Vine copulas are a flexible class of dependence models consisting of bivariate building blocks (see e.g., Aas et al., 2009). You can find a comprehensive list of publications and other materials on vine-copula.org.
This package is primarily made for the statistical analysis of vine copula models. The package includes tools for parameter estimation, model selection, simulation, goodness-of-fit tests, and visualization. Tools for estimation, selection and exploratory data analysis of bivariate copula models are also provided. Please see the API documentation for a detailed description of all functions.
The library is no longer actively developed, but will continued to be maintained. Check out the rvinecopulib package for an alternative with several benefits:
-
a sleaker and more modern API,
-
shorter runtimes, especially in high dimensions,
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nonparametric and multi-parameter families,
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ability to model discrete variables.
You can install:
-
the stable release on CRAN:
install.packages("VineCopula") -
the latest development version:
# install.packages("remotes") remotes::install_github("tnagler/VineCopula")
Below, we list most functions and features you should know about. As usual in copula models, data are assumed to be serially independent and lie in the unit hypercube.
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BiCop: Creates a bivariate copula by specifying the family and parameters (or Kendall's tau). Returns an object of classBiCop. The class has the following methods:-
print,summary: a brief or comprehensive overview of the bivariate copula, respectively. -
plot,contour: surface/perspective and contour plots of the copula density. Possibly coupled with standard normal margins (default forcontour).
-
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BiCopSim: Simulates from a bivariate copula. -
BiCopEst: Estimates parameters of a bivariate copula with a prespecified family. Estimation can be done by maximum likelihood (method = "mle") or inversion of the empirical Kendall's tau (method = "itau", only available for one-parameter families). Returns an object of classBiCop. -
BiCopSelect: Estimates the parameters of a bivariate copula for a set of families and selects the best fitting model (using either AIC or BIC). Returns an object of classBiCop. -
BiCopGofTest: Goodness-of-Fit tests for bivariate copulas. -
BiCopVuongClarke: Vuong and Clarke tests for model comparison within a prespecified set of copula families. -
BiCopPar2Tau,BiCopTau2Par,BiCopPar2Beta,BiCopPar2TailDep: Conversion between dependence measures and parameters (for a given family). Functions are vectorized in all arguments. -
Evaluate functions related to a bivariate copula:
BiCopPDF,BiCopCDF,BiCopDeriv,BiCopDeriv2,BiCopHfunc,BiCopHfuncDeriv,BiCopHfuncDeriv2,BiCopHinv. Functions are vectorized in thefamily,par, andpar2arguments. -
BiCopKDE: Kernel density plots for copula data. -
BiCopLambda,BiCopKPlot,BiCopChiPlot: Further plot types for the analysis of bivariate copulas.
For most functions, you can provide an object of class BiCop instead of
specifying family, par and par2 manually.
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RVineMatrix: Creates a vine copula model by specifying structure, family and parameter matrices. Such matrices have been introduced by Dissman et al. (2013). Returns an object of classRVineMatrix. The class has the following methods:-
plot: Plots the trees of the the R-vine tree structure. Optionally, you can annotate the edges with pair-copula families and parameters. -
contour: Creates a matrix of contour plots associated with the pair-copulas.
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RVineSim: Simulates from a vine copula model. -
RVineSeqEst: Estimates the parameters of a vine copula model with prespecified structure and families. -
RVineCopSelect: Estimates the parameters and selects the best family for a vine copula model with prespecified structure matrix. -
RVineStructureSelect: Fits a vine copula model assuming no prior knowledge. It selects the R-vine structure using Dissmann et al. (2013)'s method, estimates parameters for various families, and selects the best family for each pair. -
RVineGoFTest: Goodness-of-Fit tests for a vine copula model (c.f., Schepsmeier, 2013, 2015). Related functions areRVineGrad,RVineHessian,RVineStdError, andRVinePIT. -
RVineVoungTest,RVineClarkeTest: Vuong and Clarke tests for comparing two vine copula models. -
RVinePar2Tau,RVinePar2Beta: Calculate dependence measures corresponding to a vine copula model. -
RVinePDF,RVineCDF,RVineLogLik,RVineAIC,RVineBIC: Calculate the density, cumulative distribution, log-likelihood, AIC, and BIC of a vine copula.
The functions C2RVine and D2RVine create RVineMatrix objects for C- and
D-vine copulas. This is particularly useful for former users of the CDVine
package.
Furthermore, bivariate and vine copula models from this packages can be used
with the copula package
(Hofert et al., 2015). For example, vineCopula transforms an RVineMatrix
object into an object of class vineCopula which provides methods for
dCopula, pCopula, and rCopula. For more details, we refer to the package
manual.
In this package several bivariate copula families are included for bivariate and multivariate analysis using vine copulas. It provides functionality of elliptical (Gaussian and Student-t) as well as Archimedean (Clayton, Gumbel, Frank, Joe, BB1, BB6, BB7 and BB8) copulas to cover a large range of dependence patterns. For Archimedean copula families, rotated versions are included to cover negative dependence as well.
The Tawn copula is a non-exchangable extension of the Gumbel copula with three parameters. For simplicity, we implemented two versions of the Tawn copula with two parameters each. Each type has one of the asymmetry parameters fixed to 1, so that the corresponding copula density is either left- or right-skewed (relative to the main diagonal). In the manual we will call these two new copulas "Tawn type 1" and "Tawn type 2".
The following table shows the parameter ranges of bivariate copula families with
parameters par and par2 and internal coding family:
| Copula family | family |
par |
par2 |
|---|---|---|---|
| Gaussian | 1 |
(-1, 1) |
- |
| Student t | 2 |
(-1, 1) |
(2,Inf) |
| (Survival) Clayton | 3, 13 |
(0, Inf) |
- |
| Rotated Clayton (90 and 270 degrees) | 23, 33 |
(-Inf, 0) |
- |
| (Survival) Gumbel | 4, 14 |
[1, Inf) |
- |
| Rotated Gumbel (90 and 270 degrees) | 24, 34 |
(-Inf, -1] |
- |
| Frank | 5 |
R \ {0} |
- |
| (Survival) Joe | 6, 16 |
(1, Inf) |
- |
| Rotated Joe (90 and 270 degrees) | 26, 36 |
(-Inf, -1) |
- |
| (Survival) Clayton-Gumbel (BB1) | 7, 17 |
(0, Inf) |
[1, Inf) |
| Rotated Clayton-Gumbel (90 and 270 degrees) | 27, 37 |
(-Inf, 0) |
(-Inf, -1] |
| (Survival) Joe-Gumbel (BB6) | 8, 18 |
[1 ,Inf) |
[1, Inf) |
| Rotated Joe-Gumbel (90 and 270 degrees) | 28, 38 |
(-Inf, -1] |
(-Inf, -1] |
| (Survival) Joe-Clayton (BB7) | 9, 19 |
[1, Inf) |
(0, Inf) |
| Rotated Joe-Clayton (90 and 270 degrees) | 29, 39 |
(-Inf, -1] |
(-Inf, 0) |
| (Survival) Joe-Frank (BB8) | 10, 20 |
[1, Inf) |
(0, 1] |
| Rotated Joe-Frank (90 and 270 degrees) | 30, 40 |
(-Inf, -1] |
[-1, 0) |
| (Survival) Tawn type 1 | 104, 114 |
[1, Inf) |
[0, 1] |
| Rotated Tawn type 1(90 and 270 degrees) | 124, 134 |
(-Inf, -1] |
[0, 1] |
| (Survival) Tawn type 2 | 204, 214 |
[1, Inf) |
[0, 1] |
| Rotated Tawn type 2 (90 and 270 degrees) | 224, 234 |
(-Inf, -1] |
[0, 1] |
This small shiny app enables the user to draw nice tree plots of an R-Vine
copula model using the package
d3Network. Models have to be
set up locally in an RVineMatrix object and uploaded as .RData file. The page
is still under construction.
Author: Ulf Schepsmeier
https://rvinegraph.shinyapps.io/rvinegraph
Aas, K., C. Czado, A. Frigessi, and H. Bakken (2009). Pair-copula constructions of multiple dependence. Insurance: Mathematics and Economics 44 (2), 182-198.
Bedford, T. and R. M. Cooke (2001). Probability density decomposition for conditionally dependent random variables modeled by vines. Annals of Mathematics and Artificial intelligence 32, 245-268.
Bedford, T. and R. M. Cooke (2002). Vines - a new graphical model for dependent random variables. Annals of Statistics 30, 1031-1068.
Brechmann, E. C., C. Czado, and K. Aas (2012). Truncated regular vines in high dimensions with applications to financial data. Canadian Journal of Statistics 40 (1), 68-85.
Brechmann, E. C. and C. Czado (2011). Risk management with high-dimensional vine copulas: An analysis of the Euro Stoxx 50. Statistics & Risk Modeling, 30 (4), 307-342.
Brechmann, E. C. and U. Schepsmeier (2013). Modeling Dependence with C- and D-Vine Copulas: The R Package CDVine. Journal of Statistical Software, 52 (3), 1-27. https://doi.org/10.18637/jss.v052.i03.
Czado, C., U. Schepsmeier, and A. Min (2012). Maximum likelihood estimation of mixed C-vines with application to exchange rates. Statistical Modelling, 12(3), 229-255.
Dissmann, J. F., E. C. Brechmann, C. Czado, and D. Kurowicka (2013). Selecting and estimating regular vine copulae and application to financial returns. Computational Statistics & Data Analysis, 59 (1), 52-69.
Eschenburg, P. (2013). Properties of extreme-value copulas Diploma thesis, Technische Universitaet Muenchen https://mediatum.ub.tum.de/node?id=1145695.
Hofert, M., I. Kojadinovic, M. Maechler, and J. Yan (2015). copula: Multivariate Dependence with Copulas. R package version 0.999-13 https://cran.r-project.org/package=VineCopula
Joe, H. (1996). Families of m-variate distributions with given margins and m(m-1)/2 bivariate dependence parameters. In L. Rueschendorf, B. Schweizer, and M. D. Taylor (Eds.), Distributions with fixed marginals and related topics, pp. 120-141. Hayward: Institute of Mathematical Statistics.
Joe, H. (1997). Multivariate Models and Dependence Concepts. London: Chapman and Hall.
Knight, W. R. (1966). A computer method for calculating Kendall's tau with ungrouped data. Journal of the American Statistical Association 61 (314), 436-439.
Kurowicka, D. and R. M. Cooke (2006). Uncertainty Analysis with High Dimensional Dependence Modelling. Chichester: John Wiley.
Kurowicka, D. and H. Joe (Eds.) (2011). Dependence Modeling: Vine Copula Handbook. Singapore: World Scientific Publishing Co.
Nelsen, R. (2006). An introduction to copulas. Springer
Nagler, T. (2015). kdecopula: Kernel Smoothing for Bivariate Copula Densities. R package version 0.6.0. https://cran.r-project.org/package=kdecopula
Schepsmeier, U. and J. Stoeber (2012). Derivatives and Fisher information of bivariate copulas. Statistical Papers, 55 (2), 525-542. https://link.springer.com/article/10.1007/s00362-013-0498-x.
Schepsmeier, U. (2013) A goodness-of-fit test for regular vine copula models. Preprint. https://arxiv.org/abs/1306.0818.
Schepsmeier, U. (2015) Efficient information based goodness-of-fit tests for vine copula models with fixed margins. Journal of Multivariate Analysis 138, 34-52.
Stoeber, J. and U. Schepsmeier (2013). Estimating standard errors in regular vine copula models. Computational Statistics, 28 (6), 2679-2707 https://link.springer.com/article/10.1007/s00180-013-0423-8.
White, H. (1982) Maximum likelihood estimation of misspecified models, Econometrica, 50, 1-26.