Linked Questions

0
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0answers
65 views

how do I calculate effect size for data based on Wilcoxon signed ranks test [duplicate]

How do I calculate effect size for data based on Wilcoxon signed ranks test. Any step-by-step guidelines? What software should I use?
8
votes
2answers
85k views

How to report effect size measures r and r-squared and what is a non-technical explanation of them?

If $r$ is the effect size for the correlation between $A$ and $B$, then $r^2$ is the amount of variance in $B$ that can be attributed to variable $A$. Is it important to report both indexes in a ...
8
votes
3answers
9k views

How to correct for small p-value due to very large sample size

I am running into a problem where an independent variable, which should have no predictive power on the dependent variable based on domain knowledge, comes out with very small p-value because the ...
5
votes
3answers
2k views

Effect size for Wilcoxon signed rank test that incorporates the possible range of the attribute

I'm currently working on my master thesis and I'm analysing attributes obtained from digital elevation models (DEMs). I try to compare two point sets for which I extracted altitude values from two DEM ...
1
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2answers
2k views

How do you calculate the effect size of one-sample Wilcoxon signed-rank test?

Can you / how do you calculate the effect of a one-sample Wilcoxon signed-rank test? Is there a way to perform the calculation in SPSS or another software package?
0
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0answers
2k views

Non-parametric effect size: probability of superiority?

Here it is suggested to use the Hodges-Lehmann estimator. However, I have just read (source) that this estimator is not reliable for skewed distributions. This is the case for the data I have - I know ...
0
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0answers
1k views

teststatistic vs linearstatistic in wilcoxsign_test

In R, wilcoxsign_test in library coin calculates both a "teststatistic" (output as "Z") and a "linearstatistic" (I think this is ...
2
votes
1answer
775 views

Effect size and standard error for Mann-Whitney U statistic

I'm conducting a meta-analysis and one of the studies only reports Mann-Whitney $U$ statistic. The table with results is pasted below. Circled in red is the $U$ statistic that tests the differences ...
2
votes
0answers
741 views

Is it possible to calculate cohen's d from nonparametric statistics?

I am working on my thesis and my supervisor wanted me to calculate cohen's d for my significant results. I am using SPSS and I was able to calculate Cohen's d using an external site. My independent ...
1
vote
1answer
573 views

Calculating effect size + 95 CIs for median differences (SPSS)

I've got a mixture of parametric and non-parametric data, with a repeated measures design; measuring animal behaviour in three different treatments. For parametric data, it's simple enough calculating ...
1
vote
1answer
471 views

What to do with a very big sample size? (effect size) [duplicate]

We have a peculiar problem, for which we have many questions, but cannot seem to find satisfactory answers (we did find a few ideas as to what to do, but we are not very certain they apply to our ...
1
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0answers
121 views

Effect size estimation for nonpar-test. Does anybody know the mathematical derivation of r=z/sqrt(N) ? (Rosenthal 1991)

In order to calculate an effect size estimator for a non-parametric test such as the Wilcoxon test, the following formula is applied: $ r= \frac{Z}{\sqrt{N}} $ This formula is suggested by several ...