All Questions
Tagged with nonparametric r
235
questions
1
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1
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2k
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P-value correction for multiple comparisons using Mann-Whitney test (using R)
I have one question regarding the adjusted p-value for multiple comparison using Mann-Whitney test.
The data structure that I am dealing with is something like this:
Two groups to compare: Group 1 vs ...
- 335
1
vote
0
answers
134
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Tests for positively skewed data with large enough samples?
I'm new to statistic tests so I need a little bit of help with them. Most of my data has distribution similar to the histogram below.
As it can be seen from the histogram, the data is positively ...
1
vote
0
answers
148
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Effect size using nparLD library RStudio
I would like to calculate the size of the effects using RStudio for writing an article.
I have longitudinal data taken in 4 time points: baseline, day 20, day 50 and recovery (one month after) in a ...
- 21
3
votes
1
answer
214
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Random forest with nonnegative dependent variable
I have a modeling framework with an outcome that must necessarily be positive. In the training data, the outcome ranges from close to zero to much higher (approximately 0.05 to 100). Is there a way to ...
- 725
1
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0
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96
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Time Varying Coefficient Model with Uniform Kernel and Spline Estimator
I'm working on the BMACS data set data(BMACS) from library(npmlda).
I'm looking at the the time-varying coefficient model of post-CD4 versus smoking $X_1$, pre-HIV CD4 percent $X_2$ (centered) and age ...
- 25
1
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0
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78
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Nonparametric confidence interval for the mean: Failure to reproduce formula from Zhou & Dinh (2005)
Zhou & Dinh (2005) propose the following formula for a $(1 - \alpha)100\%$ confidence interval for the mean of one sample. The confidence interval is based on a transformation of the
$t$-statistic:...
- 31k
3
votes
0
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608
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What does it mean when F values of ANOVAs are not all ~0?
I am running an aligned rank transform ANOVA (a non-parametric ANOVA for an ordinal DV). In my data there are 3 factors and one ordinal DV.
When I create the model:
...
- 319
0
votes
1
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969
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PMCMRplus post-hoc Nemenyi's all pairs test ignores alternative?
After a successful Friedman test, I would like to perform post-hoc analysis using the all pairs comparisons Nemenyi's test. Specifically, as I am interested in finding out if the values of some of my ...
1
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0
answers
1k
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Multi-Factor Kruskal Wallis Test in R
I have a dataset where the response variable is a non-normally distributed proportion and is heterogenous with respect to all factors. I cannot seem to transform the response variable into anything ...
0
votes
0
answers
94
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How to calculate significance between more than two levels of a mean cumulative function estimate in R's REDA package?
Concerning the R's REDA package:
HTML Tutorial: https://cran.r-project.org/web/packages/reda/vignettes/reda-intro.html
CRAN's package API documentation: https://cran.r-project.org/web/packages/reda/...
- 605
3
votes
1
answer
88
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Does it make sense to run Wilcoxon rank sum test with sample size of 1 or 2?
suppose I have the following numbers.
...
- 331
1
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2
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451
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4
votes
1
answer
106
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Nonparemetric tests: how to support the null hypothesis you claim to be testing
Let us assume that we have taken an unbalanced number of independent random samples from 5 different populations, which will be analogous to 5 different locations in this example. Each observation ...
- 351
2
votes
1
answer
198
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Clarification of methods for using non-parametric tests to compare groups- vegan package
I would like to validate my approach to comparing groups using non-parametric tests. data created below describes the structure of my data. Each ...
- 351
0
votes
0
answers
38
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Which test to use? Independent data or not?
What I have is a cross section of a bone divided in 60 equal slices. These 60 slices form 4 groups of 15 slices each corresponding to the 4 anatomical orientations (anterior, lateral, posterior and ...
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