Meta-analysis refers to methods focused on contrasting and combining results from different studies, in the hope of identifying patterns among study results, sources of disagreement among those results, or other interesting relationships that may come to light in the context of multiple studies.

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Parallel SAS computing in HPC cluster [migrated]

I am working in the simulation of a nested meta-analysis model through a HPC cluster. For doing this, I use SAS under UNIX environment and I am trying to run in parallel the following code that I ...
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29 views

Most appropriate way to construct overlapping dummies

What would be the most appropriate way to construct dummies with theoretical overlap? I'm doing a meta-regression of studies looking at the effect of certain interventions on X. Some studies use ...
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How do I calculate the variance of a mean difference effect size that has been converted to Fisher's z for meta-analysis?

To be able to compare different types of effect sizes, I am converting my effect sizes that are originally mean differences into correlation coefficients. I am using the following formula: d <- (t ...
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23 views

Meta-analysis in R using SE and weights based on number of years of the experiments

I have a dataset with this format, containing different experiments and mean and SE values for two treatments (amb and elev), to ...
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7 views

Variable selection algorithm based on meta study

Suppose I would like to conduct a survey and want to know which variables to include. Literature review and theoretical guidance both help. What I would like to know is whether there is a way to do a ...
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21 views

Meta-analysis statistics required

I need to know the appropriate statistic to use in a meta-analysis. I want to compare the effect size for three hypotheses - that there are significant groups differences firstly between treatment ...
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69 views

Meta-analysis in R with standard errors instead of standard deviations {metafor}

This is the formula I would need to use to perform a meta-analysis in R using the package metafor: ...
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19 views

Calculating effect sizes without SDs or sample sizes for meta-analysis

I'm coding articles for a meta-analysis looking at group differences on dichotomous and continuous outcomes. Groups are not the same size. Continuous outcome ES is standardized mean difference and ...
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71 views

Meta-analysis: is there a way of including dependent effect sizes without averaging across them

I'm running a meta-analysis with a binary outcome (succeed/fail). I am primarily interested on the effect of predictors related to the study (e.g. age of participants, type of task) on the binary ...
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45 views

Will this invalidate my meta-analysis

I am pooling scores for my meta-analysis. The outcome measure is the proportion of children that pass a task. The data reported is given in three ways: 1) When children are tested with the task ...
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33 views

How do I statistically test whether two intervention types have significantly different effects in a meta-analysis?

I have the following problem: I am researching the difference in effects (as measured by standarized mean differences (SMD)) of two intervention types. (let's call them intervention 1 and intervention ...
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1answer
42 views

What type of meta-analysis do i need here?

I'm looking for the name of a statistical technique that can perform the following analysis for me. I want to do a regression looking at the effect of the mean of age of a sample, predicting the ...
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28 views

Help with Comprehensivie Meta-Analysis: Running multiple outcomes and moderators

I need help making sure that I run the analyses correctly in Comprehensive Meta-Analysis. I am running a meta-analysis with six different outcome measures based on theoretical reasons and delineation ...
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23 views

Test for homogeneity in meta-analysis with a large number of studies

So I am conducting some literature searches on behalf of someone. I stumbled across a meta-analysis which used 23 studies. It tested the homogeneity of the studies used, using what I think is a ...
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29 views

Separate levels of an outcome measure reported, but the means and SDs do not add up to the “total items,” why?

I am working on a meta-analysis that distinguishes achievement on two levels: content acquisition (e.g. knowledge and comprehension) and skills application (e.g. problem solving, etc.). I came across ...
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14 views

Outcome Results - Mean Change & Standard Error - Missing Standard Deviation

The results of a clinical trial are given as "Mean Change", together with a "Standard Error", also the "Mean Differences" of the Intervention and Control are given, together with 95% Confidence ...
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2answers
27 views

Dealing with studies with no cases in meta-analysis

I am meta-analysising the following data by age range: ...
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1answer
28 views

Comparing rates of success in paired groups of samples

I have $2n$ paired populations, on which I measure a rate of success, let's say $(r_{group}^i)_{group \in (0,1)}^{i \in[1,n]}$ where $r_0^i$ and $r_1^i$ are the rates of success in the $i$-th pair of ...
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33 views

multiple hypothesis correction for meta-analysis with missing p-values

I would like to combine multiple p-values (e.g., using Fisher or Stouffer), where some hypotheses may have missing p-values across studies. e.g., ...
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14 views

Comparing effect sizes of two treatments from a large number of studies

I suppose this would be some kind of meta-analysis. I would like to compare the effect sizes of two treatments from a large number of published studies. I would like to show that the other treatment ...
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25 views

Averaging effect sizes?

Suppose I need an estimate of effect size for a power analysis. I read the relevant literature and calculated Cohen's $d$ from some number (3) of studies. If the Cohen's $d$s are, for example, $d_{1} ...
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75 views

Change scores as outcome measurements in clinical trials

I am performing a Meta-Analysis about a mental disease, comparing intervention vs. control groups and try to extract outcome results from published study papers. In some clinical randomised trials ...
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53 views

Meta-Analysis Data Extraction Process - Reporting of Outcome Measures

I am conducting a Meta-Analysis of a clinical intervention in randomised trials. I am using the RevMan Software of the Cochrane Foundation. The problem regards the extraction process of relevant ...
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109 views

Torn between PET-PEESE and multilevel approaches to meta-analysis: is there a happy medium?

I am currently working on a meta-analysis, for which I need to analyze multiple effect sizes nested within samples. I am partial to Cheung's (2014) three-level meta-analysis approach to meta-analyzing ...
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60 views

Discrepancy between metafor and weighted lm() standard errors

My friend and I are trying to understand why a weighted lm() v. a fixed-effect rma model from the ...
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46 views

Heterogeneity measures when pooling meta-analyses: what assumptions do we make?

I am looking at the possibilities and limitations of meta-meta-analysis (MMA), put differently, pooling the results of multiple meta-analysis. I realise that it is better to include primary studies, ...
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85 views

Computing Paired Samples (pre/post) Effect Size with Limited Information

I'm conducting a meta-analysis using the Hedge's g effect size statistic. Many of the studies are only reporting: pre-treatment mean score pre-treatment standard deviation post-treatment mean score ...
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Relation between variance stabilizing transformations and effect sizes?

When researching effect size for proportions, in particular the paper Effect-Size Indices for Dichotomized Outcomes in Meta-Analysis, that at least two of the usual effect sizes are realy variance ...
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48 views

Resources for understanding meta-regression?

I'd like to learn more about the statistical techniques that one should use for a meta-regression. I'm interested in both general theory, as well as examining methodologies in R.
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17 views

Meta analysis; significance test of correlations

I have performed a meta analysis using the 'Metafor' package in R. I have some corrected correlations. Now I am wondering how I can calculate whether they are significant and whether there is a ...
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25 views

Publication bias in meta-analysis of single observation studies

I have conducted a systematic review and lme model of 50 studies attempting to economically value ecological services (previously un-valued). These studies do not use data samples or observations, ...
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81 views

Calculating effect size (lnR) variances for studies with different study designs for use in meta-analysis

My question concerns the calculation of effect size variance for studies that are going to be included in a meta-analysis. I want to calculate variance so that I can weight each study by the inverse ...
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1answer
69 views

Meta-regression of utility weights (hierarchical linear model)

I would like to perform a meta-regression of utility weights for two health states (1st state - overall, with specific condition; the second - with additional conditions, comorbidities). Some ...
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50 views

Meta-analysis - Multiple Outcome measures for the same population

Basically, I am trying to include some binary data into a meta-analysis and not sure how to include this dataset. If you look at the attached table, each red square that i drew depicts an ...
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45 views

Hartung-Knapp CIs in meta-analysis with two trials

I'm having trouble convincing my collaborators that we should use the Hartung-Knapp correction when we have only two trials. This paper seems pretty convincing ...
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70 views

meta analysis of odds ratios

I would like to work on a meta analysis project, I have kept 8 studies that satisfy my criteria and I'd like to continue with these. Their results are formed as odds ratios (OR) and confidence ...
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35 views

Transformation of means and sd in meta-analysis

I am doing a meta-analysis based on the means and standard deviations collected from many other studies. The distribution of the data indicated that I need to transform the data. However, the authors ...
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35 views

Meta-analysis of skewed data with low event rate (single-arm studies)

I am trying to pool the data from several single-arm studies regarding the re-infection rate of a certain disease using STATA. From each study, I have obtained the no. of re-infections, and the ...
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103 views

Is it valid to use a generalized model with no replicates

I've got a designed experiment that is a long-term agricultural station. The field is divided into 11 rows and 6 columns (each column has two sub-columns). Each resulting plot represents a unique ...
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Meta-analysis: Difference between direct and indirect restriction of range

Looking at meta-analysis for personnel selection procedures, I am having really big troubles to figure out the difference between concepts of direct restriction of range (DRR) and indirect restriction ...
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72 views

Metafor package in R: Ranktest for multivariate meta analysis

I have done a multivariate meta analysis with R, with support from metafor package. I am using rma.mv-method which gives an R object of class c("rma.mv","rma"). My question is about looking for funnel ...
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129 views

R-Metafor: Meta-analysis and mixed effect model

This is an example of my dataset ...
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36 views

What are the quantitative methods alternative to Meta-Analysis?

What are the alternative statistical quantitative synthesis methods for combining studies, if we can't apply meta-analysis because of the heteronegeity or the shape of the data, for the data set of ...
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56 views

Which method should I use to combine the data of my studies?

I want to make a meta-analysis on household consumption expenditures elasticity data. In these studies that I've got; methods and regions and etc. varies according to studies. But at last, the results ...
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58 views

Meta analysis of multiple-treatment-multiple-endpoint studies

I have read some things about Meta Analyses for stochastically dependent effect size (e.g. Gleser and Olkin (2009) in The handbook of research synthesis and meta-analysis (2nd ed.). I understood ...
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25 views

Alternatives to Fisher's method?

I'm using the Mann-Whitney U test to compare scores from a foreground (n ranging between 5-500) to a large background (up to 2000). Since my foreground is quite small I've been taking smaller random ...
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42 views

Estimate an overall correlation from the correlations within subgroups

Assume that you are working with variables $x$ and $y$ divided into groups two groups, $g_1$ and $g_2$. You know the following information: The number of people within groups $g_1$ and $g_2$, ...
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1answer
59 views

User weights in metafor

While reading "Conducting Meta-Analyses in R with the metafor Package" (http://www.jstatsoft.org/v36/i03/paper), I am wondering how model fitting works with user defined weights. In chapter 2.4 is ...
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1answer
119 views

Converting Adjusted Odds Ratios to its RR counterpart

I am doing a meta-analysis of studies which reported their estimates sometimes as OR and sometimes as RR. I wanted to convert the OR to RR, so that I can pool them together. I know that I can use this ...