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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Tukey for polr or clm object [closed]

I'm trying to do a Tukey test with the function HSD on a polr or clm object but it doesn't work could somebody help me Thanks
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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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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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15 views

Should I use Tukey's test or Bonferroni?

Should I use Tukey's test or Bonferroni as post hoc test for repeated measures ANOVA? I appreciate your reply. /Michael
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1answer
33 views

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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11 views

When there is no interaction, can I use multiple comparison such as LSD or Tukey test?

I have three factors - Genotype (5 levels), Nitrogen (2 levels), and manipulation (2 levels). I'm interested in the combination of three factors. I'd like to check how average grain weight responds to ...
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1answer
16 views

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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Multiple Testing Correction with One-Way ANOVA + TukeyHSD

I have a conceptional question about multiple testing correction when using many one-way ANOVAs followed by a Tukey HSD in a biological setting. I know that similar questions were asked before, but I ...
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1answer
43 views

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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GLM with binomial function in R with Tukey HSD comparison

I need help to calculate the binomial function using glm model in R for the below data can anyone help me to find how to arrange data commentary and analysis codes.
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Tukey pairwise grouping after 2-way ANOVA

I have a dataset like this, ...
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1answer
59 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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189 views

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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93 views

Why do I get different results for Tukey HSD compact letter comparisons with different R packages?

I have a dataset that I have been trying to run Tukey HSD tests on and obtain a compact letter display. I originally used the agricolae package with function ...
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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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1answer
40 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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1answer
453 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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53 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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Determining Significance in AxB Anova with repitition

I am looking to understand how the best method of determining the individual significant between my interactions would be calculated in a Two Way anova with repetitions. Based on the results of the ...
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To read a Tukey result for a GLM model

Here is the Tukey test result I get after interpreting a model, but I'm not sure what it means, can someone help, please? Thank you so much! Here's the result interpretation:
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611 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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45 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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62 views

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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208 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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1answer
2k views

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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793 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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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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1answer
149 views

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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149 views

How can I compute a confidence interval on Cohen's d derived from a Tukey HSD contrast?

Question Background Consider for example that I have some data arrayed as a 1-way (Group: A, B, C, D) between groups ANOVA. Consider further that I am interested in all possible pairwise contrasts ...
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1answer
1k views

Calculate Cohen's d for pairwise tukey tests in a 1-way ANOVA

I have the following dilemma: Design: 1 (Group: Patient vs. Control_1 vs. Control_2) between-factors design arrayed as a 1-way ANOVA Analysis: Following a main effect of group perform I perform all ...
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1answer
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Are there any situations where ANOVA performs better/is more useful than Tukey's HSD?

In statistics this week we are learning about ANOVA and Tukey's HSD. If ANOVA only tells you whether the differences in the means of the groups are significant, but Tukey's HSD gives you the ...
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50 views

Multiple comparisons from means and standard deviations

I am attempting to do a statistical comparison of the mean concentrations of certain ingredients between different varieties of a product, based on summary data. An example table depicting the type ...
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2answers
237 views

How to select the best variant from an A/B/C test?

Suppose I've run an A/B/C experiment (same as A/B but with 3 groups instead of 2) and gathered the following data for number of participants in each group and number of desired actions in each group (...
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1answer
132 views

Using pairwise comparision on gls object [closed]

I have one factor (tree genotype) and I analyse its influence on soil content. I used gls to aply weights on my data because it's a better fitted model. Here is an exemple of my data with one ...
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1answer
55 views

Splitting groups for statistical comparisons

I have a question that I cannot answer based in my biological background. I conducted one experiment with 5 replicates and 4 treatments. There were two goals: the first goal was to elucidate if our ...
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1answer
32 views

Tukey Kramer and the reduction of type one error

I hope everyone is doing well. I understand that the Tukey Kramer reduces the chance of getting a type 1 error by using a pooled variance. That pooled variance then gives you a lower standard error ...
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1answer
433 views

TukeyHSD p-value is less than t-test p-value

I have some data where when I do t.test for a specific pair of groups, the p-value is (barely) higher than when I do TukeyHSD ...
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1answer
2k views

How to calculate Tukey-adjusted p-values for emmeans pairwise comparisons?

I would like to calculate Tukey-adjusted p-values for emmeans pairwise comparisons. I know that these can be obtained directly with functions like pairs() and CLD(). However, when there are three ...
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2answers
64 views

Multiple comparison problem

If I conduct 19 tests (e.g. 19 pairwise comparisons of treatment means in an experiment), what is the probability that I will find at least one P value < 0.05 due to chance alone? With number of ...
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1answer
359 views

Anova of a mixed effect model (lmr) shows no significant interaction while tukey (emmeans) does?

I have run a linear mixed-effects model using lmer package. I'm using year sampled (1990s or 2017), field(1967 or 1984), and treatment (open or closed) to determine differences in native herbaceous ...
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Interpreting a Tukey - Kramer Confidence Interval Plot

In order to see if any statistically significant differences in the means of 4 particular diets exist, a post-hoc test is conducted i.e. Tukey – Kramer. Could someone please explain to me the plot ...
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819 views

Using pairwise comparison on gls object with heterogeneity of variances?

I'm comparing total yield from fields under 5 different treatments. As you can see, the variance differed between the treatments (diagnostics from lm() fit): So I ...