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                <text>BAMBI: An R Package for Fitting Bivariate Angular Mixture Models</text>
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                <text>angular data, mixture models, bivariate data, von Mises distribution, wrapped&#13;
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                <text>Statistical analyses of directional or angular data have applications in a variety of&#13;
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more generally, multivariate) cases receiving more attention in recent years. More specifically, the bivariate wrapped normal, von Mises sine and von Mises cosine distributions,&#13;
and mixtures thereof, have been proposed for practical use. However, there is a lack of&#13;
software implementing these distributions and the associated inferential techniques. In&#13;
this article, we introduce BAMBI, an R package for analyzing bivariate (and univariate)&#13;
angular data. We implement random data generation, density evaluation, and computation of theoretical summary measures (variances and correlation coefficients) for the three&#13;
aforementioned bivariate angular distributions, as well as two univariate angular distributions: the univariate wrapped normal and the univariate von Mises distribution. The&#13;
major contribution of BAMBI to statistical computing is in providing Bayesian methods&#13;
for modeling angular data using finite mixtures of these distributions. We also provide&#13;
functions for visual and numerical diagnostics and Bayesian inference for the fitted models. In this article, we first provide a brief review of the distributions and techniques&#13;
used in BAMBI, then describe the capabilities of the package, and finally conclude with&#13;
demonstrations of mixture model fitting using BAMBI on the two real data sets included&#13;
in the package, one univariate and one bivariate</text>
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                <text>Fajar bagus W</text>
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                <text>Causal Effect Identification from Multiple Incomplete Data Sources: A General Search-Based Approach</text>
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                <text>Causal effect identification considers whether an interventional probability distribution&#13;
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criteria and procedures exist for many identification problems, there are still challenging&#13;
but important extensions that have not been considered in the literature such as combined transportability and selection bias, or multiple sources of selection bias. To tackle&#13;
these new settings, we present a search algorithm directly over the rules of do-calculus.&#13;
Due to the generality of do-calculus, the search is capable of taking more advanced datagenerating mechanisms into account along with an arbitrary type of both observational&#13;
and experimental source distributions. The search is enhanced via a heuristic and search&#13;
space reduction techniques. The approach, called do-search, is provably sound, and it is&#13;
complete with respect to identifiability problems that have been shown to be completely&#13;
characterized by do-calculus. When extended with additional rules, the search is capable of handling missing data problems as well. With the versatile search, we are able&#13;
to approach new problems for which no other algorithmic solutions exist. We perform a&#13;
systematic analysis of bivariate missing data problems and study causal inference under&#13;
case-control design. We also present the R package dosearch that provides an interface&#13;
for a C++ implementation of the search.</text>
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                <text>Santtu Tikka</text>
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                <text>https://www.jstatsoft.org/article/view/v099i05</text>
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                <text>University of Jyvaskyla</text>
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                <text> count longitudinal data, exact likelihood, Markov chain, marginal models, random&#13;
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                <text>This paper describes the R package cold for the analysis of count longitudinal data. In&#13;
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is via maximization of the exact likelihood and serial dependence among observations is&#13;
assumed to be of Markovian type and referred as the integer-valued autoregressive of&#13;
order one process. For random effects models adaptive Gaussian quadrature and Monte&#13;
Carlo methods are used to compute integrals whose dimension depends on the structure&#13;
of random effects. cold is written partly in R language, partly in Fortran 77, interfaced&#13;
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                <text>Model selection in mixed models based on the conditional distribution is appropriate&#13;
for many practical applications and has been a focus of recent statistical research. In&#13;
this paper we introduce the R package cAIC4 that allows for the computation of the&#13;
conditional Akaike information criterion (cAIC). Computation of the conditional AIC&#13;
needs to take into account the uncertainty of the random effects variance and is therefore&#13;
not straightforward. We introduce a fast and stable implementation for the calculation&#13;
of the cAIC for (generalized) linear mixed models estimated with lme4 and (generalized)&#13;
additive mixed models estimated with gamm4. Furthermore, cAIC4 offers a stepwise&#13;
function that allows for an automated stepwise selection scheme for mixed models based on&#13;
the cAIC. Examples of many possible applications are presented to illustrate the practical&#13;
impact and easy handling of the package.</text>
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                <text>Georg-August Universität Göttingen</text>
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                <text>Fajar Bagus W</text>
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                <text>D-STEM v2: A Software for Modeling Functional Spatio-Temporal Data</text>
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                <text>: functional data analysis, 4D data, climate data, environmetrics, EM algorithm</text>
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            <description>An account of the resource</description>
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                <text>Functional spatio-temporal data naturally arise in many environmental and climate applications where data are collected in a three-dimensional space over time. The MATLAB&#13;
D-STEM v1 software package was first introduced for modeling multivariate space-time&#13;
data and has been recently extended to D-STEM v2 to handle functional data indexed&#13;
across space and over time. This paper introduces the new modeling capabilities of DSTEM v2 as well as the complexity reduction techniques required when dealing with large&#13;
data sets. Model estimation, validation and dynamic kriging are demonstrated in two case&#13;
studies, one related to ground-level air quality data in Beijing, China, and the other one&#13;
related to atmospheric profile data collected globally through radio sounding</text>
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            <description>An entity primarily responsible for making the resource</description>
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                <text>Yaqiong Wang</text>
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            <description>A related resource from which the described resource is derived</description>
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              <elementText elementTextId="87940">
                <text>https://www.jstatsoft.org/article/view/v099i10</text>
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            <name>Publisher</name>
            <description>An entity responsible for making the resource available</description>
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                <text>Peking University</text>
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            <name>Date</name>
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                <text>August 2021</text>
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            <name>Contributor</name>
            <description>An entity responsible for making contributions to the resource</description>
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              <elementText elementTextId="87943">
                <text>Fajar bagus W</text>
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            <name>Format</name>
            <description>The file format, physical medium, or dimensions of the resource</description>
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            <description>A language of the resource</description>
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                <text>Inggris</text>
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                  <text>VOLUME 99 Tahun 2021</text>
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            <description>A name given to the resource</description>
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                <text>dynamichazard: Dynamic Hazard Models Using State Space Models</text>
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                <text>survival analysis, time-varying parameters, extended Kalman filter, EM algorithm,&#13;
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            <description>An account of the resource</description>
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                <text>The dynamichazard package implements state space models that can provide a computationally efficient way to model time-varying parameters in survival analysis. I cover the&#13;
models and some of the estimation methods implemented in dynamichazard, apply them&#13;
to a large data set, and perform a simulation study to illustrate the methods’ computation&#13;
time and performance. One of the methods is compared with other models implemented&#13;
in R which allow for left-truncation, right-censoring, time-varying covariates, and timevarying parameters.</text>
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                <text>Benjamin Christoffersen</text>
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            <description>A related resource from which the described resource is derived</description>
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                <text>https://www.jstatsoft.org/article/view/v099i07</text>
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            <description>An entity responsible for making the resource available</description>
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                <text>Fajar bagus W</text>
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                  <text>VOLUME 99 Tahun 2021</text>
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                <text>IncDTW: An R Package for Incremental Calculation of Dynamic Time Warping</text>
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                <text>: dynamic time warping, time series, k-NN, subsequence matching, distance measure,&#13;
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                <text>Dynamic time warping (DTW) is a popular distance measure for time series analysis&#13;
and has been applied in many research domains. This paper proposes the R package&#13;
IncDTW for the incremental calculation of DTW, and based on this principle IncDTW&#13;
also helps to classify or cluster time series, or perform subsequence matching and k-nearest&#13;
neighbor search. DTW can measure dissimilarity between two temporal sequences which&#13;
may vary in speed, with a major downside of high computational costs. Especially for&#13;
analyzing live data streams, subsequence matching or calculating pairwise distance matrices, runtime intensive computations are unfavorable or can even make the analysis&#13;
intractable. IncDTW tackles this problem by a vector-based implementation of the DTW&#13;
algorithm to reduce the space complexity from a quadratic to a linear level in number&#13;
of observations, and an incremental calculation of DTW for updating interim results to&#13;
reduce the runtime complexity for online applications.&#13;
We discuss the fundamental functionalities of IncDTW and apply the package to&#13;
classify multivariate live stream accelerometer time series for activity recognition. Finally,&#13;
comparative runtime experiments with various R and Python packages for various data&#13;
analysis tasks emphasize the broad applicability of IncDTW.</text>
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                <text>Maximilian Leodolter</text>
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                <text>https://www.jstatsoft.org/article/view/v099i09</text>
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                <text>Austrian Institute&#13;
of Technology</text>
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                <text>Fajar bagus W</text>
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                <text>The R package skpr provides a suite of functions to generate and evaluate experimental&#13;
designs. Package skpr generates D, I, Alias, A, E, T, and G-optimal designs, and supports&#13;
custom user-defined optimality criteria, N-level split-plot designs, mixture designs, and&#13;
design augmentation. Also included are a collection of analytic and Monte Carlo power&#13;
evaluation functions for normal, non-normal, random effects, and survival models, as well&#13;
as tools to plot fraction of design space plots and correlation maps. Additionally, skpr&#13;
includes a flexible framework for the user to perform custom power analyses with external&#13;
libraries and user-defined functions, as well as a graphical user interface that wraps most&#13;
of the functionality of the package in a point-and-click web application.</text>
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                <text>Regularization techniques such as the lasso (Tibshirani 1996) and elastic net (Zou and&#13;
Hastie 2005) can be used to improve regression model coefficient estimation and prediction&#13;
accuracy, as well as to perform variable selection. Ordinal regression models are widely&#13;
used in applications where the use of regularization could be beneficial; however, these&#13;
models are not included in many popular software packages for regularized regression. We&#13;
propose a coordinate descent algorithm to fit a broad class of ordinal regression models&#13;
with an elastic net penalty. Furthermore, we demonstrate that each model in this class&#13;
generalizes to a more flexible form, that can be used to model either ordered or unordered&#13;
categorical response data. We call this the elementwise link multinomial-ordinal class,&#13;
and it includes widely used models such as multinomial logistic regression (which also has&#13;
an ordinal form) and ordinal logistic regression (which also has an unordered multinomial&#13;
form). We introduce an elastic net penalty class that applies to either model form, and&#13;
additionally, this penalty can be used to shrink a non-ordinal model toward its ordinal&#13;
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                <text>University of&#13;
Wisconsin–Madison</text>
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                <text>The aim of this paper is to describe the implementation and to provide a tutorial for&#13;
the R package ssmrob, which is developed for robust estimation and inference in sample&#13;
selection and endogenous treatment models. The sample selectivity issue occurs in practice in various fields, when a non-random sample of a population is observed, i.e., when&#13;
observations are present according to some selection rule. It is well known that the classical estimators introduced by Heckman (1979) are very sensitive to small deviations from&#13;
the distributional assumptions (typically the normality assumption on the error terms).&#13;
Zhelonkin, Genton, and Ronchetti (2016) investigated the robustness properties of these&#13;
estimators and proposed robust alternatives to the estimator and the corresponding test.&#13;
We briefly discuss the robust approach and demonstrate its performance in practice by&#13;
providing several empirical examples. The package can be used both to produce a complete robust statistical analysis of these models which complements the classical one and&#13;
as a set of useful tools for exploratory data analysis. Specifically, robust estimators and&#13;
standard errors of the coefficients of both the selection and the regression equations are&#13;
provided together with a robust test of selectivity. The package therefore provides additional useful information to practitioners in different fields of applications by enhancing&#13;
their statistical analysis of these models.</text>
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                <text>https://www.jstatsoft.org/article/view/v099i04</text>
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                <text>Fajar bagus W</text>
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