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Is Serial Independence, an assumption in Friedman and Kruskal Wallis Tests

I understand that Friedman and Kruskal Wallis are non-parametric tests to see if different groups come from same population. I also gather from here that these tests are used to test for seasonality....
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1answer
39 views

Statistical Analysis of 3 groups(parameterisation of same algorithm) under the same dataset: non-repeated measures or repeated-measures?

I'm analyzing the performance of 3 parameterizations of the same algorithm under the same dataset. This performance is user-evaluated under a single Likert-type item (5-values). Given the ordinal ...
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1answer
24 views

Independent or matched groups?

A very beginner level question here: I'm trying to see whether there is a difference in how students assess the usefulness of 5 possible courses to be added to their curriculum. Each student was asked ...
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1answer
30 views

Is the ICC appropriate here?

I have N tissue samples, labelled as either A or B. 2 measurements are taken from each sample. The data is not normally distributed. I'm interested in 2 things: firstly, whether there is ...
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0answers
18 views

Friedman and Kruskal

I have a data with 4 groups and multiple variables with measured values. my groups are ES, EP, PP and PS. ES and EP are associated and PP and PS are too. So i would like to compare my groups in non ...
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1answer
46 views

Which statistical test for my data?

(EDIT: question simplified) This is a basic question, since I am new to data analysis and statistics. I am carrying out a 2X3 factorial survey where participants are presented with a series of ...
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2answers
283 views

Friedman's test or Kruskal-Wallis?

I am investigating the effect of an intervention treatment on a group of samples over 5 time points (a period of 2 months in total) For example: Subject 1 - Timepoint 1 (Dose 1), 2 (Dose 1), 3 (Dose ...
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0answers
43 views

Can I use the Kruskal-Wallis test for measures on the same animal before and after a treatment has been applied

In my experiment I have 3 treatment groups. Behaviours are scored for each subject (while they are isolated) before and after the treatment is applied. I thought that the Kruskal-Wallis test could ...
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0answers
190 views

Should I use one Friedman test or two Kruskal-Wallis tests on small sample?

I am looking at concentrations at 3 sites over 4 years, with 4 samples at each site. Because of the small number of samples, I believe I should use non-parametric statistical tests. My question is: ...
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0answers
187 views

Is there a risk in performing Kruskal-Wallis test instead of Friedman test?

My understanding is that the Friedman test is usually performed on unreplicated blocked data. A matrix containing such data would look as follows: ...
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1answer
333 views

Kruskal-Wallis or Friedman

I have 3 groups of 30 fish. group 1: without anaesthesia group 2: clove oil anaesthesia group 3: MS-222 anaesthesia Every group was investigated at six levels ...