Questions tagged [meta-regression]
A meta-analytic tool that examines the impact of moderator variables on studies' effect size. It is another name for mixed effects model in meta-analysis (moderators are fixed effects, studies are random effects).
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How to interpret meta-regression results with significant moderators but no significant overall effect?
I'm conducting a meta-analysis where I have a given set of studies, each with multiple effects (correlations in my case) I'm interested in. Each correlation coefficient answers a different research ...
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1answer
21 views
How does pooling affect variance?
Suppose you are looking at the prevalence of a certain disease and you can detect this disease in fecal samples. How does having a bunch of pooled fecal samples (i.e., taking a fecal sample from 5 ...
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46 views
What is the formula for combining Hedges' g across studies?
If I have Hedges g for a bunch of different studies, what is the formula for combining them?
EDIT with more detail. This is part of a meta-analysis. Each study was small, with N usually equal 6 or 8 ...
asked Dec 11 '19 at 19:08
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8 views
Moderator variable in meta-regression analysis and treatment effect heterogeneity
Meta-regression may reveal that variable A explains heterogeneity in pooled treatment effect of X.
In a clinical trial I can investigate whether there is interaction between treatment allocation and ...
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35 views
Pseudoreplication in studies used in meta-analysis (problem with sample size)
We are conducting a meta-analysis, but we have problems with pseudoreplication within our primary studies. Most of the studies use correlation analysis (but we also have linear regression and GLMM) ...
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17 views
Tau2 in random-effect multiple meta-regression
I'm doing random effect multiple meta-regression with two predictors and using method of moments to estimate between-studies variance (tau2). Tau2 formula for one predictor case is:
with F being:
Q -...
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1answer
23 views
Adding a covariate to a meta-regression with low sample size
In an meta-regression I am working on an interesting question has come up.
I am are running a meta-regression with 32 study sites. I have four theoretically motivated covariates I want to examine. ...
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1answer
28 views
Meta Regression- Average AGe
I want to conduct a meta-regression, using the variable.
The studies in my meta-analysis include studies, that compore two indipendent groups.
My question: to calculate average age of a study - is it ...
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0answers
49 views
Formulas for multivariate meta-regression
everyone!
I'm digging in meta-regression and doing hand calculations using WLS to get better understanding of the topic. I'm fine with calculations for univariative model (that is, 1 covariate is ...
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35 views
Can multilevel meta analysis be random-effects model and/or fixed effects model?
I am learning multilevel meta-analysis (or, three-level meta-analysis e.g., https://bookdown.org/MathiasHarrer/...
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1answer
53 views
model test p-value>0.05 but intrcpt <0.05 [closed]
Mixed-Effects Model (k = 21; tau^2 estimator: SJ)
tau^2 (estimated amount of residual heterogeneity): 0.2301 (SE = 0.0752)
tau (square root of estimated tau^2 value): 0.4797
I^2 (...
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2answers
89 views
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1answer
45 views
Help with meta-regression
I want to implement a meta-regression and require some assistance. Suppose that two univariate features ($X$ and $Y$) were measured from two samples $A$ and $B$ of size $N_A$ and $N_B$, respectively. ...
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1answer
47 views
interpreting meta regression results in R
I performed meta-regression in R and got the following results:
Mixed-Effects Model (k = 21; tau^2 estimator: ML)
...
3
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2answers
122 views
Is it possible to meta-analyze means on different scales?
I have study-level means/SDs reflecting depression symptom severity from multiple single-group studies. I do not have access to participant-level data. The studies all use different measures, and I ...
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0answers
54 views
meta-regression using metafor
How should I syntax the rma function from metafor package in order to get results in the following example?
My objective is to compare values (means) among species. I have different papers ...
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25 views
Meta-analyzing means/SDs from repeated-measures studies
I'm working on a meta analysis of prospective studies assessing changes to mental health in the year following an event. For the purposes of example, say it's the severity of depressive symptoms (...
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1answer
50 views
Meta-analyzing rates of change in one variable observed in one group over time
I'm working on a meta analysis of prospective studies assessing changes to mental health in the year following an event. For the purposes of example, say it's the prevalence of major depressive ...
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0answers
70 views
Regularization techniques (ridge, lasso or elastic-net regression) for meta-analysis
I was perusing the StatQuest YouTube channel, and serendipitously listened to a series of videos on regularization techniques (ridge, lasso or elastic-net regression).
It came to my mind that such ...
4
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1answer
101 views
Use of nested random terms in meta-analysis with a moderator
I am conducting a meta-analysis and I am struggling with the random structure when there is a continuous moderator and a nested random term. Starting with a simple example:
...
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1answer
77 views
Heterogeneity test in meta-analysis
In a random effect meta-analysis model with one categorical independent variable $\theta_{ij}=\theta_i+s_j+\epsilon_j$, where $\theta_{ij}$ is the observed effect size in category $i$ in study $j$, $\...
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33 views
Different estimates in multilevel meta-analysis for categorial moderator vs. subgroup analysis
I am conducting a three-level meta-analysis using metaSEM in R. I want to find out the mean effect size for four subgroups of my dataset and later I also want to use these groups as a moderator.
My ...
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1answer
28 views
How to differentiate through the optimization process in Model-Agnostic Meta-Learning?
I'm reading the paper introducing Model-Agnostic Meta-Learning (MAML).
As far as I understood, there is a nested optimization process in MAML. Given a task $\tau_i$ sampled from distribution $p(\tau)...
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1answer
166 views
Calculate sample variances from linear regression model for meta analysis?
I want to perform a meta analysis in two levels using linear regression in R (with lm() ).
I understand that in the second level I should perform a weighted ...
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62 views
How to meta-analyze three effect sizes of correlations?
I am searching statistical approaches to analyze three effect sizes of correlations. I would like to see the relationships among one independent variable (performance on a certain type of cognitive ...
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0answers
51 views
How can I perform bivariate random-effects meta-regression if the implied between-study covariance matrix is not positive definite?
I have described my problem here:
How can one get consistent (i.e. direct+indirect=total) effects in a Meta-Analytic SEM model with latent variables?
Unfortunately, the solution I've found to this ...
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2answers
152 views
Output of metafor for incidence rates
I need to clarify something and am hoping Wolfgang or someone else with expertise in the metafor R package could help.
I want to know what the output of the rma model (with a moderator in is for a ...
2
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1answer
55 views
Assessing normality assumption of effect sizes in meta-regression
I'm considering options for estimating tau-squared (the true between-study variance) in meta-regression, and I know method-of-moments (MM), unrestricted maximum likelihood (ML) and restricted maximum ...
3
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1answer
30 views
If someone wanted to do a meta analysis would they be able to use a publication that does not have p-values listed in the publication?
If someone wanted to do a meta analysis would they be able to use a publication that does not have p-values listed in the publication?
Does a meta analysis really need a publication to have a p-value?...
2
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1answer
82 views
Test whether effect size in meta-analysis is significant when controlling for moderator
I am using the metafor package to conduct a meta-analysis. I’d like to test whether the overall effect size is significantly different from zero when controlling ...
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0answers
42 views
Comparing predictions from multilevel meta-regression model
I'm using the metafor package in R to perform a multi-level meta-regression. I did not supply a variance-covariance matrix to the ...
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1answer
443 views
Moderator Analysis in meta-analysis in metafor package - conceptual questions [closed]
I am a beginner in statistics and currently have to conduct a meta-analysis in my lab. I am facing some difficulties to understand the meta-regression.
I read this webpage and tried to follow along:
...
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0answers
36 views
Is there a test error metric that takes into account variance of the data?
In standard machine learning applications, models are often evaluated based on metrics like RMSE or Deviance. I was wondering if there is a similar metric tailored towards meta-analyses that takes ...
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0answers
316 views
Diagnostic residuals for Beta GLMM weighted by sample size (Meta-analysis) using glmmTMB
I am conducting a GLMM for a meta-analysis using the beta distribution with the package glmmTMB. My response variable is a vector of correlations (No exact 0 or 1), but Fisher’s transformation fails ...
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1answer
157 views
Multiple categorical IVs in meta-regression
I'm running a meta-regression and am inputting at different study characteristics as IV's. The problem is some are continuous and some are categorical.
The IV's are:
Age
Gender (2 values, dummy coded)
...
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0answers
77 views
Effect size for meta-regression
I have conducted a hierarchical meta-regression, and the results revealed a large R2 with all predictors in the model, which is common in meta-regressions. Some of the non-significant results might be ...
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0answers
71 views
Why am I getting different means when conducting multilevel meta-analysis with factorial moderator vs. as subgroups?
I already asked about this in stackoverflow but maybe it fits better here.
I want to conduct a multilevel meta-analysis using metafor in R. I have effect sizes ("esid") nested within samples ("...
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0answers
722 views
Meta-analysis of proportions - how to analyze possible moderators and publication bias?
I am performing a meta-analysis study of proportions in Stata using the metaprop command. My data includes 10 studies for which I have the variables: ...
2
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1answer
309 views
Do I need to know correlations between dependent effect sizes for multilevel meta-analysis?
I am meta-analyzing with multiple effect sizes from each study.
The studies included in my meta-analysis measured the effects of participants REPEATDLY with MULTIPLE TESTS. I am trying to deal with ...
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1answer
28 views
Averaging ES from the same study in a MA
I'm completing a meta-analysis looking for an effect size for rates of forgetting for people with epilepsy vs controls.
I've already decided to separately extract effect size for the verbal and non ...
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0answers
21 views
How would I conduct a relative risk meta-analysis, when the exposure levels in the data are presented in overlapping ranges?
For example, if I have studies observing the dose-response relationship between alcohol (g/day) and breast cancer, and the exposures are reported as heterogeneous and overlapping ranges (10-20g, 15-...
2
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1answer
486 views
Easy post-hoc tests when meta-analyzing with the `metafor` package in r
I am conducting meta-analysis using metafor in R.
I would like to compare among 7 levels in a factor (i.e. different types of treatments).
...
4
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2answers
501 views
Step-wise Bayesian updating as a prior selection strategy
There is a famous principle in Bayesian that says: 'Yesterday’s posterior is today’s prior'. Lindley (2000).
Now, suppose there are three studies conducted chronologically. Based on Lindley's (2000) ...
2
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1answer
107 views
Is my full model with all significant estimates really the most parsimonious model?
I am performing a model selection based on BIC (Bayesian information criterion). I start with the following model fitted with rma.mv() in the 'metafor' package:
...
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1answer
57 views
Is it possible to do multiple regression on participants' level variables across studies using meta-analysis aggregated data? [closed]
I am wondering is it possible (or appropriate) to perform multiple regression using participants level variables across studies using meta-analysis data?
I know that usually, meta-regression is ...
1
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1answer
442 views
Meta-regression using rma from metafor, using DL random effects, with same effect for studies with same id
I would like to run a meta-regression on my dataset using DerSimonian-Laird (DL) random-effects model. For some studies in my dataset, I have more than one datapoint. Therefore, I would like to ...
2
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1answer
2k views
Interpreting meta-regression outputs from metafor package
I have been using the metafor package for some meta-analyses and would like to adjust for a single continuous covariate (mean age) using meta-regression. However, I require some clarification ...
3
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1answer
296 views
Logit transformation for a meta-analysis
I am in the final stages of a meta-regression on disease prevalence data and potentially associated covariates. I've entered the data as raw proportions and am using the logit transformed event rate ...
2
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1answer
474 views
Interpreting and plot interactions between continuous variables in rma.mv ('metafor') outputs
I was looking for ecologically-meaningful interactions in mixed-effects models of my meta-analysis when something nice (or at least I think!) came out.
My meta-analysis looks at plant diversity (i.e<...
2
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1answer
165 views
Underlying computing methods for meta-regression in the metafor package and the meta package
I was conducting a meta-analysis of single proportions(i.e. without a control group) and was trying to perform a meta-regression on a moderator in my data set (lable:modb) using two different R ...
