# All Questions

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42 views

### Meta-analyzing ICCs to avoid using multiple random effects?

(Note: Parts where I've encountered problems are in bold to make them easily findable.) I have data from a longitudinal study of twins. Several biomarkers are measured, usually 4 measurements each (...
23 views

### d to r conversion for extremely high versus extremely low groups

Context Suppose I am performing a meta-analysis on the relationship between two variables (say depression and life satisfaction). Unfortunately, many studies in the prior literature do not report ...
38 views

### Questions about standard error

We are trying to create a table of standardised effects and standardised errors to compute for a meta-analysis. And I had a few questions around this Can you get a standard error for pearson ...
70 views

### Network meta-analysis of correlation coefficients: a logical paradox?

A colleague of mine wishes to conduct a network meta-analysis of correlation coefficients for a set of imaging tests (eg ultrasound, computed tomography, magnetic resonance imaging, and so forth). ...
44 views

### Correlation meta-analysis of multiple paired mean data sets

I'm aware that it isn't possible to calculate a correlation coefficient from the means of two data sets. However, I'm wondering if there is a way to get a correlation coefficient (with confidence ...
67 views

### Is it possible to calculate an average correlation of r from several correlations of r? [duplicate]

Any help would be appreciated. I have a table presenting multiple r correlations between various formats of the same test and the construct/dimensions it purports to measure. Is there an acceptable ...
20 views

### correlation co-efficient meta analysis

I am conducting a correlation co-efficient meta analysis. I understand that this involves collection of effect sizes from various data presented in numerous studies. I am wondering What other data ...
20 views

### Correlational Meta-analysis

I conducted a correlational meta-analysis. There were three groups of behaviours and one aggregate effect size for the correlation between each behaviour group and a continuous measure. We used ...
493 views

### meta-analysis of Spearman correlation coefficients?

I have Spearman correlation coefficients (and sample sizes) from several studies and I want to meta-analyze them. Is it OK to do this using general-purpose meta-analysis software, or is it not OK ...
587 views

### Correlation in meta analysis

I am conducting a meta-analysis, and the main question is: "Is there a relationship between corrected angle and the functional outcome?" I have some studies that report the corrected angle and ...
2k views

### How to perform a meta-analysis of regression coefficients?

I want to perform a meta-analysis but the included studies use different models to analyze the data. There are Pearson correlation (3 studies), Spearman correlation (1 study) and several studies (~7-...
763 views

### How to calculate a composite score from correlations in a meta-analysis

I am conducting a meta-analysis on safety culture (predictor) and safety performance (outcome). In some studies that I am coding, they presented the correlations between the subscales of safety ...
59 views

### Corrected intercorrelations knowing sample size and variable reliabilities

I have a list of studies from a meta-analysis. The studies list the correlations between two variables (scales, and their reliabilities - alphas), and the N. I am looking to make these correlations ...
551 views

### Independent measures for pre-post data

In conducting a meta-analysis, I have pre-post data from single case designs. Unfortunately, I do not have access to the correlations between the pre and post scores. Is it correct that if I ...
278 views

### Within subject effect size when no correlation available

I am doing a research project on the topic of replicability in psychology. To do this, I did a set of 10 meta-analysis on different studies. My problem is the following : some of those studies were ...
389 views

### Meta-analysis: How can I compute the sampling variance of Fisher's z-transformed correlation coefficients for within-subject designs?

Rosenthal and colleagues (Rosenthal, Rosnow & Rubin, 2000) suggest that it is possible to compute r (correlation coefficient) as an effect size from repeated measures designs (e.g., by converting ...
99 views

### Correlational meta-analysis and moderators

I have 3 correlations between A and B through 3 different studies : ...
2k views

### How do I convert $\eta^2$ to Pearson's r?

I am doing a meta-analysis of associations between sets of variables that are essentially all continuous. However, many studies operationalised them at 'lower' levels, and I have (converted to) most ...
427 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 $g_2$, ...
380 views

### Calculating the correlation between difference scores from the correlations within timepoints

For a meta-analysis I am conducting, I need to know the correlation between two sets of difference scores. For example, imagine a study in which the researchers measure variables $x$ and $y$ at time ...
264 views

### How to best analyze these data?

I'm trying to figure out a way to analyze these data that I have: These are data that I pulled from various studies, and each study has a different sample size, and each study reported an ...
431 views

### How to do meta-analysis and create forest plots using Beta correlation coefficients

Does anyone knows how to do meta-analysis and create forest plots using beta-correlation coefficients?
314 views

### Whether to apply structural equation modelling separately to each of a set of heterogeneous correlation matrices in a meta-analysis context?

I'm in the process of performing an Structural Equation Modelling (SEM) meta-analysis on some psychological data. Ultimately I want to examine a mediational model based on a set of correlation ...
4k views

### Does transformation of r into Fisher z benefit a meta-analysis?

Usually $r$ is transformed into Fisher $z$ to test difference between two $r$ values. But, when a meta-analysis is to be performed, why we should take such a step? Does it correct for measurement ...
1k views

### When to use correlation as effect size when performing meta-analysis with diverse predictors?

I am a PhD student and am conducting a literature review on musculoskeletal physiotherapy and am struggling to get guidance on this subject as most health researchers conduct meta-analyses of ...
306 views

### Listing of typical correlations across spectrum of topics and disciplines to assist with teaching meaning of correlation coefficient

Context When I teach students about the correlation coefficient, I like to give students a sense of how correlations map on to common associations that might be encountered in daily life and across ...
Assume: A previous study looking at the relationship between $X$ and $Y$ obtained a correlation of $r = 0.50$ using a sample of $n = 100$. The raw data is not available. The current study also ...