Tag: R
Un-debunking the GAMLSS myth
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Generalized additive models for location, scale, and shape (GAMLSS) are popular for estimating reference equations, e.g., for lung function measurements. A recent paper claimed to 'debunk' the GAMLSS myth in this context by showing that much simpler piecewise linear models work just as well. A new letter to the editor refutes these claims. Read more ›
Remembering Friedrich "Fritz" Leisch
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Our friend and colleague Fritz Leisch died in April last year. In a new contribution to The R Journal we honor Fritz and commemorate his many contributions to science in general and to the R community in particular. Read more ›
Examining exams using Rasch models and assessment of measurement invariance
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Models from psychometric item response theory are used to analyze the results from a large introductory mathematics exams in order to gain insights about student abilities, question difficulties, and heterogeneities of these in subgroups. Read more ›
Modeling loss aversion with extended-support beta regression
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The recently-proposed extended-support beta regression model in R package betareg is illustrated by simultaneously modeling the occurrence and extent of loss aversion in a behavioral economics experiment. Read more ›
Extended-support beta regression for [0, 1] responses
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New arXiv working paper introducing extended-support beta regression models which can capture probabilities for boundary observations at 0 and/or 1. It is available in the latest R package betareg, also accompanied by a new altdoc web page. Read more ›
Subgroup detection in linear growth curve models
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New arXiv working paper showing how generalized linear mixed effects model (GLMM) trees, along with their R implementation in the glmertree package, can be used to identify subgroups with differently shaped trajectories in linear growth curve models. Read more ›
Tree models for assessing covariate-dependent method agreement
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New arXiv working paper introducing conditional method agreement trees (COAT) which can capture the dependency of a Bland-Altman analysis on covariates. It is ccompanied by an R implementation in the CRAN package coat. Read more ›
CRAN Task Views: The next generation
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New arXiv working paper on the relaunch of the CRAN Task View Initiative providing better infrastructure and workflows for proposing and maintaining CRAN Task Views and fostering interactions with the R community. Read more ›
Color vision deficiency emulation fixed in colorspace 2.1-0
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The color vision deficiency emulation provided by R package colorspace was inaccurate for some highly-saturated colors due to a bug that was fixed in version 2.1-0. The (typically small) differences are illustrated for a range of palettes. Read more ›
Coloring in R's blind spot
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New arXiv working paper on the new color palette functions palette.colors() and hcl.colors() in base R since version 4.0.0. Read more ›