All Questions
10 questions
6
votes
1
answer
100
views
Which family-wise correction is needed for one-sided t-tests in a randomized controlled trial with several independent measures across groups?
I conducted a randomized controlled experiment with groups $A$, $B$, $C$, and $D$, each containing around $40$ human participants who saw one of four variants of a website. Group $A$ saw a baseline, ...
- 161
6
votes
3
answers
2k
views
How to correctly do a nested test (t-test, rank-sum, etc)
Let's say there are two groups of participants. Each group is randomly split into control subgroup A and task subgroup B. For each of the 4 cases some random variable $x$ is measured, whose mean is ...
- 2,131
0
votes
0
answers
34
views
Multiple comparison when testing one planned hypothesis
I am running one logit model containing an interaction:
logit dv year contract_type yearXcontract+Z
where contract_type and year are dummies with 4 levels.
After ...
1
vote
2
answers
94
views
Do I need to use Bonferroni correction?
I have a dataset containing the selling price of mineral stones that were sold in five different countries (namely Germany, France, Italy, Belgium and Spain). I am running multiple t-tests check if ...
- 71
0
votes
0
answers
35
views
Do I need to "correct"?
I am testing whether a certain learning intervention affects student achievement. I have two groups of students (control and experimental) with 16 students each. I have their pre-test and post-test ...
2
votes
0
answers
927
views
Run multiple T-test and correct for multiple comparisons [closed]
I have tried to look for a quick way to solve this questions but I have found no complete solution so I decided to post the question.
I have a dataset about the rate of heat gain on four types of ...
10
votes
4
answers
21k
views
Many p-values are equal to 1 after Bonferroni correction; is it normal?
I have behavioral data for 10 animals that I studied at two different times of day, AM and PM. I am looking to see if there is a significant difference in 8 different behaviors at AM vs. PM. I have ...
- 101
1
vote
2
answers
2k
views
Multiple t-test and Bonferroni correction
I have 11 subjects and also have the percentage value for the accuracy of a method I developed to predict future actions for each individual. I want to use a right tail one-sample t-test to find out ...
- 31
2
votes
1
answer
277
views
Does the bonferonni correction change the outcome of the p-value or is it just changin what you accept as significant?
For some reason I can't seem to integrate the bonferonni corrected p adjustment into my multiple comparisons t test in r so I need to do each of my 3 tests individually.
What I wondered was do I need ...
- 21
8
votes
2
answers
22k
views
p-value correction for multiple t-tests?
My dataset consists of $n$ genes, each of them described by a vector of expression values, $5$ for "healthy" individuals, and $5$ for "unhealthy" individuals.
I am going to run $n$ t-tests (one for ...
- 251