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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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. ...
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3 votes
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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 ...
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Reporting multiple one-way ANOVAs concisely

I am writing a report on my findings. I have used an ANOVA test on 15 different dependent variables. The dependent variables are execution times of some processes. I considered the variables ...
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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 ...
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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? ...
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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 ...
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Post-Hoc test for multiple comparison when there are two control group (cancer research)

I would like to give some context, I have 4 experimental groups: A.- Control ( or tumor free) B.- Control + Drug C.- Tumor D.- Tumor + Drug What would be the correct post hoc test ? My interest is in ...
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Bonferroni correction on ANOVA - Tukey HSD - T-test sequence

I ran ANOVA to check for association between categorical and numerical variables and followed it with Tukey HSD to find the pairs that were significantly different and then followed with t-test to ...
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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 Dataset. A statistic professor from my Uni told me Anova() would solve ...
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anova tukey posthoc writing up result

I am writing up Tukey posthoc result and comparing conditions A, B, C. The test shows that A and B are both significantly higher than C. However, how can I write that in one sentence? Originally, I ...
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Interpretation of Tukey's test in R

For the output from Tukey's test, there is a significant difference in both epochs and edited levels. In the edited levels, eg for edited_1 no aug, is it comparing ...
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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 ...
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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 ...
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Comparing group differences in within-subject design: Confidence interval around effect size (Cohen d) or with Tukey post-hoc test (after anova)?

I want to compare 4 different conditions of the same task. Dependent variable is “Draws-to-Decision” (number of draws, until a person decides for one of two options). Independent variable is the type ...
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Repeated measures ANOVA when you're only interested in one level versus all other levels

Suppose I have data (values omitted) like this: Patient Sex Timepoint 1 Timepoint 2 Timepoint 3 Timepoint 4 Timepoint 5 Timepoint 6 A M . . . . . . B M . . . . . . C M . . . . . . D M . . . . . . ...
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Report significance from Tukey HSD

i run a Tukey HSD test inside the R package agricolae and got significant differences between my groups. Now I would like to report that in a figure with the basic ...
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Comparing segregation of populations

I am trying to work through some data and statistical analysis a predecessor has already done. I have two populations of n individuals that were evaluated multiple times in multiple years. So every ...
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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 ...
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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 $\...
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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 ...
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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. ...
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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 ...
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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(\...
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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 ...
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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") ...
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1 vote
2 answers
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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 ...
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1 vote
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 ...
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1 answer
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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 ...
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1 answer
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How do I interpret these colored bars and T's in this Tukey's HSD Plot?

This shows a box plot of value distributions for several variables. I know that the letters indicate plots that are too similar to distinguish at a 95% confidence interval. What do these ...
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320 views

Is the "mvt" (using the multivariate t distribution) accepted way of adjusting for multiple comparisons when reporting to journals?

I use the awesome package multcomp and emmeans in R. These are the places I heard about the "mvt" method for the first time. And, however, it is what it's actually done in the Dunnett or ...
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Tukey hsd test vs DMS test

I am analyzing the differences on my dataset. This dataset has different values according to each group (called season_sized). I have no normality and heterocedasticity, so I performed a GLM to fit my ...
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ANOVA F-test shows significant differences among treatments, but HSD.test does not: What is the reason for this discrepancy?

I am working with a dataset (in R) that has been hierarchically-clustered into three distinct clusters. My goal is to conduct a one-way analysis of variance to see if there are any statistical ...
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Comparison Circles algorithm in Python

My goal is to visually represent similarities between groups using the comparison circles algorithm described here: https://docs.tibco.com/pub/sfire-analyst/7.10.1/doc/html/en-US/TIB_sfire-...
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How to select lines within Tukey's test result?

This mays be a dumb question, but I'm kinda of stuck. I've got a .csv data files organized in Year, Month, Day and Likes helping me analyze my Instragram account (yeah I'm a bit bored but basically I'...
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Post hoc test after Chi square, please advise

I am analyzing a questionnaire survey data about online learning receptibility across different age groups. I have 4 age groups, and each has its % acceptance of the online learning susceptibility. ...
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Comparing different samples from different years: ANOVA?

I have been collecting data for 10 consecutive years. Once in each year different participants (N=110/Year) had to rate the importance of each one of 30 different social values, on a Likert scale (1-5)...
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Why is the Tukey method not appropriate for covariance analysis when estimating treatment effects?

In the book 'Applied Linear Statistical Models' chapter 22 it states that the Tukey method is not appropriate for covariance analysis. The context is in estimation of treatment effects. Instead, when ...
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1 vote
1 answer
165 views

Strange output for pairwise comparisons on glm with quasi-binomial distribution

I'm new to CrossValidated - I've read up on how to ask questions properly but sorry if I do anything slightly wrong. My data is showing whether microplastics were present or absent in the gut of fish ...
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5 votes
1 answer
1k views

Anova and Tukey HSD vs Linear Regression

When analyzing the difference in means between $k$ groups, a one way ANOVA is equivalent to a simple linear regression with indicator variables for group membership $$ Y = \beta_0 + \beta_1X_1 + \...
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208 views

anova and tukey reporting

I have an ANOVA with a numerical score as the DP and a category as an IV: model = aov(score~group, data = dat) And then I run a Tukey: ...
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Statistical question about ANOVA, Tukey and t-test (also R-related)

I am new to statistics and have to do some analysing for a beginner project. However, I am so confused right now and have nobody that I can ask. About the project experiment: We conducted a between-...
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2 votes
2 answers
3k views

Do you need to adjust p-values after Tukey's HSD? How to do this correctly?

I have multiple sets of comparisons I am running together. Normally I would do an FDR correction on the p-values to control the family-wise error rate. However, the p-values from a Tukey HSD are ...
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148 views

Checking ANOVA for unbalanced data

I would like to figure out if there are significant differences between the following groups. I use R: ...
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Differences between years in time series data

I have a multiyear time series dataset detailing the concentration of environmental contaminant over time. and I need to determine if there is a significant difference between the yearly means. In ...
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1 answer
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Why is one mean not significantly greater if every element is greater than the other group?

the mean of group C and every element in group C is greater than its row-wise peers. Why is the Tukey comparison giving insignificant P-values? ...
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6 votes
2 answers
393 views

ANOVA: life after rejecting the null hypothesis

I have multiple groups of data (20+ groups) and test the null hypothesis that they have the same mean. How do I proceed after the null hypothesis is rejected? What is the standard method for selecting ...
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3 votes
1 answer
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Does R use Tukey or Tukey-Kramer test corrected for unequal sample size and does it use the multivariate t distribution?

Does R use the classic Tukey HSD test for balanced data or corrects for unbalanced ones with the Tukey-Kramer approach? I mean the stats::TukeyHSD(). I found, that the Dunnet procedure uses ...
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2 votes
1 answer
2k views

How is the standard error used in calculating a Tukey HSD defined and calculated?

I am looking at someone else’s published data where they report treatment means and then a single standard error value across treatment means. I want to know if certain treatments are significantly ...
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-1 votes
2 answers
4k views

How do I report results from a Tukey post hoc analysis? [closed]

I examined all possible comparisons in the Tukey test (here is the chart - sorry it's a little unclear) https://scontent.fybz2-1.fna.fbcdn.net/v/t1.15752-9/...
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1 answer
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Default multiple comparison correction in TukeyHSD in R? [closed]

Does anyone know what the default method is for adjusting for multiple comparisons is in the TukeyHSD function? (e.g. BH, Bonferroni, etc.)
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