Questions tagged [friedman-test]
A non-parametric test for the equality of >2 dependent groups.
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Friedman test and post-hoc test for Python
In my dataset, I have five (ordinal) groups with an x-amount of measurement. Because homoscedasticity is violated, I performed the Friedman chi-square test to see if there are any statistical ...
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Friedman's test is very significant, but its post hoc comparisons (SPSS) are not significant
I ran a non-parametric Friedman's test for my data in SPSS 22 and significantly rejected the null. That would mean that among the $k$ paired samples (3 in my case), there should be detected at least ...
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Is there a two-way Friedman's test?
I have ranked concentrations (from 0 to 5) of 5 different proteins from 3 different locations from the same patient. In total, 15 measures per patient and 61 patients, so 915 observations.
What I'd ...
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Alternative to Friedman Test in R
I am trying to run a Friedman Test in R with a repeated measure, however, my data do not qualify as an unreplicated complete block design. I am wondering what ...
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Non-parametric test for repeated measures and post-hoc single comparisons in R?
Some attribute $x$ of 17 individuals was recorded repeatedly on 6 time points using a Likert scale with 7 distractors. Which statistical test(s) can I apply to check whether the changes along the 6 ...
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All vs all post-hoc after Aligned Friedman (k classifiers over multiple datasets)
I have k classifiers and n datasets, and I have only one accuracy measurement (which is actually the average of three independent repetitions of the 5-fold-CV, i.e. average over 15 accuracy values) ...
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How to interpret the result of Friedman's test?
I uploaded the data and then I used bootstrapping to have 10 different samples from the original data but with the same length as the original data. For each sample, I used 7 distance metrics, and I ...
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Post-hoc Friedman Nemenyi Test
I used Friedman and Post-hoc Friedman Nemenyi Test.
In this PAPER, page 11, the Critical Difference (CD) equation is different from what has been used in R function, PAGE 14 ...
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Can Friedman's test be used with two samples?
When talking about Friedman's test, it commonly comes accompanied by a whole name of "The Friedman's test for three or more correlated samples".
The question is, could results be valid if I apply ...
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Equivalence of formulations for Friedman Test?
I'm trying to implement a Friedman test, and came across two sites giving methods for its implementation, namely, Wikipedia (perma-linking for posterity) and the NIST. At first glance, the general ...
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What is the right Bonferroni adjustment?
I am trying to test a hypothesis for my Masters Thesis.
There are 3 conditions (I will name them X, Y, Z), in each of which the data isn't normally distributed, and measures the improvement for each ...
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Post hoc test for Friedman test
I am running a Friedman test for my non-Gaussian data, on MATLAB. However, I am confused about the post hoc test to choose. Two concerns:
(1) MATLAB's multcompare ...
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Why run a post hoc wilcoxon signed rank test after Friedman test, why not just skip to Wilcoxon sign test instead?
I understand that one is required to run post hoc tests after the Friedman test. For example, while the Friedman test may find a statistically significant change amongst 3 treatments, one may follow ...
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Non-parametric, repeated measures two-sample test with small sample size
My data consists in two samples relative to the expression of a given gene, with 4 replications in both samples.
I am interested in testing whether the two samples come from the same population, ...
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Friedman? Unequal samples sizes
my students were involved in three different simulations. I was asked them to rate their satisfaction with these simulations on a 5-point Likert scale (several items). Unfortunately, I have 60 ...
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