Multilevel data in brms distributional models with smooth terms (splines)

This short entry summarizes what I found (and learned) about using smooth terms (splines) within brms mixed-models fitted with the brms R-package and a zero-one-inflated beta family (zoib) and, about the importance of modelling sigma in these cases. The main reference to this entry was found in Estimating Distributional Models with brms (Paul Bürkner, 2023) …

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Install CmdStan for R in Windows

Assuming that Rtools is already installed, these are the steps to install cmdstanr from RStudio in Windows 10: install.packages(«devtools») devtools::install_github(«stan-dev/cmdstanr») library(cmdstanr) This is cmdstanr version 0.5.3 – CmdStanR documentation and vignettes: mc-stan.org/cmdstanr – CmdStan path: C:/Users/tonis/Documents/.cmdstan/cmdstan-2.30.0 – CmdStan version: 2.30.0 A newer version of CmdStan is available. See ?install_cmdstan() to install it. To disable this …

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DAGitty — draw and analyze causal diagrams

Visit this site to create causal diagrams online or in R. DAGitty is a browser-based environment for creating, editing, and analyzing causal diagrams (also known as directed acyclic graphs or causal Bayesian networks). The focus is on the use of causal diagrams for minimizing bias in empirical studies in epidemiology and other disciplines. For background …

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Worth reading: Is this the future of assessment? (Christodoulou, D., 2022)

Another interesting «worth to read» piece is found in TES magazine with the title: «Is this the future of assessment?».  The author is Daisy Christodoulou and she introduces the topic as follows: Calls for exams to be scrapped have grown louder in the wake of the Covid-19 pandemic. But rather than getting rid of exams, …

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Worth reading: A Critical Perspective on Effect Sizes (Quentin A., 2022)

Effect sizes (ES) are usually required by journal editors to help readers to better understand research outcomes. However, ES should be understood and, when reported, researcher must provide not only which ES metric is used (Hedge’s g, Cohen’s d, and the Glass Δ,  η2 and ηp2 …) but also additional information such as sample sizes and statistical …

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Covid-19: Cuarentena día 6. La situación de hoy en España

El post de hoy es un gráfico que muestra la tasa de infectados por cada 100.000 habitantes en las comunidades autónomas (regiones) de España: Se aprecia que La Rioja (1ª) y Navarra (3ª) comparten con Madrid (2ª) las tres primeras posiciones a pesar de que de las dos primeras apenas se habla. Las dos líneas …

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Covid-19: Cuarentena día 4. Dr. Tedros, la PCR y los datos de Italia.

En este segundo post que escribo en el 4ª día de cuarentena (leer aquí el primero) hablaré de tres asuntos  relacionados con la pandemia #Covid-19. Queda para una próxima entrada seguir analizando las herramientas para ofrecer soporte y feedback educativo online sobre las que ya hablé en el post anterior. Covid-19 El Lunes, 16 de …

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