Questions tagged [tukey-hsd-test]
Tukeys Honest Significant Difference (HSD) is a multiple comparison method based on the studentized range distribution.
223 questions
2 votes
1 answer
101 views
Why does cld() in emmeans switch Tukey to Sidak when comparing adjusted means?
I have a model with two predictors, Group (main factor), and Age (covariate). ...
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1 vote
1 answer
89 views
Is it necessary to adjust the p-value for multiple dependent variable hypotheses-tests even when I'm using Tukey?
So, supposing I'm carrying out a field experiment (agricultural data), and I'm interested to understand how four plant genotypes affect three dependent variables (yield, height, and number of leaves). ...
4 votes
1 answer
104 views
Differences in output using mcp option to calculate Tukey confidence intervals in glht
I have a question about the results of a Tukey-Kramer confidence interval calculation using glht with mcp on a linear model adjusting for a few covariates. You can see the model below. I have run glht ...
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0 votes
0 answers
114 views
Can I use the function HSD.test as a post-hoc test for two-way ANOVA in R?
I've done two-way ANOVA with interaction (edit) and now I want to do a post-hoc test. I have 2 factors and both have just 2 categories. I've found the function HSD.test from agricolae package and I ...
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1 vote
0 answers
60 views
Post-hoc Analysis whith interaction but no main effects
I am reviewing a scenario where I have two factors (insecticide, herbicide) each with two levels (absent, present). There is no main effect for insecticide or herbicide, but there is a cross-over ...
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1 vote
0 answers
38 views
What type of test should I run my data
Good day, I have some data I am trying to analyze and want to make sure I run the appropriate test. My data consists in a set of samples which I inoculated with a pathogen in different days (I named ...
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2 votes
2 answers
203 views
What is the best statistical analysis to analyse significant differences in different metabolites over time (time 0,24 and 48 hours)
I have 40 different metabolites where I measured their concentration at time 0, 24 and 48 hours. I would like to know if there are significant differences over time in each metabolite. I am not ...
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0 votes
0 answers
69 views
Does running individual Tukey tests makes a difference or should I treat my simple as a multiple comparison in only one Tukey test?
Hi I need to run Tukey analysis to compare the quantification of 30 metabolites using 3 different types of hydrolysis (lets say hydrolysis A,B and C). so I am thinking in running 30 separate Tukey ...
- 51
2 votes
1 answer
195 views
Permutest or TukeyHSD for group-wise comparison after significant Anova of betadisper?
I want to perform a PERMANOVA with my community-data of spider assembladges, sampled in different forest stands. Before applying PERMANOVA I wanted to find out if there is a difference in the ...
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0 votes
1 answer
85 views
Are these the correct statistical tests to use for my data? Count data for 9 behaviours in 3 age groups
I was hoping you would be able to help me double check if I am using the right tests. I performed focal studies on 36 deer collecting both the frequency and cumulative time expressed (in seconds) for ...
1 vote
1 answer
287 views
Strange output for glmmTMB and pairwise comparison
I am running a glmmTMB to see if there is a significant difference in survival to the eyed egg stage (proportional data between 0 and 1) depending on what genetic male type was used (W, YY, or F1) to ...
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1 vote
0 answers
103 views
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 ...
- 361
0 votes
1 answer
101 views
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 ...
0 votes
0 answers
123 views
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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2 votes
1 answer
172 views
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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