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#statstab #478 Stuck between Zero and One: Modelling Non-Count Proportions with Beta and Dirichlet Regression

Thoughts: A few resources for proportion data.

#Dirichlet #proportions #betareg #count #tutorial

https://methodsblog.com/2019/08/06/beta-dirichlet-regression_en/

Stuck between Zero and One: Modelling Non-Count Proportions with Beta and Dirichlet Regression

Post provided by JAMES WEEDON & BOB DOUMA Chinese translation provided by Zishen Wang 這篇博客文章也有中文版 Imagine the scene: you’re presenting your exciting research results at an important internation…

Methods Blog

#statstab #477 Simulating data for Dirichlet regression with varying estimates

Thoughts: Interesting thread about an underused model.

#Dirichlet #brms #poweranalysis #rstats #proportions #stan #forum

https://discourse.mc-stan.org/t/simulating-data-for-dirichlet-regression-with-varying-estimates/35325

Simulating data for Dirichlet regression with varying estimates

Hello everyone, The shortest formulation of my problem is the following: I’m trying to design a power analysis by simulation for a Dirichlet regression model using brms. How could we calculate the shape parameter alpha of the Dirichlet distribution by hand from a theoretical model in order to feed it to brms::rdirichlet(n, alpha) to simulate data with chosen effects? The goal is to tweak manually the coefficients of the model to simulate data with varying effect sizes. Now for the lengthier c...

The Stan Forums

#statstab #439 {ZOID}

Thoughts: "zero-and-one inflated Dirichlet regression (also known as trinomial mixture models) in a Bayesian framework (Stan)"
Useful for composite proportions.

#Dirichlet #bayesian #stan #r #rstats #proportions

https://noaa-nwfsc.github.io/zoid/index.html

Bayesian Zero-and-One Inflated Dirichlet Regression Modelling

Fits Dirichlet regression and zero-and-one inflated Dirichlet regression with Bayesian methods implemented in Stan. These models are sometimes referred to as trinomial mixture models; covariates and overdispersion can optionally be included.

#statstab #435 Guide to understanding the intuition behind the Dirichlet distribution

Thoughts: Useful for composite proportions, but take ages in brms.

#brms #Dirichlet #proportions #modelling #rstats #r #betareg

https://www.andrewheiss.com/blog/2023/09/18/understanding-dirichlet-beta-intuition/

Guide to understanding the intuition behind the Dirichlet distribution | Andrew Heiss

Learn about the Dirichlet distribution and explore how it’s just a fancier version of the Beta distribution

Andrew Heiss