Tagged Questions
0
votes
0answers
42 views
Statistical test for multiple comparison with dependent observations (MATLAB)
I want to use matlab to perform a statistical test to find if there's a significantly higher mean return in any of n different sample populations. However, I can only find post hoc (although they can ...
1
vote
1answer
68 views
Multiple hypothesis testing and F tests?
Does the multiple hypothesis testing problem apply to the calculation of an F statistic for joint significance? It seems to me that the more variables you are including in your test for joint ...
1
vote
0answers
46 views
3 groups of 8 with a different treatment each, over 45 minutes - confused as to stats test needed
I have three experimental groups. Each will provide a 15 minute baseline before an addition of either drug A, drug B or a saline control. Each group has an N of 8 as maximum, but possibly as low as 6 ...
0
votes
2answers
1k views
How can you have a non-significant multiple regression model w/ significant predictors? [duplicate]
Possible Duplicate:
Not-significant F but a significant coefficient in multiple linear regression
How can a regression be significant yet all predictors be non-significant?
Significance of ...
4
votes
4answers
325 views
Practical significance, especially with percents: “standard” measure and threshold
I, like many people, dislike statistical significance testing. I would much rather measure "practical significance" / effect size.
The problem is that I do not know of a "standard" way of doing so. ...
1
vote
1answer
142 views
Alpha correction in a family of tests
Suppose that one runs 8 correlation analyses but in two separate batches: Would the alpha-correction apply to all 8 tests as a family or each of the 4 tests as a family?
For example, if there are two ...
0
votes
2answers
120 views
Probability of accidentally producing significant results
I have a problem, which I think should be very common, but I mostly have been taught stochastic at university and most of my statistics knowledge is self-taught. Hence I have no clue on how to look ...
4
votes
2answers
177 views
Multiple comparisons for parameter significance in a sparse high dimensional regression model
I have a regularized linear regression model with a large number of parameters (~100,000) that has been optimized using a sparse fitting algorithm (coordinate descent with early stopping). The model ...
2
votes
0answers
107 views
Statistical significance for correlated significance tests
I refer to this article http://www.scientificamerican.com/article.cfm?id=the-mind-reading-salmon.
Is there a p-value equivalent for a set of significance tests, especially in the case where some of ...
3
votes
2answers
5k views
Threshold for correlation coefficient to indicate statistical significance of a correlation in a correlation matrix
I have computed a correlation matrix of a data set which contains 455 data points, each data point containing 14 characteristics. So the dimension of the correlation matrix is 14 x 14.
I was ...
2
votes
0answers
131 views
How to compare results from two groups?
I'm getting confused with the analysis of one of my experiments. Here is how the results look like.
There were P participants in the experiments and they were split into two groups P1 and P2. Every ...
0
votes
2answers
929 views
Analysing questionnaire data
I want to test if there is a rivalry among two siblings in a family. I have 15 questions in my study and I let my 100 respondents ( distributed equally to two siblings) ranked them 1 to 15.
How ...
1
vote
1answer
145 views
Removing macro-level time variance
The title might be a bit misleading. Unfortunately statistics is not my area of forte, so gentle guidance along the right path is much appreciated. That said, here's my problem:
I'm working on ...
3
votes
1answer
188 views
Do the null hypotheses used for benjamini-hochberg have to be identical?
There are some cases where I would like to correct for multiple comparisons where the null hypotheses vary.
For example, if I am performing a chi-squared test or a fisher's exact test on multiple ...
5
votes
1answer
199 views
How can I control the false positives rate?
I feel I'm pretty new to this, since some time passed since my last statistics assignment, so please bear with me.
I am analyzing results of a biological experiment. Basically, I'm looking at a some ...
14
votes
4answers
3k views
Correcting p values for multiple tests where tests are correlated (genetics)
I have p values from a lot of tests and would like to know whether there is actually something significant after correcting for multiple testing. The complication: my tests are not independent. The ...
4
votes
2answers
2k views
