esta: [image: Imágenes integradas 5] Esto es una elipse de confianza de unos puntos, la elipse la consigo ayudándome de dataEllipse (paquete car), para llegar a este gráfico lo hago de la siguiente manera: -Construyo una función que me dice si un punto (x,y) está dentro o no de la elipse. -Hago un mallado de 100x100 (en pasos de 0,125) y miro si estoy dentro de la elipse o no (*Esto es lo que quiere evitar) *(podría hacer el...

(I'm afraid this post didn't reach the list on last Wednesday, here it is again ) hi R-list, And sorry for my frenglish ! I am running R < Good Sport > release ( i386-w64-mingw32/i386 (32-bit) ) ) under Windows 7 Professional, Service Pack 1. My perl executable is ActivePerl build 817 [257965] (i.e. version 5.8.8.817). Usually it is working fine. Using the gdata ::read.xls

Hi, I'm using the R library(car) to draw confidence/prediction ellipses in a scatterplot. >From what i understood the ellipse() function return an ellipse based parameters: shape, center, radius . If i read dataEllipse() function i can see how these parameters are calculated for a confidence ellipse. ibrary(car) a=c(12,12,4,5,63,63,23) b=c(13,15,7,10,73,83,43) v <- cov.trob(cbind(a, b)) shape <- v$cov center <- v$center radius <- sqrt(2 * qf(0.95, 2, length(a) - 1)) # radius <- sqrt(dfn * qf(...

hi,R users, Now I have some scatter figures, is there some method can plot equalprobable error ellipse ? -- TANG Jie Email: totangjie@gmail.com Tel: 0086-2154896104 Shanghai Typhoon Institute,China [[alternative HTML version deleted]]

Hi, I created a principal component plot using the first two principal components. I used the function princomp() to calculate the scores. now, I would like to superimpose an ellipse representing the center and the 95% confidence interval of a series of points in my plot (as to illustrate the grouping of my samples). I looked at the ellipse() function in the ellipse package but can't get it