All Questions
Tagged with wilcoxon-signed-rank wilcoxon-mann-whitney-test
66
questions
2
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what is the meaning of “One-sample test.”？The following is clearly a two-sample test for wilcox.test
The code that inspired this question can be found here and below:
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- 19
0
votes
1
answer
25
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How to compare semi-independent groups?
I need to compare the answers to a questionnaire (pre / post). The questionnaire was designed using a Likert scale. The two groups were made up of populations, some of whom were in both groups but ...
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0
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1
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30
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Can I use Mann-Whitney U test for within group analysis?
I am conducting a within-group study where participants rate the perceived helpfulness of ideas on a Likert scale (DV) across two different days (Day 1 and Day 2), serving as the independent variable (...
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0
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9
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Basic question regarding before and after intervention analysis on groups of different sample size
Apologies for the basic nature of this question. I have collected data before and after an intervention and assessed response to the intervention using a survey. This was a basic survey using a 1-5 ...
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0
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0
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14
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Test(s) for comparing predictor quality for different features?
I applied a predictor to different numeric features from the same group of subjects (n>1000). The features have different ranges. Is it possible in this case to apply a statistical test to make a ...
0
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0
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30
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Analysing pre and post intervention MCQ results for significance- which statistical test to use?
I have ran a teaching course for students. I carried out pre and post session MCQ quizzes to evidence effectiveness of the course, however the marks collected were anonymised (data collected via ...
3
votes
1
answer
201
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Why is the pseudomedian better than the median in a Wilcoxon test?
The wilcox.test function in R calculates the pseudomedian and a confidence interval when conf.int=TRUE.
In this question, ...
- 157
3
votes
1
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175
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Independence assumption of non-parametric tests (Mann-Whitney & Wilcoxon Signed rank)
I'm interested in testing (one at a time) these two hypotheses using the...
Mann-Whitney U test.
H0: The probability that an observation in Group1 is greater than an observation in Group2 is 0.50
But ...
- 1,653
1
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0
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134
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Alternative for Wilcoxon Test?
I'm ending my Master's Thesis, and I'm trying to figure out which test to use to calculate the significance of my data.
Basically, we measured the Free Kick biomechanical parameters of several ...
1
vote
1
answer
609
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I have the same group and want to test differences for two (unrelated) variables - Do I use Wilcoxon signed-rank test or Wilcoxon rank sum test?
I wonder if this is a case that it not clearly specified:
Typically, Wilcoxon rank sum test / Mann–Whitney U test is used for independent groups and testing the values of different variables against ...
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1
vote
1
answer
61
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What test should I use for a unipolar ordinal rating-scale?
I am trying to analyze answers to 5-point unipolar rating items.
The possible answers can for instance be:
Not at all difficult, Slightly difficult, Moderately difficult, Very difficult, or Extremely ...
- 113
2
votes
1
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33
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Compare whether one group are significantly closer to real observations than other
I have two groups consisting of non-parametric estimated data of a phenomenon. I want to compare these two groups of estimations with a third group of real observations of the same phenomena. ...
0
votes
1
answer
302
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Mann Whitney U or Wilcoxon Sign Rank test?
I have been collecting data where participants have been allocated to one of three different conditions and had to answer some questions. The data looked like this:
...
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0
votes
0
answers
520
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Pairwise comparison - too many groups
I have 23 groups that I am comparing. I was just going to show the distribution of the groups with boxplots but a reviewer of my manuscript wants me to do group testing. The trouble is that pairwise ...
- 101
1
vote
1
answer
352
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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".
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