Questions tagged [wilcoxon-signed-rank]
a non-parametric rank test to compare two paired samples, whether values in one are bigger than in the other. This test is NOT the same as the sign test.
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Statistical test for unequal sample sizes of repeated measures (non-parametric)
I'm looking to understand the differences between various sources (50) that evaluate an event based on 8 ordinal scales (varying from 2 to 4 values) associated with a discrete score between 0 and 10, ...
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Validity of Wilcoxon Signed Rank or Spearman for 2 Likert Scales
I am working on my MSc dissertation findings and I have data results from two 5-Point Likert scales. One Likert measured self-assessed behaviour, whilst the other measured attitude. (Both scales were ...
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How to compute the power of Wilcoxon test?
I am using Wilcoxon test to compare two paired sets of data for whether their means differ. Besides the p-value, I would also like to know the power of this test. How do I compute it in R?
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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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Can Wilcoxon signed rank test be used with sample size of 4 paired data sets?
My Project compares pre-test and post-test ratios in addition to pre-test and past-test Likert scale. I planned to use Wilcoxon signed rank. I only have a sample size of 4. Can I still use Wilcoxon ...
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Appropriate tests on discrete and paired data
I am going back and forth on which tests to do.
I have two paired variables, that are both positive integers (0,1,2,3...etc). $n = 559$. The variables represent the error resulting from two different ...
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How to run Friedman test correctly across three sets of questionnaire data divided into sub-groups?
I am trying to evaluate the usability of three prototypes of an application and want to see if there is a significant difference in terms of usability.
For this I have collected responses from users ...
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The Wilcoxon signed-rank test without symmetry caused by one outlier
I am comparing two algorithms on the same input data. Now I want to see whether the difference in output is significant. For this I need to use the Wilcoxon signed-rank test, since my data is paired ...
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Wilcoxon - one sample abnormal stock returns
I got a dataset with abnormal stock returns for around 400 securities and i need to find out if they're statistically different from zero. They don't follow a normal distribution, so i would like to ...
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How should I analyze data that is paired and also repeatedly measured?
I have data collected from the same subjects (n=10) over 11 days, with measurements taken under two conditions each day: immediately after training(D0) and 30 minutes after training(D30). The data is ...
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Can Wilcoxon be used in large sample with non-normal distribution?
I am doing my undergrad research, aiming to know the difference of before and after an intervention.
our sample size is 37 which is already considered as a large sample right?
However, when we test ...
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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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Wilcoxon signed rank test in QI macros
I need some help in understanding the wilcoxon signed rank test. I am using this test on comparing two analysers. We ran the same samples on two analysers for the PT (prothrombin time), the results ...
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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 ...
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Questions about equivalence hypothesis testing
The setup for the current question is the same as a previous question of mine, with one important difference: I have decided to go for a paired test, by always performing two consecutive experiments ...
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