# Questions tagged [heterogeneity]

Use this tag for questions in the context of meta-analysis; use [heteroscedasticity] in the context of regression modeling. Heterogeneity arises when the primary studies are not drawn from a single population.

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### Measuring treatment heterogeneity

This follows on a first question posted here I am looking at the effect of information on local prices and choices to move to certain cities. I think that this information will have a positive effect ...
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1 vote
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### Constructing subgroup comparisons for variable selection

I am trying to construct a covariate according to the the following description: When constructing the covariates to measure a subgroup effect, we generate covariates that capture the causal effect ...
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### How to model heterogenenous count data?

I have been trying different models to model highly variable count data (mean 8.5, variance 144.3), that is grouped by participant (each participant took between 4 and 16 tests). Within each ...
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### I2 (I-squared) estimates for heterogeneity of independent meta-analysis versus a single meta-regression

I am wondering how the I2 estimates of independent meta-analyses per level of a categorical moderator compare to those of a single meta-regression. The question is similar to the one about how the ...
78 views

### meta-analysis: expected Q and observed Q

I understand the equation for observed $Q$: $$\Large Q = \sum_{i=1}^k \frac{1}{V_i} (Y_i - M)^2$$ But I don't understand why the expected $Q$ is just the degrees of freedom ($k - 1$), where $k$ is ...
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### Marginal Treatment Effects using MTEFE - postestimation discrepancy

I am currently calculating Marginal Treatment Effects for an outcome Y (earnings) and a treatment D (joining sector 1 vs sector 0), using the MTEFE package from Stata. I use a separate approach with a ...
52 views

### Testing publication bias and heterogeneity in meta-analysis when using multiple studies

I am conducting a meta-analysis and I'm trying to ascertain how to test for publication bias and heterogeneity. However, I have used multiple datasets to calculate effect sizes, and therefore I'm ...
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### How to interpret predicted intraindividual variance (residual variance)? [duplicate]

Background I'm working on a project on modeling/understanding the intraindividual variance of a repeat measurement. To do this, I'm following a tutorial set out by Dr. Nilam Ram that can be found here ...
1 vote
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### How to choose between different estimators for tau in meta-analysis?

The question is relatively simple although it may won't be possible to answer at all. In meta-analysis using random-effect model, we can choose between several different methods for estimating tau (e....
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