All Questions
Tagged with wilcoxon-signed-rank kruskal-wallis-test
10
questions
2
votes
1
answer
247
views
Kruskal-Wallis Test shows significance, but Pairwise Wilcoxon Rank Sum Test does not
I used the following code to perform a Kruskal-Wallis test on a dataset, which gave me a significant p-value (5.159e-06).
However, when I then use pairwise.wilcox.test() to perform a Pairwise Wilcoxon ...
3
votes
1
answer
53
views
Test on significant difference
I need to test if there is a significant difference in leakage between prototypes. I've tried kruskal wallis and post hoc wilcoxon pairwise and Dunn-Bonferroni test, and the post hoc test always say ...
- 31
3
votes
2
answers
684
views
Statistical significance test of kurtosis differences
I would like to raise a problem that bothers me. However, I would like to point out right away that my question is purely theoretical, and the data presented here comes only from a computer experiment ...
- 160
4
votes
1
answer
64
views
Ways to state relationships like "A explains x% the variation in B" but when variation is not present like for non-parametric tests
Example:
Income explains 70% of the variance in expenditure.
Variation in driving speed can be explained by drivers' age.
How does one make such statements if the test used is a non-parametric one? I ...
- 139
1
vote
0
answers
41
views
Why several studies change logical paired/unpaired assumption from omnibus to post-hoc?
There are several studies of highly-referenced researchers where a paired post-hoc test (e.g. Wilcoxon signed-rank) follows the omnibus unpaired test (e.g. Kruskal-Wallis):
From Huang et. al "THE ...
- 165
0
votes
1
answer
47
views
What is the appropiate Non-parametric test for study with 3 conditions?
The IV has 3 separate conditions & the DV measures Pre & post scores (ultimately to see what condition has the biggest effect on the scores - if there is any). The data is non-parametric- ...
1
vote
0
answers
198
views
Is it appropriate to use Kruskal-Wallis test for one comparison and Wilcoxon Signed Rank Test for another?
I have a data set that I would like to perform several tests on to see if there are significant changes over time.
I have replicated measures of 3 experimental ponds and 1 control pond that I have ...
- 53
6
votes
2
answers
13k
views
Wilcoxon-signed rank vs Kruskal-Wallis?
I am rather stressed out about my methodology. For my PhD I ran a year long literacy intervention (small scale longitudinal study) that was supposed to test the rate of change in individual students' ...
- 61
4
votes
3
answers
4k
views
Same p-value. Is it normal?
I did the following comparisons with a Wilcoxon test on MatLab, and I got the same p-value on both. Is this normal? Is there something wrong?
Also, the tests indicate not to reject H0. How to ...
- 287
4
votes
2
answers
1k
views
Why am I getting inconsistent results from Wilcoxon signed rank test and Kruskal-Wallis test?
I am doing a study on 3 drugs, comparing response pre-post treatment. My objective is to know if these drugs are effective and which one is better. I used non parametric tests since the results weren'...
- 49