Description Usage Arguments Value Author(s) References Examples
Smooth tests of goodness-of-fit for multivariate elliptical distributions with diagnostic (Dx) capabilities and
full invariance to affine-linear transformations. By increasing the value of the hyperparameter K
,
the test and the Dx become adaptively consistent against an increasing number of departures from
the null model. The Dx pertains to elements R and U of the Cambanis, Huang & Simons
stochastic representation of elliptical data. Note that p-values can be computed via an asymptotic chi-square approximation or by Monte Carlo.
1 | SmoothECTest(data, K = 7, family = "MVN", Est.Choice = "", Cpp = TRUE)
|
data |
The data set to use. Cases with missing values are removed. |
K |
Integer. Hyperparameter controlling the size of the embedding
family. Should be greater than or equal to 3
for the Multivariate Normal Distribution. The computation time increases
with the size of the data frame and |
family |
The only family available in the current version of the package is the Multivariate Normal Distribution. |
Est.Choice |
Not used yet. Maximum Likelihood Estimation (MLE) or Method of moments. Currently, only the MLE is implemented. |
Cpp |
Logical. If |
List with components:
Q |
The global test statistic with hyperparameter |
dfQ |
Degrees of freedom of the asymptotic chi-square approximation. |
pval.asymp.Q |
Asymptotic p-value for Q. |
Uscaled |
Scaled component U(s)_K tests the uniformity of element U. |
dfU |
Degrees of freedom of the asymptotic chi-square approximation. |
pval.asymp.U |
Asymptotic p-value for |
Iscaled |
Scaled component I(s)_K tests the correlation between R and U. |
dfI |
Degrees of freedom of the asymptotic chi-square approximation. |
pval.asymp.I |
Asymptotic p-value for |
Rscaled |
Scaled component R(s)_K test the distribution of element R, radius of the data. |
dfR |
Degrees of freedom of the asymptotic chi-square approximation. |
pval.asymp.R |
Asymptotic p-value for |
G. R. Ducharme, P. Lafaye De Micheaux
Gilles R. Ducharme, Pierre Lafaye de Micheaux (2019). A Goodness-of-fit Test for Elliptical Distributions with Diagnostic Capabilities. ArXiv pre-print. https://arxiv.org/abs/1902.03622
1 2 3 4 5 6 7 8 9 10 11 12 | # The famous (Fisher's or Anderson's) iris data set
# Increase the value of K to K = 7 for better results.
ressetosa <- SmoothECTest(iris[1:50, -5], K = 3)
ressetosa
# Examination marks (n = 88) in Vectors, Algebra and Statistics from the "Open
# book-Closed book examination" data set (Mardia, Kent and Bibby, 1979,
# p. 3-4).
# Increase the value of K to K = 5 for better results.
data <- scor[, c(2, 3, 5)]
result <- SmoothECTest(data, K = 3)
result
|
Loading required package: orthopolynom
Loading required package: polynom
Loading required package: bootstrap
Smooth Test of H0 : X ~ MVN (K = 3, n * p = 50 * 4)
Stat df p.val.Chi2 Interpretation
Q 25.664 20 0.1772 Global
U-scaled 14.432 16 0.5666 U dist.
I-scaled 5.088 4 0.2783 cor(R,U)
R-scaled 0 0 <NA> R dist.
Smooth Test of H0 : X ~ MVN (K = 3, n * p = 88 * 3)
Stat df p.val.Chi2 Interpretation
Q 28.672 10 0.0014 Global
U-scaled 11.896 7 0.104 U dist.
I-scaled 12.038 3 0.0073 cor(R,U)
R-scaled 0 0 <NA> R dist.
Add the following code to your website.
For more information on customizing the embed code, read Embedding Snippets.