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Questions tagged [tukey-hsd-test]

Tukeys Honest Significant Difference (HSD) is a multiple comparison method based on the studentized range distribution.

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When is Tukey post hoc test result identical to Games Howell post hoc test for Welch ANOVA?

In what situations is the Tukey post hoc test identical to the Games Howell post hoc test? I have an ANOVA analysis where HOV is violated and I have a statistically significant Welch ANOVA result. I ...
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Timepoint lsmeans post-hoc mean comparisons

Can anyone suggest which is the most appropriate test? I have changes from baseline (4 timepoints including baseline) in the Y axis and the timepoints in the X axis, 4 treatments. I want to see, if ...
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Is it possible to belong to two different homogenous groups for tukey-HSD

I want to start by saying I'm a beginner in statistical analysis, I'm learning for my thesis and I'm using the TIBCO Statistica software. So basically what I did is cluster analysis and got 4 ...
TiredStudent's user avatar
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Appropriate way to correct for multiple hypotheses with multiple one-way ANOVAs and Tukey's post-hoc

I have a dataset with four groups and 14 different dependent variables. Based on the answer given here, I think the best approach for my analytical question is to perform multiple one-way ANOVAs, ...
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Full Factorial Designs and Honest Tukey

I am trying to analyze the data of a 2x2x2x2 full factorial design experiment. (It wasn't my idea.) Mercifully, we have plenty of data per run, each run has the same amount of data, and normality and ...
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What really happens if I run Tukey without running ANOVA first?

I see that the theory says that if I want to test for difference in mean between 3+ groups I should use ANOVA first, and if ANOVA rejects the null hypothesis then I might want to look into Tukey as a ...
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Quantitatively distinguishing between multiple-comparison tests

As someone relatively new to applied statistics, I have been trying to better understand some of the best practices for applying statistical methods. I have been recently trying to understand when to ...
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Tukey test in R positive estimate but non significant p value when analyzing Attrak Diff Questionnaire results

I'm a Master's student analyzing the Attrak Diff questionnaire results from my user study. I do not have a background in statistics and I am struggling to interpret my results. I ran one way repeated ...
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Directional Anova Post-Hoc Analysis in R

prefacing this with the fact I have a concussion and may or may not be making sense/thinking clearly at the moment. I'm working on rewriting an assignment that asks us to find significant differences ...
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Can Tukey HSD groups be of slightly different sizes?

In my Tukey HSD I have some groups with 5 data points, and some groups with 6 data points. Is this allowed with Tukey HSD? The only option would be to remove 1 data point from some groups, and that is ...
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Tukey HSD - can I add an additional data point to each group?

When computing Tukey HSD I have multiple groups. For a homework assignment, I realized I accidentally included an additional data point in each group, which is the average of the group. Is this ...
James Mitchell's user avatar
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Meaning of "Unbalanced" Tukey HSD in R with Agricolae

The Agricolae package in R contains a function HSD.test which performs Tukey's HSD. This function has a parameter ...
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What is the best post-hoc test to use after a two-way anova has shown there is only a significant effect when including 0 as a factor level?

I have two factors: A and B, and a response, y. For factor A I have 3 levels: 300,400,500. For factor B I have 3 levels: 0.5, 0.6, 0.7. I carried out an experiment with each combination of these two ...
Noah Sprent's user avatar
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1 answer
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Tukey's HSD after permutation tests. Theoretically possible?

I'm interested in making more use of tidymodels' infer package, which lets one perform a variety of statistical tests by a simple algorithm. Here's an example pipeline for an F-test, where we aim to <...
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Post-hoc table in statistics

Please can someone help me interpret what the asterixis mean and how it is statistically different to the groups. I am so confused. I am doing a one way ANOVA looking at the effect of age on physical ...
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Help interpreting zeroinfl results from emmeans

I am working on the example Senecio data from Blasco‐Moreno et al. (2019) using the pscl package in R. I would like to conduct pairwise comparisons of mean rates (Damaged/Total_heads) and don't ...
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Confidence interval for difference of means for TukeyHSD vs two-sample t-test?

I have some data with categorical predictors and I'm wondering about comparing the confidence intervals of difference in means of one pairwise comparison in my TukeyHSD analysis vs that of a two-...
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The theory behind Tukey's HSD test.

I have not been able to find satisfactory explanations for the logic behind Tukey's HSD test. However, the resources I have been able to find all concern it's use. It's supposed to make multiple ...
ThighCrush's user avatar
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How is $q_{\alpha,k,N-k}$ in Tukey's test calculated?

On the wikipedia page for Tukey's range test, under section Confidence Limits, a quantity $$q_{\alpha,k,N-k}$$ makes an appearance. Unfortunately, it is not defined ...
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approximating the density of the studentized range distribution

Is anyone aware of an approximation to the density function for the studentized range distribution https://en.wikipedia.org/wiki/Studentized_range_distribution ? I've found a fast approximation for ...
Brian Powers's user avatar
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Pairwise comparison; Tukey HSD or FDR

I have a general question about running multiple pairwise comparisons. I did some genetic work in grad school, where we (I believe) utilized a statistical test (Student's T-test?) followed by a FDR-...
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How to get the group differences after Bonferroni correction in multiple comparison?

After an ANOVA in R, do you know if it is possible to get the group differences using Bonferroni correction ? If I use the iris dataset ...
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One-way ANOVA F-test is significant but none of the Tukey pairwise test is significant

I made up this example myself: Three geoscientists from China, USA and Europe were interested in exploring the mineralogical and textural characteristics and organic carbon composition of carbonate ...
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R Tukey Anova: Can non-overlapping boxplots share the same letter of significance in Anova / Tukey Test?

I conducted a one way anova followed by a tukey-test in Rstudio and used a compact letter display to add letters of significance to a ggplot. After a positive Grubbs-outlier-test I removed an outlier ...
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Tukey test for glm of catch data and fitting glm?

I have angler catch data from tournaments over 10 years and want to compare the proportion of each species (Sp1 vs. Sp2, Sp1 vs. Sp3, Sp2 vs. Sp3) caught within each year 2005 to 2015. So were more of ...
THATguy's user avatar
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3 answers
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One-way ANOVA for multiple features?

I have 60 continuous features (i.e., lab results) for 35,000 patients, and the patients are divided into three groups. I want to evaluate each feature to find out what the differences are between the ...
Mon's user avatar
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3 answers
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Repeated measures ANOVA with significant interaction effect, but non-significant main effect

I am running a two-way repeated measures ANOVA (main effects: Time, Condition). The result is that the main effect of time is significant (P<0.05), the main effect of condition is not significant (...
Zachary McClean's user avatar
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1 answer
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How to conduct a posthoc test on effect size from linear mixed effect model?

I have a linear mixed effect model with the following output ...
Thomas's user avatar
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1 answer
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How to summarise ANOVA post-hoc Tukey test?

I am having trouble to interpret tukey's post hoc result from the following They incorporated post-hoc test results into a table using the 𝑎≤𝑏<𝑐 style notation (𝑎,𝑏,𝑐,... correspond to ...
jquery404's user avatar
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Interpreting categorical variables with reference level in linear model

I wonder how should I report the results of categorical variables with reference level in linear model? The response variable of my model is Duration (time taken to reach 25C for an animal model). My ...
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Why is my Tukey post hoc test is not significant while my values are visually different?

can anyone help me to understand this. I have data to compare among 3 experiments with 2 treatments each.I want to compare a measured variable between the 2 conditions for each experiment. I first ...
user18309655's user avatar
2 votes
1 answer
92 views

How to determine how much variation was due to the differences between a group?

I am working on the data set that consists of Patients (after stroke), Time (then can walk after a going through the program), and Program they follow. ...
user13696679's user avatar
4 votes
1 answer
902 views

R pairs function, adjust, tukey/tukey-kramer?

In the 'pairs' function when doing pairwise comparisons after emmeans, tukey is set as default for adjustment of p-values. But what type of tukey is used, is it tukey-kramer? How can I know this? If ...
user11916948's user avatar
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Evaluate significance for three different groups not normal distributed with different n

I have a group with three different treatments. One group gets shown 0 Tags, 4 and 7. N's are different in the range of 80-100 and data does not follow a normal distribution. I would also like to ...
Fredyonge's user avatar
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What does p-value = 0.00e+00 mean? [duplicate]

I ran TukeyHSD test on a linear model which gives me a result with some p-value = 0.00e+00. Does this mean the p-value is very small hence it's significant? or there's error? ...
Catalyst's user avatar
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Understanding the difference between linear and interactive terms in Tukey HSD

I have an analysis of a dataset with a factorial design. Currently, I've been doing the analysis in R, using aov and TukeyHSD. I ...
Baraliuh's user avatar
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Tukey HSD Post Hoc test with the Anova() Command (Car-package)

I am trying to do a Tukey-Test with the Anova() command from the car-package. I am using Anova() because I have an unbalanced ...
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Questions about plotting a two-factor anova

I have an experiment where I collected 36 water samples in three different streams (12 samples per stream). Subsequently, I divided these samples into 4 groups (3 samples per group), and treated them ...
Pygoderma's user avatar
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342 views

Multiple post-hoc tests after Multivariate GLM/MANCOVA

I have three groups, where I am doing a multivariate GLM/MANCOVA to test for multivariate differences between groups (6 DVs), adjusting for 2 covariates. I would like to do post-hoc tests to see which ...
ViM's user avatar
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Using ANOVA and HSD, I find A and B are not significantly different from C, but I find A is significantly different from B. What does this mean?

I'm learning a bit about ANOVA and Tukey Range test and my understanding is if there's significance between two samples, they don't come from the same distribution. However, in some tests I'm having a ...
gator's user avatar
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1 answer
881 views

Does $\alpha$ for Tukey change like it does for Bonferroni?

If you are trying to find confidence intervals, how does $\alpha$ for Tukey and Bonferroni differ? I understand that for Bonferroni the $\alpha$ is divided by the number of groups; however, does the $\...
rabito's user avatar
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4 votes
1 answer
4k views

Effect size calculation for One-way ANOVA and Tukey-HSD

I'm calculating the minimum sample size to conduct a One-way ANOVA test that I will follow with a Tukey-HSD post hoc analysis. I'm using software R to do my calculations. From the 'pwr' package, I ...
Numbermind's user avatar
1 vote
1 answer
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One-way ANOVA followed by Tukey test - confidence intervals

I want to test 3 types of treatments (T1, T2, T3) along with a control/placebo treatment (T4). In order to do so, I'm performing One-Way ANOVA to my data and then proceeding to the Tukey test. ...
Numbermind's user avatar
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Testing whether means of several gamma distributions are equal?

I have conducted measurements on bubble sizes on 20 positions in the same foam, each of the 20 positions following a gamma distribution. From the boxplot the mean values appear very similar... Now I ...
Iben Hansen's user avatar
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124 views

Relationship between Q Studentized range and Student distributions

I was looking at the article about Tukey test on Wikipedia regarding the relationship between Q Studentized range and Student distributions and it look like $\sqrt{2} t(1 - \alpha / 2, n-c) = Q(\...
Vika's user avatar
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post-hoc (Tukey) on adonis (permanova) [closed]

I have a bray-curtis distance matrix and found significant associations on a grouping variable with adonis (permanova) using R package vegan. Now I would like to perfrom a post-hoc test to test ...
plicht's user avatar
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4 votes
1 answer
4k views

Unclear why "adjust = "tukey" was changed to "sidak""

I noticed a strange behavior for cld function when making multiple comparisons. When I use cld(EMM, adjust = "tukey") ...
Diego Pujoni's user avatar
1 vote
2 answers
373 views

I got the same adjusted p values (p adj) at different confidence levels (conf.level=0.95 and conf.level=0.90) when I run TukeyHSD in R

I am learning the TukeyHSD in R. The following operations and results got me confused. I got the same adjusted p values at different confidence levels (0.90 and 0.95). Should the adjusted p values ...
Karl Zhong's user avatar
2 votes
1 answer
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Studentized range table - reported paper value does not match table

I'm reading a paper on multiple comparisons (citation below). The paper reports (page 324, step 5) that we need to: "Find the percentage point of the studentized range (SR_n) corresponding to a ...
StatsSorceress's user avatar
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Tukey Test and Linear Regression

Say there are four groups, (a,b,c,d), for one feature in a dataset with many features. I am trying to predict a numerical feature y. I perform the Tukey test and find that the means of y for groups a ...
Morgan Lu's user avatar

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