All Questions
Tagged with nonparametric statistical-significance
12
questions
6
votes
2
answers
4k
views
How to interpret Mann-Whitney's statistical significance if median is equal?
Testing the difference between the observations of two groups by using Mann-Whitney Test has given the following output (from minitab):
...
3
votes
1
answer
1k
views
How can I measure difference between non-parametric data with many zeros?
I'm comparing two groups of students by their course activity and I'm struggling a little to determine the best way to test for significant difference.
The data is non-normal, and very prevalent with ...
- 41
2
votes
1
answer
727
views
Appropriateness of nonparametric bootstrap methods to assess difference between two groups [closed]
This question is motivated by the discussion of this earlier question.
I have two samples $X$ and $Y$, where both samples have $n$ elements. Both samples represent optimal solutions returned from two ...
32
votes
3
answers
5k
views
Why does the Kolmogorov-Smirnov test work?
In reading about the 2-sample KS test, I understand exactly what it is doing but I don't understand why it works.
In other words, I can follow all the steps to compute the empirical distribution ...
- 915
16
votes
1
answer
2k
views
When/where to use functional data analysis?
I am very new to functional data analysis (FDA). I am reading:
Ramsay, James O., and Silverman, Bernard W. (2006), Functional Data
Analysis, 2nd ed., Springer, New York.
However, I am still not ...
- 2,957
10
votes
2
answers
2k
views
Confused about the Mann-Whitney $U$ test. Does it test distribution equality (pdf) or just mean/median equality?
I am rather confused about the Mann Whitney test, many statements I read state it tests for distribution equality between two populations and some state it tests for means/median/central tendency only....
- 215
8
votes
1
answer
5k
views
Differences between poisson.test and E-test when testing Poisson parameters
Suppose we have two independent Poisson-distributed variables $X_1$ and $X_2$. We want to test whether the Poisson parameters are equal, i.e. whether $\lambda_1=\lambda_2$.
Now we have 4 distinct ...
- 2,200
6
votes
2
answers
942
views
Subsets not significantly different but superset is
I have various clinical data on participants in a study. I'm looking at a continuous variable ("A") and a (binary) categorical variable (group) ("O"). I used a Wilcoxon test in R (the data are not ...
- 1,261
5
votes
2
answers
553
views
What test is appropriate for comparing the difference in accuracy between recognition tools?
I have developed a tool that recognizes a set of six classes, and then tested and evaluated its ability to recognize these classes by using the F-score (aka F-measure). I then tested two other tools ...
3
votes
0
answers
542
views
p-values for permutation tests
Let's say I want to test whether the average performance of two individuals who work together (let's say in the same room) is different to their performance when they would not have worked together.
...
- 107
2
votes
0
answers
118
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Test which method is better if data is gathered on overlapping time windows (not independent) [closed]
I have two methods which are being used to estimate a specific signal. I have a ground truth measurement of this signal and these two methods are using noisy data to estimate this signal. This signal ...
- 31
1
vote
2
answers
2k
views
What are the differences between parametric and non-parametric statistical tests?
I have seen that there are parametric and non-parametric statistical tests. What are the differences between them?
- 13.1k