Questions tagged [tukey-hsd]

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

Filter by
Sorted by
Tagged with
1
vote
1answer
19 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 ...
0
votes
0answers
9 views

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.
25
votes
1answer
66k views

Comparing levels of factors after a GLM in R

Here is a little background about my situation: my data refer to the number of prey successfully eaten by a predator. As the number of prey is limited (25 available) in each trial, I had a column "...
0
votes
0answers
28 views
0
votes
1answer
31 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 ...
1
vote
1answer
291 views

How does number of treatments affect ANOVA/Tukey-HSD results?

My data contains 3 treatments: A (n = 10), B (n = 15) and C (n = 5). I run an ANOVA test and reject the null hypothesis, so I perform a Tukey-HSD post-hoc test and find that there is a significant ...
0
votes
1answer
355 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 ...
1
vote
0answers
24 views

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 ...
3
votes
2answers
179 views

Why “Honestly” in Tukey's Honestly Significant Difference (HSD)?

Why is the word "Honestly" in "Tukey's Honestly Significant Difference"? It seems unusual. Most statistical procedures are developed with the intent to give an "honest" answer. Why is that word ...
-1
votes
2answers
1k 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/...
0
votes
0answers
16 views

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 ...
1
vote
0answers
23 views

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-...
1
vote
0answers
13 views

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'...
0
votes
1answer
88 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. ...
0
votes
0answers
62 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 ...
1
vote
0answers
49 views

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)...
1
vote
0answers
30 views

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 ...
1
vote
1answer
33 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 ...
0
votes
1answer
38 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: ...
2
votes
1answer
273 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 + \...
0
votes
0answers
31 views

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-...
0
votes
0answers
15 views

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 ...
0
votes
0answers
22 views

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:
0
votes
0answers
11 views

Conflict in Tukey's HSD value

I have run post hoc mean comparison analysis by augmentedRCBD() command in R. Results are as follows: ...
0
votes
0answers
16 views

ANOVA testing for User Activity on a website

Problem: I am trying to determine whether visitors on a web-site are more likely to perform a certain action (click a specific button in this case) if they view a specific section on the website. I ...
0
votes
1answer
37 views

Checking ANOVA for unbalanced data

I would like to figure out if there are significant differences between the following groups. I use R: ...
0
votes
0answers
8 views

Tukey's HSD over hundreds of variables

I have a list of conversations taking place between two people. I am counting the number of overlapping words at varying points in each conversation. This has given me a long list of numbers (5500 ...
1
vote
1answer
3k views

Interpreting compact letter displays and Tukey multiple comparisons from glmm

I am conducting Tukey HSDs with compact letter displays on a series of glmms. One example is how the presence/absence of ticks on an animal varies based on several parameters (using ...
1
vote
0answers
27 views

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 ...
6
votes
2answers
196 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 ...
1
vote
1answer
685 views

Could I use Tukey's HSD test as a post-hoc test for a within-groups ANOVA test?

I understand Tukey's HSD is the most common post-hoc test for between-groups ANOVA. It appears some do not recommend or select it as a post-hoc test for within-groups ANOVA. Instead, they prefer ...
0
votes
0answers
5 views

What test adapts to this situation

Hello im trying to use sigmaplot and do a one way ANOVA and a comparison to a control group this is to a problem of an enzimatic production by the same organism in prescence of a drug at diferent ...
0
votes
1answer
59 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? ...
1
vote
1answer
54 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 ...
2
votes
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 ...
1
vote
1answer
579 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 ...
0
votes
1answer
100 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.)
0
votes
1answer
315 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 ...
1
vote
1answer
1k views

R Tukey HSD Anova: Anova significant, Tukey not? [duplicate]

i created a simple anova with three groups in R and get a significant Result. After that i do a Tukey HSD Test and now nothing is significant. How can that be? Pr(>F): 0.0316 Group | p adj 1 - 2 ...
6
votes
1answer
13k views

Are pairwise Wilcoxon tests a valid non-parametric alternative to Tukey's HSD test?

I am trying to identify significant differences between groups from normal and non-normal distributions. When the distribution is normal the workflow is pretty straightforward: ANOVA and after that a ...
2
votes
0answers
128 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 ...
18
votes
2answers
144k views

How do you write up Tukey post-hoc findings?

What is the proper way to write a Tukey post-hoc result? There are several examples with different results? Say you have North, South, East and West. ...
2
votes
1answer
2k views

How to interpret grouping result in Tukey's HSD test

Assuming there are three methods to kill bugs, and we want to know whether their performance differs. The Tukey's HSD test gives the following grouping results: ...
1
vote
1answer
4k views

Tukey's test on two way ANOVA

So I have done a two way ANOVA, and would like to do a post-hoc Tukey's HSD test. What should I use for the $k$, SE, degrees of freedom and what is my $q$ and HSD? The exp is done in 4 places with ...
0
votes
1answer
945 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 ...
2
votes
1answer
36 views

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 ...
0
votes
0answers
31 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 ...
2
votes
2answers
180 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 (...
0
votes
1answer
1k views

Tukey HSD plot_simultaneous - how does it work?

I have performed a Tukey HSD in Python. I am not sure what values are plotted when using the .plot_simultaneous() command (see statsmodels documentation). The resulting plot is: I am wondering: how ...
7
votes
3answers
16k views

ANOVA results do not match post-hoc Tukey test, how to proceed?

There has been some discussion about why differences exist between factor significance after an ANOVA and no significance in the pairwise comparisons, and it has been very helpful. However, there is ...