All Questions
Tagged with wilcoxon-signed-rank effect-size
11
questions
5
votes
1
answer
183
views
Calculation of standard deviation of the mean changes from the p-value or z-value of the Wilcoxon test
I am conducting a meta-analysis of observational studies without a control group that compared a parameter's value before and after an operation. All included studies have reported their results as ...
- 63
0
votes
1
answer
227
views
One Sample Wilcoxon effect size
I am struggling with effect size calculations for the Wilcoxon test for one sample in R.
My data:
item1 <- c(1,5,3,4,4,2,3,2,1,4,5,4,3,1)
...
- 111
0
votes
1
answer
539
views
Calculating effect size of wilcoxon test after correction for multiple comparisons using R
I am trying to compare two amino acid concentrations after two treatment variations. The data is not normal distributed, so I have to use non-parametric tests. I calculated the adjusted p values, but ...
- 1
4
votes
1
answer
770
views
Determining direction of effect in Wilcoxon Test and interpreting pseudomedian in R
I originally posted this on Stack Overflow (https://stackoverflow.com/questions/72649894/determining-direction-of-effect-in-wilcox-test-and-interpreting-pseudomedian), but I realized it fits better ...
- 61
1
vote
1
answer
352
views
If I use the wilcox.test from R for paired data, what exactly it returns? I want to compute the effect size based on that
I want to calculate effect size for the paired Wilcoxon (signed rank).
There are two options: Z/sqrt(N_pairs)
or the rank-biserial correlation.
The wilcox.test(... paired=TRUE) returns "V".
...
- 11
1
vote
1
answer
1k
views
Is the r effect size that is used with Wilcoxon sing rank test also good to use with sign test
Is the r effect size that is used with Wilcoxon sing rank test (more about it here: https://www.researchgate.net/post/...
- 1,089
6
votes
3
answers
4k
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 ...
- 171
1
vote
0
answers
1k
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 ...
- 11
1
vote
1
answer
1k
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 ...
- 21
2
votes
0
answers
5k
views
How to interpret rank-biserial correlation coefficients for Wilcoxon test?
I know that Pearson's $r$ correlation coefficient can be classified as follows (Wikipedia entry):
small size if $r \in [0.1, 0.3)$,
medium size if $r \in [0.3, 0.5)$
large size if $r \in [0.5, 1]$
I'...
- 1,099
21
votes
2
answers
56k
views
Effect size to Wilcoxon signed rank test?
Some authors (e.g. Pallant, 2007, p. 225; see image below) suggest to calculate the effect size for a Wilcoxon signed rank test by dividing the test statistic by the square root of the number of ...
user14650