Questions tagged [dirichlet-regression]
The dirichlet-regression tag has no usage guidance.
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Significance of factors/regressors on compositional data
Let's assume that I have composite data, similar to the "ArcticLake" example dataset in the DirichletReg package in R. Now, I would like to know whether various numeric variables and factors ...
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Regressing time series of continuous proportions Y(invested in different buckets) against X (prices) variables
I am not sure of what model need to be applied in my case. So my goal is to model the below data.
I have the monthly deposits data from 2001 till 2024 for this analysis. Each customer can invest in ...
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Compositional data - interpreting Dirichlet regression with interactions
I did a Dirichlet Regression to assess the effect of independent variables on a compositional dependent variable. However, as I have 3 predictors, I do get interaction.
I have a hard time ...
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Results dirichlet regression - brms vs DirichelReg comparison
I am new to Dirichlet regression, but I am trying to understand why model outputs are potentially different when I use two different R packages, and how I could interpret the slope and intercept ...
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How do I compare explanatory power of Dirichlet regression with other models?
I have a dataset with 7 variables expressed in % of the total (i.e. one of the constraints is that sum of the variables = 100%).
I am looking at Dirichlet regression in R for the first time (I am ...
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Beta regression - simultaneously tracking all components so that proportions sum to 1.0
I am trying to fit a beta regression model in R with the outcome variable representing proportions, so that the model accounts for all of the constituents of the whole fraction. I am unclear how to ...
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Statistical analysis of compositional data - what test to use?
For one of my studies, I am playing with what seems to be a compositional data.
In short, I have some signal that I decompose in 4 frequency bands (B1 to B4) in a way that I get the relative ...
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645
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Dirichlet distribution with correlated components?
I am working with models that use Dirichlet distributions. However, I want to account for correlations between components. If this question is a duplicate, I'd also appreciate any pointers to the ...
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Computation of ratio with Dirichlet distribution
I would like to compute ratio of proportions coming from a Dirichlet distribution. My understanding is that each proportion should be treated as a random variable and therefore I should use Taylor ...
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Dirichlet for panel data: correlated random effects?
I was wondering whether I can apply a Dirichlet regression model to panel data (using either dirifit in Stata or DirichReg in R)?...
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How to fit a Dirichlet mixed effect model in R?
I have a compositional data from an arena experiment in which the duration of an animal in specific zones was denoted. The time in the arena was fixed for all individuals which makes the durations ...
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How does one Interpret a Dirichlet regression output?
I have been exploring the Dirichlet regression in R to analyze my ecological dataset and in the summary output is have several coefficient estimates. How do I interpret this output?
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How to deal with negative proportions in Dirichlet Regression
I am trying to work on a Dirichlet regression problem where I look at three true proportions the first two are actually measured while the third is computed as the complement:
$$p_3=1-p_1-p_2$$
The ...
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Restriction and dependence in the Dirichlet distributon
The Dirichlet distribution is sometimes said that it is "too restrictive and imposes strong conditions on the dependence between components". What is the reason?
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Compare dependent categories over time?
I have a dataset with 50 individuals. 25 are exposed to a substance on low concentration, 25 are exposed to a substance on high concentration over time.
I have 4 categories that represent different ...
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