Questions tagged [friedman-test]

A non-parametric test for the equality of >2 dependent groups.

Filter by
Sorted by
Tagged with
0
votes
0answers
2 views

Is it possible to apply Friedman test for two classifiers?

Some authors emphasis that Friedman test can be used to compare more than 2 classifiers. Is this true? Is it possible to apply Friedman test to compare two classifiers ?
0
votes
1answer
23 views

What does it mean if Nemenyi test does not return that the performance of two methods are significantly different while the Wilcoxon test does?

I want to compare the performance of $N$ methods on $m$ datasets. I performed the Friedman test and after that the Nemenyi test. The Nemenyi test is though not powerful enough to conclude that there ...
0
votes
1answer
65 views

Friedman's test in SPSS gives different results from R and python

I have a repeated measurement of n=452 participants. The Friedman test of SPSS gives df=2, chi-square 36.970 whereas below is the output of R and python. I cannot explain this difference for chi-...
0
votes
1answer
27 views

Kendall’s Coefficient of Concordance (W) is different when calculate with two formula: SPSS VS python

I used the Friedman test to compare three repeated measures and I use Kendall’s Coefficient of Concordance (W) to get its effect size. SPSS uses this formula: F (from Friedman test)/n_f (k-1), and I ...
1
vote
1answer
32 views

How to do Friedman test and post--hoc test on Python? [closed]

I know that Python's SciPy library has the function for the Friedman test But, it is not enough as I need more information for posthoc test. So, how I do Friedman test and post-hoc test entirely on ...
0
votes
0answers
15 views

Does `friedman.test()` need assumption of `balance design`?

I want to know whether friedman.test() need assumption of balance design. Then I searched R ...
1
vote
1answer
13 views

Can I use `wilcox_test()` to compar multiple means without `friedman_test()`?

In this example,use friedman_test() first to find significant difference between group,and then use ...
0
votes
0answers
14 views

Friedman test: non-significant post hoc (exact and Nemenyi test) should I run Wilcoxon signed rank tests or Sign tests? Or just accept the results…?

In my data, participants were tested on the same ordinal variable 3 times. In order to test for within-group differences, I ran a Friedman test. After reading this post, I ran the friedmanTest ...
1
vote
0answers
50 views

Friedman test when the observations are different from each other

I have database which has data about 72 plants, that got 6 different treatments. I have measured the weight of those plants every day and every hour for the past two weeks.so basically there is ...
2
votes
1answer
22 views

Statistical test for ordinal variable distribution between groups

I have a dataset with sentiment of tweets labelled as 1, 2 or 3 (1=Negative, 2=Neutral, 3=Positive) ... 10,000 observations approx. I have this split by geographic location (Africa, Americas, Asia, ...
0
votes
0answers
12 views

What does each input parameter mean for the repeated measures ANOVA on G*Power

I am currently trying to calculate my required sample size for a follow-up experiment using GPower. I have some experience with GPower, although it is limited, and I have never really used it to ...
0
votes
0answers
14 views

How can I analyse several ordinal dependent variables across multiple time points?

So, I have several ordinal scales that have been administered to the same sample at three different time points and each is being treated as separate dependent variable. I can't run a repeated ...
0
votes
0answers
23 views

Most suitable stat test for this data?

Looking for a difference between: count and size, exposure, animal and colour (CountXsizeXexposureXanimalXcolour). There are 480 data in each column of which: 240 each - size (0.5mm and 2mm) 240 ...
2
votes
2answers
229 views

Repeated measurements with different measurement methods and uneven sample size - which test is suited?

I am struggling to find the appropriate statistical test to analyze my data. I hope that my question will be understandable. I have the following setup: A porcine spine with three vertebral bodies (...
0
votes
0answers
18 views

Which stats test (Kruskal-Wallis, Mann-U or Friedman's) for comparing multiple parts of an experiment?

I have data from how long it took male beetles to respond to a female beetle pheromone (and indeed if they did so as over half didn't and none of the controls did). There were two pheromones tested. ...
3
votes
1answer
80 views

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 ...
0
votes
0answers
13 views

Friedman's test with different # of answer choices

Greatly appreciate your help! I am analyzing paired data across 3 groups. Data within each group is ordinal (number of genes recommended for genetic testing, with each answer choice corresponding to ...
0
votes
0answers
14 views

Friedman's Test fails inspite of big differences between the average ranks of algorithms

I performed Friedman's test to validate that a particular algorithm is statistically different from other compared algorithms. For example: I wanted to prove my ...
1
vote
1answer
55 views

Question on the Friedman test and statistical significance

I have 322 clothing items that have been ordered by our military from 2013 to 2018. Each military member is either in a Tier 1 or Tier 2 location. I ran Friedman tests on each individual item over ...
0
votes
0answers
26 views

Is Wilcoxon test not useful in my scenario? Should I go for Friedman instead?

The background: After I've conducted a survey about preferences of users in ridesharing, I now want to construct an order of importance of these preferences (this is to answer one of my research ...
0
votes
1answer
42 views

Choice of non-parametric test in repeated measures

I have a question concerning the statistical analyses to conduct in the context of a psychology experiment. There are two groups of students (experimental and control) who are exposed to either the ...
0
votes
0answers
24 views

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....
1
vote
1answer
68 views

Friedman test for rank order question - Comparing between groups

In my study, participants ranked a total of 5 designs (different lamp types) in their order of preference (absolute favourite, second favourite, etc.). Participants ranked all lamps, and lamps were ...
4
votes
1answer
194 views

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 ...
0
votes
1answer
49 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 ...
0
votes
1answer
55 views

How to arrange my data for Friedman's test

I have conducted a study where participants have seen photos of people in different categories, let's call them A, B C, and D, and have ranked four pictures in each category on 1st choice to 4th ...
0
votes
1answer
32 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 ...
0
votes
1answer
40 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 ...
1
vote
0answers
14 views

Analysis for a Within-Subjects Design with Ordinal IV and Continuous DV

I have a set of non-normal data I'm trying to analyse but am worried I'm violating the assumptions of my chosen test. I have a 18-trial within subjects experimental design. Participants received an ...
0
votes
0answers
66 views

How do I set up the data for a Friedman Test?

Below is a small sample of a very large data set (over 10,000 records). All I'm trying to do is determine if there's a statistically significant difference found in the ordering of supplies among ...
0
votes
1answer
47 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 ...
1
vote
0answers
17 views

How to compute the average aligned ranks of variables from Friedman's test [closed]

In the paper EUSBoost: Enhancing ensembles for highly imbalanced data-sets by evolutionary undersampling, in figure 2 and 3, the average aligned ranks of methods being compared are plotted. Can ...
0
votes
1answer
40 views

How do I report a Friedman Test when the sample violates the assumption: 'Group is a random sample from the population'?

How do I report a Friedman Test when the sample violates the assumption: 'Group is a random sample from the population'? My study involves a group of participants receiving an intervention and a ...
1
vote
1answer
165 views

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 ...
0
votes
1answer
24 views

testing whether categorical distributions differ

i have data on how a large population (N ~ 1e8) is distributed into (many) categories (i.e. i have count of instances in each category). some categories have low ...
0
votes
0answers
74 views

Friedman Test not significant but Post Hoc Tests are?

I am running a Friedman test to find out if there are differences in a ranking between 4 treatments (Drive, Interaction, Track, User). 1 best application, 4 worst application. For example Proband 1 ...
0
votes
1answer
210 views

Friedman test with several repetitions

I'd like to run a non parametric test such as the Friedman test on the data of my experiment. I have several algorithms ($n$) which I'm comparing against each other. These algorithms are run on $k$ ...
0
votes
1answer
115 views

non-parametric test: proof of Friedman's statistic

I am asked to prove that the Friedman statistic has two equivalent forms, namely: This is my attempt at a solution starting from LHS and trying to arrive at RHS. I feel like there are some ...
0
votes
1answer
407 views

How to obtain the results of the Nemenyi post-hoc test in a table showing grouped pairs?

I performed a Friedman's test, which showed that there are differences among my treatments. Thus, I choose to perform the Nemenyi's post-hoc test in order to infer which treatments statistically ...
0
votes
1answer
304 views

Tukey-Kramer or Nemenyi following Friedman

I previously asked a question here after discovering an option by MATLAB to run Tukey-Kramer for multiple comparison multcompare following Friedman test and many ...
0
votes
1answer
79 views

Correction needed for an non-parametric Anova?

I'm trying to analyze the behavioral data of my research experiment and I'm a bit lost... o_O Briefly, subjects undergo 4 different conditions (of increasing complexity 1<2<3<4). At the end ...
3
votes
1answer
1k views

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 ...
0
votes
1answer
312 views

RM one-way ANOVA or Friedman test

I here my question. I'm testing with n=6 animals in 6 different situations. It's repeated measures because all 6 animals did the same tests. When I do the column statistics to see if the distribution ...
1
vote
1answer
612 views

Assumptions of the Friedman Rank Test

Let $X_i:= (X_{i,1}, ..., X_{i,k}) $ for $i =1...n$ be $\mathbb{R}^k$-valued random Variables with $k\geq2$. I wonder what the exact assumptions are to apply the Friedman test to Realisations of ...
2
votes
2answers
1k views

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 ...
1
vote
0answers
21 views

How can I analyze patterns rank order data across multiple sets of rankings?

I had respondents complete a survey in which they ranked five word definitions based on how important they were for 18 different words. I want to see if there are features, like part of speech, that ...
1
vote
1answer
683 views

Bonferroni correction for Wilcoxon signed rank test with 6 related samples?

I am comparing scores of the same group of people over 7 days. I first did a Friedman's test to know where the differences were between the 7 days and I did a Wilcoxon signed rank test for the Post ...
1
vote
2answers
587 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 ...
2
votes
2answers
251 views

Statistical Test Evaluation?

I want to use a statistical test to show that there is a significant difference between 9 algorithms over 2 datasets. I have read Demsar's paper and used Friedman's test (also used Iman's corrected ...
0
votes
2answers
82 views

Test to compare questions in survey

I couldn't find this situation described somewhere, though I think it's pretty common so I post it here. I have data from survey that is asking repondents to evaluate their color preferences across ...