Questions tagged [friedman-test]
A non-parametric test for the equality of >2 dependent groups.
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Can a Friedman's ANOVA be used for groups of different size?
The independent variable in my data is verb class: I have got four verb classes, each consisting of ten verbs. The dependent variables are accuracy (either 0 - incorrect or 1 - correct), and reaction ...
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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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Statistical Significance Testing for Nested Cross-Validation in ML Experiment
I am currently working on an ML experiment where I use a nested 5-cross validation procedure and obtain a NDCG@10 scores for each test user. I am comparing 6 different ML algorithms and have data for ...
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What Statistical test to use on my project?
I am very confused about what kind of statistical test to use in RStudio on my project,
I have measured the mean salinity for 3 levels of population density (low medium and high) across 6 months (...
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What if using Friedman test on dependent variable that is nominal data?
I have a group of 30 participants who did a test for three times. Each time, The independent variable was changed and the participants reported their answers (dependent variable). The independent ...
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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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Identifying the type of missing data and the post hoc test that can be carried out for Skillings Mack test
I have a non-normal paired sample dataset. Each row represents a dog that has been tested for an experiment. Each dog was provided with three cues (treatments): 5s cue (aka only face cue), vocalone (...
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Alternative to Nemenyi posthoc test that can use variance
I am applying statistical tests from paper "Statistical Comparisons of Classifiers over Multiple Data Sets" J. Demsar (link) in my own work. However, variance is pretty important, since ...
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What test should I perform given repeated measures of one subject in three time periods?
I have data that represents the measurements of the concentration of PM particles in the air at different times (every hour of every day from 2018 onwards), and I am supposed to test whether the rules ...
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Friedman test for small sample single arm trial?
I am looking at a single arm clinical study with a small sample size (n=14), where each patient was assessed 5 times (weeks 1-5, once a week). I have constructed linear models to see if the change-...
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Is there any post-hoc test for multiple comparisons after conducting the Friedman test by two group using a preference ranking questionnaires?
I have this dataframe:
group1<- matrix(c(rep(1,5),rep(2,5),rep(3,5),rep(4,5)), ncol=4)
group2<- matrix(c(rep(4,5),rep(3,5),rep(2,5),rep(1,5)), ncol=4)
I ...
Javi
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What is the most common Nonparametric Global Test of Difference for Repeated Measure?
The experiment goes like, there are two different machines, Machine_A and Machine_B and a Technician. The machines have the same purpose which is for measuring a continuous quantity (be it weight, ...
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Is there a method bias when I prefer a specific post-hoc that shows a significance after significance in test of difference in groups?
I'm working to see if a machine does better than a worker in terms measurement (by having a measurement from an expert be the control). So my dataframe contains the Measurement Value, Measuring Device,...
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Which test in this case ? Friedman not possible
I have done a benchmarking of multiple learners on multiple tasks with nested CV (inner loop : CV 3F, and outer loop : CV 3F). My datas have 1052 observations and each task have 10-12 features.
I ...
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What is an appropriate post hoc test after the Friedman test?
I've read several posts related to this, but I'm not sure.
so I'm posting the question in case it's redundant.
I have been conducting an experiment using a within-subject design, comparing three ...
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Why is my Friedman posthoc test said to be "true" with a p value of 0.06?
I used the function friedman.test to test for differences between multiple conditions and then used friedmanmc as a posthoc test....
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How to run Wilcoxon signed-rank test for pairwise comparison of two factors with three variables each?
I performed a study where I took 9 measurements from each participant for 2 factors (time/ location) and 3 variables each. These created the following combinations:
T1L1, T1L2, T1L3, T2L1, T2L2, T2L3, ...
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Why is my result significant when there is no difference between means?
I have run a Friedman's test in R and it has given me the following result:
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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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Error when conducting a Friedman Test in R
I am trying to run a Friedman Test on some data in R. I would like to measure a 3-way interaction with a repeated measure. However, I keep getting a persistent error message when I run the code and ...
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Hypothesis Test for Ranked Preference?
I am conducting a survey where people are required to rank 3 different designs from 1st to 3rd. For example, there are 3 designs - A, B and C. Participants are required to rank them in order of ...
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Calculate CI for chi-squared of the Friedman test in R
I have a dataset (not normal distribution) with repeated measures over time. As such I was planning to use the Friedman.test in R:
friedman.test(dash ~ time | nr)
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Clustered data and the Friedman test
Good morning, I am performing a risk factor analysis of the individual and household-level factors associated with Plasmodium infection in individuals located in 8 villages in Cambodia.
I have ...
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Post-hoc tests after Friedman test
In Statistical Comparisons of Classifiers over Multiple Data Sets (p. 12) Janez Demsar suggests to use the Bonferroni-Dunn test as a post-hoc test after the null hypothesis of an initial Friedman test ...
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Trouble interpreting Friedman Test for 3-way repeated measures ANOVA
I would like to use a Friedman Test as a non-parametric alternative to a 3-way ANOVA in RStudio. I would like to measure how 'cl_conc' (Response Variable) is affected by 'soil_type' (Fixed Effect #1 - ...
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Friedman test_multiplicity
I'm performing Friedman test to see if there is a difference between 8 treatments, then if it is significant I'll do Wilcoxon signed rank test to see which pair is significant. I wonder if I should ...
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Repeated Measures, or just measuring the same thing, repeatedly?
I understand what "repeated measures" denotes - given a set of subjects, if each subject receives more than one treatment, we call this repeated measures, or "within subjects." But ...
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Analyse ordinal data between subjects
I have two groups of participants, group 1 looked at four images under condition 1, and group 2 looked at the four images under condition 2. I want to see whether the condition influenced the order in ...
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Friedman's test and unequal sample sizes
I have movement information from 4 animals across different moon phases. I want to compare if their movement (eg. distance traveled per night) varied among different moon phases. However, I do not ...
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How does the Friedman test extend the sign test?
Every book/article claims this as if it's self-evident, but I have a hard time figuring out why. How do you get from the sum-of-squares style statistic of Friedman to the difference statistic involved ...
