The Kruskal–Wallis one-way analysis of variance by ranks is a non-parametric method for testing whether samples originate from the same distribution. It is used for comparing more than two samples that are independent, or not related.
Questions tagged [kruskal-wallis]
102 questions
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How to find meaningful boundaries between two continuous variables in R
To find the relationship between two columns of the iris dataset, I am performing kruskal.test and p.value shows a meaningful relationship between these two columns.
data(iris)
kruskal.test(iris$Petal.Length, iris$Sepal.Width)
Here are the…
Saurabh
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How do I perform a loop for kruskal wallis test comparing 3 groups over multiple columns without changing the pvalue?
I am fairly new to R and I am trying to run a kruskal wallis test to see if there is a difference between three groups when looking at different genes. I have 3 groups and 127 proteins. I have been able to create a code that will do…
RRookie
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Kruskal-wallis test in R gives an error: Error in model.frame.default: variable lengths differ
I am trying to run Kruskal wallis tests for multiple columns in my example dataframe (df) in R, but I am stuck with the following error:
Error in model.frame.default(formula = as.numeric(x) ~ as.factor(Groups), :
variable lengths differ (found…
Letin
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Does Dunn's test (particularly the Z-statistic) say anything about direction?
I have conducted a Dunn's test to compare the distribution of factor scores across three nominal variables. How do I interpret the signs of the Z-statistic? Do Z-statistics say anything about direction?
Jo3
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What is the best way to manage/store result from either posthoc.krukal.dunn.test() or dunn.test() - where my input data is in dataframe format?
I am a newbie in R programming and seek help in analyzing the Metabolomics data - 118 metabolites with 4 conditions (3 replicates per condition). I would like to know, for each metabolite, which condition(s) is significantly different from which.…
Pearl_Lo
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Kruskal-Wallis rank test between different subsets of data table
I have a table like this:
chr start end con1_1_1 con1_2_1 con1_3_1 con2_1_4 con2_2_4 con2_3_4
1 1 1 7512 0.45180723 0.21982759 0.06666667 0.4105960 0.1024735 0.2284710
2 1 13169 20070 0.07142857 0.77631579 0.90434783…
user3683485
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Test for difference by outcome (Yes/No) by each level of a factor - with one outcome level missing in a factor level
I need a method to divide a vector (bloodsample values) by each level of a factor of time intervals (gacat) and compare these data (by t.test/ANOVA or Kruskal Wallis) between two levels in an outcome factor variable (EPL (yes/no))
In the mtcars…
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Pandas apply kruskal-wallis to numeric columns
I have a dataframe of 27 columns (26 are numeric variables and the 27th column tells me which group each row is associated with). There are 7 groups in total I'm trying to apply the Kruskal-Wallis test to each variable, split by group, to determine…
kynnemall
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Can Kruskal-Wallis test be used to test significance of multiple groups within multiple factors?
I have tried to read what I can on Kruskal-Wallis and while I have found some useful information, I still seem to not find the answer to my question.
I am trying to use the Kruskal-Wallis test to determine the significance of multiple groups,…
user3245629
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Kruskal-Wallis test between a list sublists in R
I'm pretty new to R.
I'm trying to run a Kruskal-Wallis test between data-framed sub-lists (containing numeric data) within one list but I keep on getting errors.
Each sub-list has one column but an unequal number of rows (hence, they can't be…
Keity
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Kruskal test Error in kruskal.test.default(e, f) : 'x' and 'g' must have the same length
I am trying to do a kruskal wallis test on the following datasets:
e<-c(0.0018, 0.0021, 0.0028, 0.0029, 0.0044, 0.0045, 0.0074, 0.00325140981291511,0.00325140981291511, 0.00325140981291511, 0.0079, 0.001978252063446,0.00684016798870973,…
John
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Difference between posthoc.kruskal.dunn.test and dunn.test
I am currently searching a way to perform a dunn test in R. While doing that I came across multiple functions that have the Dunn test implemented.
library(dunn.test)
library(PMCMR)
dunn.test(x=mtcars[,"wt"], g=…
ELHL
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Optimize Kruskal Wallis Test Spotfire
On spotfire i had created several Kruskal Wallis test. First i had created a pivot table and after i did a data relationship (Kruskal Wallis). Then i reflate my tests with a button (script python).
That is my code :
kruskal =…
Laurent Cesaro
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Dealing with ties in agricolae Kruskal test, R
I am running a kruskal.test on some non-normal data with the agricolae package. Some groups have exactly the same value as each other. The kruskal test doesn't handle this well, I receive the error Error in if (s) { : missing value where TRUE/FALSE…
J.Con
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R Kruskal-Wallis with multiple factors
I'm looking for help on performing the Kruskal-Wallis test on my set of data for a large number of factors. I can perform the test for a single factor, like AD_1yr:
kruskal.test(Shannon ~ AD_1y, data=comm)
But I have over 50 factors I want to test,…
user2988430
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