All Questions
Tagged with nonparametric multiple-comparisons
54
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Question on non-parametric tests and comparing two groups across countries
I have a dataset with every election in various countries between 1900 and 2010. There are about 300 elections but only between 20-40 elections in most countries. I am trying to test whether ...
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Dunn test and specific comparisons
What I need is a non-parametric alternative for Dunnett test to compare several groups with a control group (not all pairwise comparisons). And I realise that a specialised test is more appropriate ...
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Multiple comparisons for not normal and heterogeneous data
I have a data set that has 3 groups and a single variable. Under normal circumstances, a one-way ANOVA would be used for comparisons between my three groups. HOWEVER I ran a Shapiro-Wilk test for ...
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Is Dunn-Sidak approach in MATLAB multcompare identical to so-called Dunn's test?
I've asked the same question elsewhere.
These two articles recommend Dunn's test as non-parametric post hoc multiple comparison test following Kruskal-Wallis test.
How the Dunn method for ...
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Kruskal Wallis test gives significance, multiple comparision table doesn't
I'm comparing physico-chemical properties of 8 different kefir samples like viscosity at different storage times. I have 4 viscosity measurements for each group. When I conduct Kruskal Wallis test; ...
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Nonparametric multiplecomparison tests for discrete data
Suppose I have $K$ populations each consisting of $n_i$ ($i=1\dots K$) observations $x_{j,i}$ ($j=1 \dots n_i$). Each observation is comming from a Bernoulli distributed random variable $X_{j,i} \sim ...
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Multiple comparisons between two groups (non-parametric)
Update Added more details about the Experimental setup.
My experiment comprised two groups, control (N=25) and experimental (N=26). Each participant belonged to one group. Their performance has been ...
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What test should one use when dealing with different treatments in plant clones?
In an experiment involving plant clones there are: 20+ treatments, 5 technical replicates for each treatment (plant clones in which the treatments were tested).
Variable of interest is Biomass.
Due ...
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Pairwise non-parametric test?
I have 5 groups of patients (different sizes), for which I measured some property that is continuous but not normally distributed. I would like to compare every pair of groups in respect to this ...
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Which test to use to detect if a process has significantly more errors than another?
A have a set of machines running a particular software. I want to do something that's called "canary deployment".
This consists of deploying the new version of the software to a subset of machines ...
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How can I run multiple tests in a valid and random fashion?
I hope this is the correct place to ask this question. I'm currently doing research where I'm comparing two groups on their EEG frequency spectra. I wasn't too sure how to approach this.
Data:
I ...
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How to compare several means to control when the distribution is not normal and sample sizes are unequal?
I have a large dataset (n = 170,000), distributed roughly equally among 5 groups (each is 34,000 ± ~1,000). I want to compare whether the means in any of the first 4 groups are different from the ...
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Nonparametric test for 1 categorical IV and multiple binary DV:s?
I have a dataset where test subjects have answered three different questions (my IV). The answers to each question are scored on 10 different variables (presence or absence of 10 concepts in the ...
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Pair-wise comparisons in non-parametric ANCOVA in R/SPSS
I'm running a non-parametric ANCOVA in R. I'm using the non-parametric ANCOVA from the fANCOVA package. https://cran.r-project.org/web/packages/fANCOVA/fANCOVA.pdf
I'm getting the results below. Now I ...
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Can I use a permutation test to determine whether overlap of 2 distributions is significant?
I am evaluating whether two distributions are different from each other. For example, histogram A (B) has most of its binned values between 10-15 (15-20). So, histogram B has a right-ward shift in ...
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