bonferroni correction

1. Should I use Bonferroni correction?

Hi. I‘m analzying the influence of Yoga on stress adadption and work related stress. I tested the differences of work related stress between pretest and posttest in the experimental group by a paired t-test. I also tested the differences of stress adaption between pretest and posttest in the...
2. Lilliefors test for paired series + Bonferroni correction

Hi all, I got two series where I want to find out if they differ. The two series are paired meaning they are values for the same subjects. N = 21 After: 0.87348565, 0.88276705, 0.89083918, 0.89520159, 0.89519151, 0.90286579, 0.90586482, 0.90750014, 0.90978787, 0.91008748, 0.91230162...
3. Significant Friedman's test but non-significant post-hoc tests

Hello, I am running a Friedman's test because I want to see if there is any difference in my participants' scores across 4 time-points. My sample is n=51. I ran the test and it revealed a statistically significant difference (p = 0.29). Then I conducted post hoc tests to see where the...
4. How to correct for comparisons between and within groups?

I have two groups - control and treatment - and I'm following response for both groups at 4 timepoints. Data is not normally distributed and I am interested in timepoints where there is a significant difference. To check whether treatment has effect I look at: - whether response to treatment at...
5. SPSS Syntax with Bonferroni Correction for a Simple Effects Analysis

My stats question for my research is: I am running a 2x2x2 mixed Anova, between 2 groups, and with repeated measures for Control-trial (CI versus II) and Distractor-type (PosF versus NegF) to evaluate main effects and interactions on Accuracy. The variables used for control-trial and...
6. Correcting for repeated testing with 4 mediation analyses?

Hi guys, First time poster here, sorry if I post this at the wrong spot or something like that. For my thesis if have the following 4 hypotheses: 1. Emotion regulation (partially) mediates the relationship between cognitive behavioural therapy (CBT) and social anxiety severity. 2...
7. How to do a bonferroni correction after Kruskal Wallis H

Hello everyone! My knowledge in statistics being very poor, I would like to ask for your valuable help! Wanting to check any differences between the anwers given in a 5-point likert type question measuring attitudes towards new technologies and the years of service of teachers (0-5 / 6-10 /...
8. Is a Bonferroni correction needed for my particular dataset?

I received a review of my manuscript in which one of the three reviewers advised that I will need to apply a Bonferroni correction due to multiple comparisons. However, based on the examples I have reviewed, I am not certain that a Bonferroni correction is needed in this case. Here is the...
9. When to use Bonferroni

I am working with a mark-all-that-apply survey question that has 8 categorical response options. I am comparing responses statistically between two groups (dependent variables). 1. Are Bonferroni corrections supposed to be made only when you are comparing multiple groups, or does the number...
10. Testing Parameters of Mixed Model .

This pdf illustrates nicely how is to test the random effect of multilevel model . But I am simulating data from a two-level model and estimating the parameters of the model for various combination of the parameters. For each condition , I generated 1000 simulated data sets. I have used R for...
11. non parametric multiple pairwise comparisons - which correction is allowed?

Hello all, I have a data set from plant experiments with only 4 replicates. data are numbers of mites after different treatments. Because the datasets are small they are not normally distributed, so I use non parametric tests: Wilcoxon. First I did a pairwise comparison, without corrections...
12. Multiple-testing correction in Moderation analyses

Hi Everyone! In an exploratory attempt, I ran 35 moderation analyses (both 2-way and 3-way interactions) of which 7 were significant. NOw the reviewer is warning me about false positives and prompting to run some statistical check that would help to identify those. I tried the conservative...
13. bonferroni corrected p-values pairwise comparisons SPSS

Dear, I am using Linear Mixed Modeling in SPSS. I have a significant interaction between two variables: correctness (2 levels: correct vs error) and condition (3 levels: drug a, drug b, drug c). In order to follow up on the significant interaction I run pairwise comparisons and ask SPSS to...
14. R

Determining ideal sample size, testing normality in SPSS, bonferroni adjustment

Hello all, I am new to the forum. I had a bit of training in statistics and research, particularly statistics in psychology, but I have some basic questions that are holding me back. I would appreciate the help. 1. How can I determine the ideal sample size for a study (upper and lower...
15. Bonferroni corrected comparisons v. post hoc tests

I am running a 2 (gender) x 3 (condition) ANOVA. When I compare the results yielded by the compare main effects option with Bonferroni correction to the results given by post-hoc tests with Bonferroni correction, the results (p-values, estimated differences, CIs) differ. Can someone help me...
16. Kruskal Wallis - Specific multiple comparisons

Dear all, I'm new to the board, but I hope you're able to help me. I'm using SPSS for my statistics. My outcome is scale variables (eg height, weight, etc.) - a total of 20 different variables. I have 8 different groups where I need to test 8 relevant combinations per variable. My first...
17. Controlling for Type 1 Errors: Post-hoc testing on more than 1 ANOVA

I have conducted several repeated-measures ANOVA's with post-hoc testing via Tukey's HSD whenever the omnibus F-test was significant. I'm having some confusion about controlling for type 1 errors when presenting these post hoc tests. Q1: It's my understanding that Tukey's HSD will control the...
18. Does the sequential Bonferroni correction method apply to my data?

The literature on Bonferroni correction methods is confusing me... I have compared means of multiple variables (some dependent, some independent) with Fisher's exact tests, Kruskal-Wallace tests, and Mardia-Watson-Wheeler tests. All in an attempt to identify important variables in the...
19. Multiple comparison problem (one-to-many)-Protein sequence

Dear All, I am new here and this is my first post. I have a problem where I am comparing a set of 9 protein amino acid (AA) sequences (Proteins I am interested in) vs 1000 random of proteins sequence sets 9 by 9. Basically, I am trying to confirm that some AA (e.g. Alanine) are enriched in my...
20. Using factor analysis to avoid Bonferroni death?

Hi! I have a study with three dichotomous IVs and five DVs, which are brief, relatively reliable composite scales derived through factor analysis. If I run 2x2x2 ANOVAs for each of the individual subscales, I get great results, with interactions supporting my hypothesis. However, if I use a...