Questions tagged [marginal-model]

A marginal model estimates population averages, in contrast to a subject-specific model that estimates an expected value conditional on a subject's attributes. In a linear model context, these are the same, but they differ for nonlinear models. The GEE is the most salient marginal model.

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Interpretation of average marginal effects for categorical and continuous variables

I'd like to make sure I'm interpreting average marginal effects for categorical and continuous variables correctly (interpretation of binary variables seems straightforward). Using Stata, I ran a ...
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how to replicate the stata “margins, atmeans” command in R with the margins library [closed]

i'm trying to replicate the output of margins female, atmeans in R shown here: https://stats.idre.ucla.edu/stata/dae/using-margins-for-predicted-probabilities/ i ...
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Between subject effects with repeated measures?

I have some data with a repeated measures/replication problem, but I am not interested in within subject effects, but instead the overall effect. Can I control for this with either a mixed or marginal ...
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GEEs cannot analyze demographic variables but GLMMs can?

I thought I was coming to understand the difference between (binary) GLMMs and Marginal Models using GEE...until I encountered the following passage in Hosmer et al (2013: 328): The clear weakness ...
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188 views

How to estimate the margins distribution using ecdf?

Suppose we have a random variables x. x <- rnorm(500, 2,3) Suppose that we do not know the marginal distribution of (...
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Is there a concept of closure under marginalisation for space-time models

Consider a diagonal VAR(p) model for data at S spatial locations and T time points. The marginal model for the data at a subset of spatial locations is a lower dimensional diagonal VAR(p) model. So in ...
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120 views

How to control for repeated measurements without controlling for between-cluster variability?

I want to explore the effect of the average prenatal maternal stress (cortisol level, continuous measure) on offspring growth during a linear growth period (monthly body size measure, N = 17 infants, ...
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1answer
110 views

Trying to calculate industry averages for female employees

I have a dataset that lists employers in a particular industry, the number of employees they have and the breakdown of employees as male or female. I'm trying to get a number that reveals something ...
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1answer
247 views

Getting a 0 correlation for Poisson marginal model in geepack in R

I'm trying to replicate Table 13.8 from Fitzmaurice, Laird, & Ware (2011) using R for teaching purposes. This is a GEE count model of the number of bacteria on 30 patients at two waves. In their ...
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1answer
4k views

The difference between average and marginal treatment effect

I have been reading some papers, and I am unclear about the specific definitions of Average Treatment Effect (ATE), and Marginal Treatment Effect (MTE). Are they the same? According to Austin... A ...
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1answer
754 views

MIXED MODEL - can a fixed factor be continuous?

I am using the linear mixed function in SPSS and want to determine whether a continuous variable (attendance) has an effect on the repeated measurement of my DV (<...
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Does this analysis make sense and can references to similar work be provided? [duplicate]

I posted this question previously here, but did not receive any answers. I'm resurrecting this question in hopes that someone might be able to provide some feedback and/or references. Hopefully this ...
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1answer
263 views

GEE Logistic Model with Subject Specific Predictions?

I have fit a marginal logistic model or GEE Logistic Regression model using SAS' proc genmod to obtain estimated parameters associated with mortality (death). Using SAS, I am able to obtain subject-...
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Marginal model versus random-effects model – how to choose between them? An advice for a layman

In searching for any info about marginal model and random-effects model, and how to choose between them, I have found some info but it was more-or-less mathematical abstract explanation (like for ...
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1answer
4k views

Subject specific vs population average predictions

I am in doubt whether in my thesis I should report on the subject specific predictions of the probability to respond with an 'I don't know' answer, or the population average. Consider for example the ...
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Difference between marginal and conditional models

A marginal model accounts for the correlation within each cluster. A conditional model also takes into account the correlation within each cluster. My questions are: Does a marginal model models ...