No articles match
Numerically stable Frank Copulas via Multiprecision (Rmpfr)5 months ago
The diagonal density of Frank's copula | Computing the ``diagonal MLE'' | Session Information | Conclusion
Beautiful Spearman's Rho for AMH Copula5 months ago
Introduction | Archimedean copulas | Spearman's Rho for AMH
Nested Archimedean Copulas Meet R5 months ago
Introduction | Archimedean copulas | Nested Archimedean copulas | Outer power Archimedean copulas | Session Information | Conclusion
Bessel Functions in other CRAN Packages6 months ago
Introduction | Package `gsl' | Session Info
Simulations for Robust Regression Inference in Small Samples10 months ago
Introduction | Setting | Simulation | Simulation Results | Maximum Asymptotic Bias | Session Information
2nd Introduction to the Matrix Package1 years ago
Introduction | Matrix Classes | More detailed examples of ``Matrix'' operations | Notes about S4 classes and methods implementation | Session Info
log1pmx, bd0, stirlerr - Probability Computations in R1 years ago
Introduction | Loader's Binomial Deviance D0(x,M) = bd0(x, M) | Accuracy of log1pmx(x) Computations | Accuracy of p1l1(t) Computations | Accuracy of stirlerr(x)=delta(x) Computations
Examples of Nonstandard Copulas -- "Wild Animals"1 years ago
1 Swiss Alps copulas of Hofert, Vrins (2013) | Lambda and its inverse | M and its inverse (for $M_i, i=1,2$): | S and its inverse (for $S_i, i=1,2$) | Wrappers for $p_1$ and $p_2$ and their inverses: | Define the copula $C$ | Draw n vectors of random variates from $C$ | 2 An example from Wolfgang Trutschnig and Manuela Schreyer | Define the Iterated Function System | Run chaos game B times | 3 Sierpinski tetrahedron | Session information
MLE and Quantile Evaluation for a Clayton AR(1) Model with Student Marginals1 years ago
Generating the data | Estimation under unknown marginal parameters | Plot some true and estimated conditional quantile functions
covMcd() -- Generalizing the FastMCD2 years ago
Introduction | MCD and ``the Fast'' MCD (= fastmcd) Algorithm | Fast MCD Algorithm – General notation
Definitions of Psi-Functions Available in Robustbase2 years ago
Monotone psi-Functions | Redescenders
Dip Test Distributions, P-values, and other Explorations2 years ago
Introduction | History of the diptest package | 21st Century Improvement of Hartigan2's Table | The Dip in the Dip's Distribution | P-values for the Dip Test | Less Conservative Dip Testing | Session Info
Rounding to Decimal Digits in Binary3 years ago
Intro | The Easy Problem "in Theory" | Rounding to Integers | Rounding to non-zero Digits | Versions of round()ing - The Story | Alternative Approaches | Session information
Comparisons of Least Squares calculation speeds3 years ago
Linear least squares calculations
Design Issues in Matrix package Development3 years ago
The Matrix class structures | Matrix Transformations | Session Info
Sparse Model Matrices3 years ago
One factor: y f1 | One factor, one continuous: y f1 + x | Two (or more) factors, main effects only: y f1 + f2 | Interactions of two (or more) factors,.....
Asymptotic Tail Formulas For Gaussian Quantiles3 years ago
Gaussian Quantiles in R | Correcting qnorm(., log.p=TRUE) | Fully accurate asymptotic qnorm(., log.p=TRUE) | Concluding summary | Computational details, session information | relErrV() (from sfsmisc) | p.qnormAsy2() for optimal cutpoints
Arbitrarily Accurate Computation with R Package Rmpfr3 years ago
Introduction | Arithmetic with mpfr-numbers | ``All'' mathematical functions, arbitrarily precise | Arbitrarily precise matrices and arrays | Special mathematical functions | Integration highly precisely | Miscellaneous | Conclusion
Accurately Computing log(1 - exp(.)) -- Assessed by Rmpfr3 years ago
Introduction: Not log() nor exp(), but log1p() and expm1() | log1p() and expm1() for log(1 - exp(x)) | Computation of log(1+exp(x)) | Conclusion
Densities of Two-Level Nested Archimedean Copulas4 years ago
Examples (sampling and evaluating the log-likelihood) | Example 1: ((1,2), (3,4,5))-Gumbel | Example 2: (1, (2,3), 4, (5,6,7))-Gumbel | Example 3: (1, (2,3))-Gumbel | Plots of the negative log-likelihood | Determine the values of the negative log-likelihood on a grid | Plotting | Computing the MLE (via optimization)
Exploring Empirical Copulas4 years ago
1 Auxiliary functions | 2 Checking the various (smoothed) empirical copulas | 3 Application to show non-uniqueness of Sklar's Theorem for Bernoulli margins
Archimedean Liouville Copulas4 years ago
Archimedean-Simplex copulas | Liouville copulas | Archimedean-Liouville copulas
Hierarchical Archimax Copulas4 years ago
Setup and auxiliary functions | 1 ACs vs AXCs vs NACs vs (different) HAXCs | 1.1 AC (Clayton copula) | 1.2 AXC (Clayton frailties and Gumbel EVC) | 1.3 NAC (nested Clayton) | 1.4 HAXC (hierarchical Clayton frailties and Gumbel EVC) | 1.5 HAXC (hierarchical Clayton frailties and hierarchical Gumbel EVC, same hierarchical structure) | 1.6 HAXC (hierarchical Clayton frailties and hierarchical Gumbel EVC, different hierarchical structure) | 2 EVCs vs HEVCs vs (different) HAXCs | 2.1 EVC | 2.2 HEVC | 2.3 HAXC (Clayton frailty and HEVC) | 2.4 HAXC (hierarchical Clayton frailties and EVC) | 2.5 HAXC (hierarchical Clayton frailties and HEVC, same hierarchical structure) | 2.6 HAXC (hierarchical Clayton frailties and HEVC, different hierarchical structure)
Quasi-Random Numbers for Copula Models4 years ago
1 Quasi-random numbers for copula models via conditional distribution method | Independence copula | Clayton copula | $t$ copula with three degrees of freedom | Marshall--Olkin copula | 3d $t$ copula with three degrees of freedom | 3d R-Vine copula | 2 Quasi-random numbers for copula models via stochastic representations | 2.1 Colorized scatter plot | Colorized scatter plot (quasi-random numbers and CDM) | Colorized scatter plots (quasi-random numbers and MO) | 2.2 A variance-reduction example
Noncentral Chi-Squared Probabilities -- Algorithms in R5 years ago
Introduction | Non-central 2 probabilities: History of R's pnchisq.c
Exact Decimal Rounding via Rationals6 years ago
Intro | Session information
Generalized Inverse Gaussian Archimedean Copulas6 years ago
1 Auxiliary functions | 2 Setup | Plot Kendall's tau as a function in $\theta$ for different $\nu$ | Parameter specification | 3 Sampling and estimation | Sampling | Estimation | 4 Plots | Profile likelihood plots | -log-likelihood plot | Wireframe | Levelplot
Computing Beta(a,b) for Large Arguments7 years ago
fast-specFGN8 years ago
.. intro .. | Better approximations using the Euler–Maclaurin formula | Session Information | Conclusion
The Copula GARCH Model9 years ago
1 Simulate data | 2 Fitting procedure based on the simulated data | 3 Simulate from the fitted time series model
Log-Likelihood Visualization for Archimedean Copulas9 years ago
Intro | Auxiliary functions | Joe's family | Easy case ($\tau=0.2$) | Harder case ($d=150$, $\tau=0.3$) | Even harder case ($d=180$, $\tau=0.4$) | Gumbel's family | Harder case ($d=150$, $\tau=0.6$) | Frank's family (an already hard case) | Session information
Nested Archimedean Lévy Copulas9 years ago
1 Auxiliary functions | Margins | (Nested) Clayton Lévy copula | Plotting | 2 Sampling paths | 4d positive Clayton Lévy copula | 4d positive nested Clayton Lévy copula
useR-2011-abstract13 years ago
Using expm in packages13 years ago
Introduction to the Matrix Package14 years ago
Introduction | Classes for dense matrices | Classes for sparse matrices