# Tagged Questions

Cohen's d is a generalized effect size measure. It is the difference between two group means scaled by the combined standard deviation. Cohen's d is used frequently in Jacob Cohen's text on power analysis, mostly to simplify the presentation of tables.

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### Calculating Standardized Response Mean

I was told that standardized response mean was calculated as "absolute mean change divided by the standard deviation of individuals’ change in score." But, other websites say "the difference between ...
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### How do I work out wether a cohens d effect size is significant?

I'm currently doing a meta analysis where I have to convert the results to a cohens d. I obviously have different samples/ tests including paired samples and odds ratio for example. I'm wanting to ...
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### Help with choosing the correct effect size

I conducted a two-way between groups ANOVA to test the impact of video gaming (gamer/non-gamer) and gender (male/female) on reaction time. I'm conducted my analysis using SPSS and received the ...
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### Cohen's d in pre-post meta analysis based on means and SD

As follow up on this question:I want to incooporate studies using different continues outcome in a meta analysis using SMD. I am following this guide and I do not fully understand how to calculate the ...
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### How to treat cohen's d Infinites/NaNs calculated using binary proportions for metanalysis

I am trying to do a metanalysis (using Wilson meta-analysis http://mason.gmu.edu/~dwilsonb/ma.html) comparing the dropout percentage of a treatment with a control group. I tried to calculate the cohen'...
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### Pearson's r and Cohen's d

I am analyzing the relationship between 3 variables (identification rate (ID) of students with disabilities, per pupil expenditures (PPE), and graduation rate (GR)) in the following format: 1. ID - ...
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### Can I extrapolate a mean difference from the t-statistic?

I have the t-statistic, df, p and cohen's d for the one-tailed independent samples t-tests on the difference between a parameter for cases and controls. I would like to obtain a mean difference and ...
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### Do Cohen's d and Hedges' g apply to the Welch t-test?

How do you go about calculating effect size for the Welch t-test?
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### How to calculate pre and post treatment Hedge's g effect size to use in meta-analysis of studies with no control group?

How to calculate pre and post treatment Hedge's g effect size to use in a meta-analysis for studies with no control group? Can you do it with just pre and post treatment means and standard deviations ...
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### How to calculate cohen's d (and CI) for survey data

I am working with the TIMMS and PIRLS data. Both data sets use a Jackknife repeated replication design. Both data sets also use 5 plausible values for each student's grade (5 values with different ...
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### Cohen d for 2x2 interaction

There is a nice answer to this question, but it assumes that you have the ANOVA table available. My problem is different. Say I'm reading a paper describing a male vs female, disease vs control ...