bonferroni correction

  1. M

    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...
  2. C

    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...
  3. A

    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...
  4. A

    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...
  5. Y

    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...
  6. C

    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 /...
  7. S

    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...
  8. N

    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...
  9. C

    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...
  10. J

    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...
  11. R

    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...
  12. D

    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...
  13. 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...
  14. L

    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...
  15. P

    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...
  16. F

    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...
  17. B

    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...
  18. M

    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...
  19. E

    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...
  20. Z

    Mann-Whitney U and Bonferroni Correction

    I recently presented some work in my department in which my colleagues and I had applied a Mann-Whitney U test for multiple pairwise comparisons. We used a Bonferroni-adjusted alpha for the test. After my presentation, a guy generally considered to be a statistics whiz told me that the...