chang | R Documentation |
Compute the radius of a 100(1-\alpha)
% confidence region for the
central orientation based on M-estimation theory.
chang(x, estimator, alp = NULL)
## S3 method for class 'SO3'
chang(x, estimator, alp = NULL)
## S3 method for class 'Q4'
chang(x, estimator, alp = NULL)
x |
|
estimator |
character string either "mean" or "median." |
alp |
alpha level desired, e.g. 0.05 or 0.10. |
Compute the radius of a 100(1-\alpha)
% confidence region for the
central orientation centered at the projected mean or median based on a
result due to chang2001 among others. By construction each axis will
have the same radius so the radius reported is for all three axes. This
method is called "direct" because it uses M-estimation theory for SO(3)
directly instead of relying on the transformation of a result from
directional statistics like prentice
and
fisheretal
do.
chang2001
Radius of the confidence region centered at the specified estimator.
bayesCR
, prentice
,
fisheretal
, zhang
Rs <- ruars(20, rcayley, kappa = 100)
# The chang method can be accesed from the "region" function or the "chang" function
region(Rs, method = "direct", type = "asymptotic", alp = 0.1, estimator = "mean")
chang(Rs, estimator = "mean", alp = 0.1)
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