All Questions
Tagged with nonparametric wilcoxon-signed-rank
94
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Can't decide between Paired t-test and Wilcoxon Signed-Rank test?
I'm using data for pre-2020 January-April and the year 2020 January-April (raw data with one datapoint per day, except for the 'pre-2020' category which is the values for one day in 2017, 2018, and ...
- 31
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2k
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Wilcoxon signed rank test for likert data and composite scores
I have a survey where I used seven point Likert scale for all the questions. With 1 being Completely disagree to 7 meaning Completely agree.
I wanted to combine multiple questions (let's say 7 of ...
- 133
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27
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Non-parametric version of one sample t-test but for multiple groups?
Suppose I have the following experiment set up. I'm trying to build a regression model to predict how much weight a person can bicep curl based on their bicep size. So I go ahead and have a bunch of ...
- 336
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46
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Paired t-test on large sample that *should* be normal, but isn't (or Wilcoxon Signed Rank Test)?
A dataset contains the number of fast food restaurants per thousand people for each county in the USA, for two different years (five years apart). 3,143 rows.
None of the following are normally ...
user252085
4
votes
1
answer
64
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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
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1
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387
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R removing zeros for pseudomedian and its confidence interval in wilcox.test?
It makes sense to me that we need to remove zeros to calculate the p-value in a Wilcoxon signed rank test. What confuses me is that R seems to leave the zeros deleted when computing the pseudomedian ...
- 775
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1
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71
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How to calculate a 𝑝-value for the difference between two non normal distributions of counts?
I have two NON normal distributions (a and b), they are also different lengths
...
- 101
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350
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How do two of my Wilcoxon signed rank tests have the same p-values?
I'm running a statistical analysis where I'm comparing land surface temperature in matched equal sized areas (project areas and control areas) of different cities. In each city, I do it for two ...
- 21
2
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1
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894
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Direction of a one sample Wilcoxon signed rank test
I am comparing a selection of values which come from a non-normal distribution to 0. I've done a wilcoxon in python:
result = scipy.stats.wilcoxon(values)
my W ...
- 217
2
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632
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Is Wilcoxon Test appropriate for paired categorical data?
There is currently a story in the news in the UK about negative effects of puberty blockers in children: 'It showed that after a year on puberty blockers, there was a significant increase found in ...
- 197
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1
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304
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Is my interpretation for Wilcoxon Signed Rank test correct?
I ran a wilcoxon signed rank test on paired samples where the outcome variable was a test score. The samples were paired by as siblings (younger and older sibling). I have a problem interpreting the ...
- 103
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23
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Imposing orders on distributions based on Wilcoxon test
I am trying to figure out part of a text I am reading about non parametric tests.
In there it is stated that:
The fact that the output of a rank test is driven by the probability that a value ...
- 131
2
votes
1
answer
2k
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How to graph Wilcoxon test power R
I've been trying to calculate and graph the correspondent power for the wilcoxon signed test and haven't had any luck.
I tried simulating two normal distributed samples, apply the wilcoxon test and ...
- 21
4
votes
1
answer
1k
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The Wilcoxon test for ordinal data
I would like to know if it is OK to use the Wilcoxon matched-pairs signed rank test to find significant differences between two sets of ordinal data, pre and post intervention (number of subjects is ...
- 41
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2k
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Select from Sign Test and Signed Rank Test based on assumption or power
I'm testing the difference of a paired dataset. I need to select between sign test and Wilcoxon signed rank test. I have read ...
- 155