# bonferroni

1. ### Multiple testing correction - What constitutes a test?

Hello! I am not how to tackle my experimental setup in terms of multiple testing correction: I have three performance measures (m1,m2,m3) that I collected from 20 individuals. On top of that I have two measures of some anatomical feature. I correlated every anatomical feature with all the...
2. ### Asymptotic sig (2sided test) V Pairwise comparision ad. sig

Greetings I just ran a the non-parametric KW test (as independent samples) in SPSS on my data with 5 groups which is not normally distributed and found that the overall Asymptotic sig (2sided test) was 0.025 ergo significant while in the Pairwise comparision ad. sig, no groups were...
3. ### Bonferroni vs. Modified Bonferroni

Hello, I was wondering if anyone knows when it is appropriate to use a Bonferroni correction over a Modified Bonferroni correction? Thanks :)
4. ### Statistical Significance Issue in Mixed Model

A multilevel model, with one explanatory variable at the individual level (X) and one explanatory variable at the group level (Z): Y_{ij}=\gamma_{00}+\gamma_{10}X_{ij}+\gamma_{01}Z_{j}+\gamma_{11}X_{ij}Z_{j}+u_{0j}+u_{1j}X_{ij}+e_{ij} correlation between u_{0j} and u_{1j} is 0 . In this...
5. ### Bonferroni Adjustment/Correction and Confidence Intervals

Hello, I have two questions here. RESOLVED (for now): You perform the bonferroni for multiple tests and/or multiple comparisons. FIRST: I have performed 4 mixed between-within subjects ANOVAs, that look at the differences between time (2 time points) and group (2 groups). I have been...
6. ### Two girls one bonferroni - adjustment according to which families?

Hey guys We are two girls in need of some statistical guidance in our bachelor project in medicine. As it is the easter holidays, our advisor is not available, and the due date is coming up fast... So here’s the deal: We have 17 subjects in a crossover design of three groups: ·...
7. ### What's the correct correction factor? Multiple one-sample and paired tests...

This question concerns the chance of Type I error in hypothesis testing with multiple statistical tests. The data come from a series of experiments. To make it easier to describe clearly, we could consider the experiment as having 3 parameters that could be varied. We could call these A, B...
8. ### post hoc for dependent comparisons

Hello, I have got 7 subjects. We measured their blood pressure at 3 time points before taking a drug, during effect and later on. I carried out a 1-way repeated-measures Anova, tested sphericity, but I do not understand which post hoc test I can carry out. Just paired t-tests reducing my alpha...
9. ### bonferroni correction in multivariate regression

hi, I just read something that made me think about this, the p-values we calculate in a multiple regression have no adjustment for multiple test ( like a Bonferroni correction), right? Does this mean tjat more independent variables I have the more probable it is that I get false positives ...
10. 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...
11. ### Kruskal-Wallis = significant but post-hoc doesn't show any sig results...

Hi everybody, really hoping somebody can tell me if I'm missing something obvious here. I've run a Kruskal-Wallis test on SPSS using the Analyze-Nonparametric-Independent Samples route and the Hypothesis Test Summary box tells me to reject the null hypothesis (sig=.003). However when I double...
12. ### 2-way ANOVA and the post tests

Hi everyone :) I was wondering if you could help me with a question which should be simple... but the more I am trying to figure it out, the more confused I get :confused: I am trying to see the effect of a treatment (so I have a control and treated group) at different time points before and...
13. ### 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...
14. ### Bonferroni correction for bivariate correlation

Hi all, First of all my level of stats knowledge is fairly basic! I am currently running multiple bivariate correlations on data from a number of self report questionnaires. This has resulted in many significant correlations, and my supervisor has suggested I use the Bonferroni correction to...
15. ### Adjustment for multiple comparisons

Hi there I am hoping you can help me out with a confusing topic. I have a 2x3x4 repeated measured anova. I have a significant 3-way interaction, and I want to make sure that I am using the correct post hoc comparisons and not violating any key statistics theory. I have run the statistics...
16. ### How to present data after Holm-Bonferroni Correction

Hi all, I am manually using Holm-Bonferroni method to correct my data as I can't find a way to do it using software. As the data is relatively small, it is still manageable. The problem is how I should present the data after the correction. 1) When the null hypothesis is not rejected as...
17. ### Multiple comparisons of economic game data

Hi, Any help would be greatly appreciated! I am analyzing some data to which I think I need to make some kind of multiple comparisons correction. The data comes from an economic game (Dictator game) and is the form of donations made by subjects ranging from $0.00 to$ 0.50 (can be any \$ 0.01...
18. ### repeated measures anova, post hoc testing

Hi there, I have a 2x4 fully repeated measures design in which participants had to correctly state whether a target was absent or present in a visual field task, with different numbers of distractors. the first independent variable is target presence/absence the second independent variable...
19. ### How to test for group differences in questionnaire responses

The original project involved giving different forms of instruction to three different groups. We also gave participants a questionnaire regarding previous knowledge of the subject, how many college courses they've taken, and how much they liked the instruction formats. Because of group...
20. ### SPSS - Bivariate/multiple correlations: How to run a Bonferroni correction?

Hello, I am new to the forum and have a question regarding running Bonferroni corrections with bibariate correlations within SPSS. To give a brief background to the project: I am developing a psychometric scale and in order to assess convergent validity, have obtained data from N=100+...