How can I know the lenghts of an ellipoid without plotting them using eigen values in R
I have 3 parameters: A, B and C with 20000 data each of them. When I put them together in an 3D graph, they form a dots cloud being A in X axis, B in Y axis and C in Z axis. I want to fix this dots cloud in an 90% covariance error ellipsoid and determine the lenghts, i.e. width, height and strecth, in > 1000 samples individually. Width will be in X axis, height in Y axis and strecth in Z axis). So, for each sample:
How can I know the lenghts of the ellipoid without plotting them using eigen values in R
I have 3 parameters: A, B and C with 20000 data each of them. When I put them together in an 3D graph, they form a dots cloud being A in X axis, B in Y axis and C in Z axis. I want to fix this dots cloud in an 90% covariance error ellipsoid and determine the lenghts, i.e. width, height and strecth, in > 1000 samples individually. Width will be in X axis, height in Y axis and strecth in Z axis). So, for each sample: