All Questions
Tagged with bonferroni anova
59 questions
0
votes
0
answers
24
views
Multivariate (two-way/two-factor) ANOVA post hoc tests proper significance calculation method
I would like to get a proper justification for choosing one of the three of the various methods used to determine the causes of interactions in post-hoc procedures for multivariate ANOVA. I have ...
- 333
0
votes
0
answers
53
views
Does the Holm-Bonferroni procedure really correct for FWER in the context of ANOVA?
I wanted to make sure that post-hoc tests with the Holm-Bonferroni procedure behave nominally on typical ANOVA data under the null hypothesis.
To do so, I computed the p-values and FWER obtained from ...
- 123
1
vote
0
answers
66
views
Why is an alpha adjustment not required for factorial ANOVA?
When conducting a 2-way fixed effects ANOVA, there are essentially four null hypothesis statistical tests (NHSTs) that can reasonably conducted with just the ANOVA tables. The first is the omnibus ...
- 6,064
1
vote
1
answer
325
views
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
...
- 169
0
votes
0
answers
46
views
ANOVA: which test is to be chosen when they differ in significance?
I am using the software PAST*.
When running an ANOVA I have available these tests: Tuckey's pairwise, Kruskal-Wallis, Mann-Whitney pairwise and Dunn's post hoc.
I am trying to see if three species are ...
- 31
3
votes
3
answers
301
views
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 ...
- 31
1
vote
1
answer
220
views
Bonferroni (or BH) correction for multiple t-test?
I'm studying the kinematics differences between males and females examined at two different specific walking speeds (slow/fast). Specifically, I'm exploring:
a) slow speed vs high speed (dependent t-...
- 23
0
votes
0
answers
183
views
Kruskal Wallis test or ANOVA for G-mean?
I currently working on the data (4 groups), which requires the evaluation in Geometric means.
I transform the data into logarithms (which is non-normal distributed), then I wonder whether to use ANOVA ...
0
votes
0
answers
61
views
Anova or Bonferroni correction needed?
I've read a bit when it is appropriate to use Anova/Bonferroni correction over multiple t-tests but I am not sure if it applies to my data. I am extracting audio features from themed Spotify playlists ...
- 63
0
votes
2
answers
97
views
ANOVA post-hoc correction question
I am currently analysing data from a recent experiment, in which I will perform a 2 way repeated measures ANOVA (exercise intensity [3 intensities] x time [5 time points]).
I have a significant ...
- 11
1
vote
0
answers
76
views
Need to run Bonferroni correction if only doing 1 paired-samples t-test?
Say I have a significant interaction for a 2x3 within-subjects ANOVA. If I have a theoretical justification for only running a single paired samples t-test to look at simple main effects (even when ...
- 23
1
vote
0
answers
134
views
Am I (reviewer) correct or is the researcher correct re: Bonferroni?
I've been asked to review an article for a low-tier journal, such that I am the only reviewer with stats knowledge (such as it is; I used to teach stats and advanced stats, but it's been a few years ...
- 11
1
vote
1
answer
656
views
Shouldn't the adjusted p value be less than the normal p value?
I am following an SPSS tutorial for Kruskall-wallis test. In the example give, we are comparing the driving reaction time for 3 groups (each group contain 10 subjects) following a drink. 1st grp was ...
0
votes
0
answers
26
views
Calculating alpha level for Bonferroni
I have 4 null hypotheses. I want to conduct 4 two-way mixed ANOVAs (one between-subjects factor and one within-subjects factor) for each of my 4 dependent variables. I will use the same between-...
- 33
2
votes
1
answer
21
views
Difficulties in choosing a correct test for the analysis of variance e then a multi comparison test
I have these groups :
...
- 141
1
vote
0
answers
665
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)...
- 21
1
vote
0
answers
108
views
Multiple testing between treatment groups, and between subgroups within treatments. Bonferroni correction required?
I have a data set that is structured such that I have four treatment groups with 6 samples each; 3 samples in each treatment were taken at an early time point, and the other three were taken at a ...
- 13
2
votes
1
answer
428
views
Is there any consensus on adjusting p-values for multiple tests?
I'm confused as to when adjustments for multiple tests need to be used. I'm an undergrad who's familiarising himself with stats, so apologies if my question sounds dumb, but I haven't found any ...
- 21
0
votes
1
answer
1k
views
Bonferroni Adjustment to Multipe Comparisons AND Multiple ANOVA's
I'm running four one-way ANOVAs using a different DV each time. Each ANOVA has one DV and four IV condition levels. I currently have each ANOVA set up in a different data file. I would have liked to ...
0
votes
2
answers
424
views
Bonferroni correction in one-way ANOVA for one dependent variable
I have a quick question I hope somebody could help me with;
If I have two one-way ANOVA's in my research just comparing the means of three age groups for a single dependent variable (so two seperate ...
- 25
0
votes
1
answer
211
views
A one-way ANOVA for multiple comparison
Cheng, H., & Liu, S. (2019). Haptic Force Guided Sound Synthesis in Multisensory Virtual Reality (VR) Simulation for Rigid-Fluid Interaction. In 2019 IEEE Conference on Virtual Reality and 3D User ...
- 1
0
votes
2
answers
166
views
Multiple comparison adjustment with multiple outcomes, measured over time
I am trying to work out the most appropriate way to adjust for multiple comparisons.
I have 20 biomarkers which have been measured at 4 timepoints (baseline & three unevenly spaced follow-ups). I ...
0
votes
1
answer
2k
views
Significant main effect but no interaction which post hoc test to do?
I have an experiment looking at the effect of rearing condition on development of the number of neural networks (ensembles) in mice. I therefore have two factors (Age 3, 5, 7 dpf) and Rearing ...
4
votes
1
answer
77
views
Considering pre-tests in family-wise error correction doing an ANOVA
When I do multiple tests on a dataset, I need to correct for the family-wise error (e.g. using Bonferroni method when performing multiple pairwise t-tests). If I do an ANOVA, I need to make sure that ...
- 41
1
vote
0
answers
155
views
3 way ANOVA / Duncan test
I am runnig 3 way ANOVA between: specie * organ * treatment in Sucrose acumulation.
There is interaction between organ*treatment, but no interaction between specie and organ or treatment.
Should I ...
2
votes
1
answer
3k
views
Is it necessary to do a Bonferroni correction on a) exploratory analysis b) correlations or c) if there are 3 different dependent variables
My study is a 2x2 within design and I have a series of 8 hypotheses. These include one ANOVA , one t-test and 4 Pearson correlations. However, the ANOVA and 3 of the correlations include the same ...
- 61
1
vote
1
answer
2k
views
Pairwise comparisons after ANOVA with Tukey and Bonferroni methods in r
The built-in functions TukeyHSD and LSD.test from R perform pairwise comparisons. In order to maintain the type I error, the significance level $0.05$ is divided by the number of comparisons $k$. Do ...
- 11
1
vote
0
answers
266
views
FIsher's LSD test is appropriate for restricted mean comparisons
Suppose that we perform two way ANOVA with interactions, with factors $A$ and $B$ with three level each $A_{1},A_{2},A_{3}$ and $B_{1},B_{2},B_{3}$.
We know that Fisher's LSD test is used for ...
- 85
1
vote
0
answers
169
views
How and when to use multiple comparison tests
There seems to be some variability in WHEN multiple comparison tests such as Bonferroni or FDR might be implemented.
Type 1: One might carry out multiple one-way ANOVA's to see whether or not there ...
- 423
0
votes
1
answer
147
views
Correcting for multiple tests over time
I am measuring degradation of RNA over time with a control and a treatment. I have % RNA remaining (relative to time 0 for control and treatment) and 5 time points. I would like to test if the % ...
- 1
1
vote
1
answer
3k
views
Correcting for multiple comparisons after multiple ANOVAs
I've had to run 5 different ANOVAs (identical 4-way mixed design ANOVAs including the same factors, but on a different dependent variable [a gait parameter] each time). In this case, what would be the ...
- 11
2
votes
2
answers
2k
views
Bonferroni correction in planned contrasts
I have 1 continuous DV and 1 categorical IV with 4 levels. I set up orthogonal dummy coding for 3 planned contrasts. I then used the linear model to observe if the planned contrasts are significant.
...
- 59
1
vote
0
answers
81
views
Does a Split File Datasat need a correction for multiple comparison?
I searched already for similiar problems but couldn't find an answer.
I split the file in SPSS by a two-level between group variable (sequence) and then want to perform two ANOVAS on each of those ...
- 11
1
vote
0
answers
185
views
Should I use t-test or ANOVA+post hoc (two different treatments and a control)
I have been working with ice algaes,and Im looking on their fattyacids.
Here is a bit about the experimental design.
I have one treatment area, cleared, where I have removed all snow.
I have ...
- 11
1
vote
1
answer
1k
views
post hoc tests in ANOVA
While I am doing post hoc test for one way ANOVA, I am getting significant results for LSD but the same variables does not have significant values for Bonferroni. Why is it so?
4
votes
0
answers
785
views
a priori power analysis for ANOVA plus post hoc test
I would like to perform an a priori power analysis to calculate required sample size for data to be analyzed using one way ANOVA and Tukey HSD post hoc test. (I want to determine pair-wise which ...
- 181
3
votes
2
answers
482
views
Is Bonferroni correction used for multiple levels, multiple factors, or both?
Bonferroni correction can help us correct our alpha values in multiple statistical testing.
One aspect that I am confused on: Is Bonferroni correction used when we have multiple levels (Does this ...
user46925
3
votes
0
answers
106
views
Difference between one-way ANOVA and all pairwise comparisons with Bonferroni correction [duplicate]
If you have five groups and you wish to know if there is a significant difference between any of the group means, you would have to do 10 pairwise comparisons to test all possible pairs of means. You ...
user46925
0
votes
1
answer
458
views
How come we have Bonferroni correction when we have ANOVA analysis?
ANOVA analysis can be used to determine the significance of multiple groups. Why do we need Bonferroni correction to re-compute the alpha values?
ANOVA solves the problem of multiple testing by ...
user46925
3
votes
1
answer
159
views
Why do I need a Bonferroni correction if we are evaluating our primary outcome?
We have completed a study comparing control with vitamin D supplement and with bone building drug. The primary outcome is change in bone mineral density. My statistician states that because we are ...
2
votes
1
answer
6k
views
Repeated Measures ANOVA and the Bonferroni post hoc test different results of significantly
I am doing an Repeated Measures ANOVA and the Bonferroni post hoc test for my data using R project. The ANOVA gives a significantly difference between the data but not the Bonferroni post hoc test.
<...
- 173
1
vote
1
answer
112
views
Do I need to use a Bonferroni adjustment?
I am using three different ANOVAs to determine significance across two treatment levels. Because we only have two species I chose to run the same set of analyses for each of the species instead of ...
- 33
10
votes
3
answers
5k
views
Is there a consensus on adjusting alpha for multiple contrasts if the main effect is significant?
After talking to a couple of statisticians, reading some book sections, internet articles, and forums like this, I am still unclear about multiplicity adjustments of post hoc tests and contrasts.
Let'...
- 131
5
votes
2
answers
760
views
Bonferroni method for multiple comparisons with 1-way layout
My statistics book describes the Bonferroni method of doing multiple comparisons with a one-way layout as essentially performing a t-test with each pair of interest with a significance level scaled ...
- 261
4
votes
0
answers
3k
views
How to best approach ANOVA with multiple response variables that might be correlated and Bonferroni Correction
I need some help verifying a simple analysis. I have completed a simple two factor experiment of more or less equal sample sizes. Let's assume for the case of this question that the sample sizes are ...
- 141
5
votes
1
answer
1k
views
Why is the Bonferroni correction properly used with planned, and not post hoc, contrasts?
The Wikipedia article on Post hoc analysis says "Bonferroni correction (This is properly used with planned, not post hoc, contrasts.)" but does not explain why the Bonferroni correction is properly ...
25
votes
4
answers
44k
views
Is Fisher's LSD as bad as they say it is?
When we perform experiments (on small sample sizes (usually the sample size per treatment group is about 7~8)) on two groups, we use a t-test to test for difference. However, when we perform an ANOVA (...
- 587
3
votes
1
answer
9k
views
When should I use FDR or Bonferroni in multiple comparisons?
I have the following situations :
(1) Very large number of variables - say 100 variables and 200 samples (observations). Although level of each variable is just 2 or 3 or 4 max. I am doing linear ...
- 2,268
1
vote
2
answers
125
views
What are correlations among between test statistics in multiple comparison procedures
In the book Multiple Comparisons Using R Bretz et al write that their R package multcomp improves power above other multiple comparison procedures by "accounting for the structural correlations ...
- 2,173
0
votes
1
answer
4k
views
Bonferroni-correction after one-way ANOVA
I conducted a one-way ANOVA: I had two groups and tested, if they differ in three different DVs.
Since I tested three times, I thought it was wise to go for Bonferroni-correction. But then I got the ...
- 89