All Questions
Tagged with nonparametric t-test
22
questions with no upvoted or accepted answers
3
votes
0
answers
113
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When can I use a permutation test to see if means of two distributions differ without Type I errors?
I am analyzing psych experiments which generally take the form of a list of outcome measures for the test and control groups, with roughly equal sample sizes, and I would like to compare their means ...
- 193
2
votes
0
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455
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Effectiveness of exam: did it achieve the goal?
I have a dataset of student scores in an exam. Its structure is as follows:
...
- 121
2
votes
1
answer
100
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dependent T-test or Wilcoxons signed rank for small sample size?
I am doing an EEG study with a small sample size (N=13) and I have many variables that I need to compare (for example, onset of readiness potential, maximal point of RP, time or awareness, etc), so i ...
- 21
1
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0
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44
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Which Non-Parametric Test should I use?
I want to make sure I am choosing the right statistical test.
I am working with 7 semesters of exams scores for a particular course.
Each semester the course ran with many sections. However, the ...
- 11
1
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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
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0
answers
670
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Mann-Whitney U Test and Independent t-test give different results, which to use?
I have two population and I want to know if the means of the two populations are different. To the best of my knowledge, I should try an Independent t-test if the data is normality distributed and ...
- 65
1
vote
1
answer
81
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Is there any possible statistical test for this data?
I have a data set of the daily dosage of a drug that participants take against some signs and symptoms. The data are highly skewed to the left because there are a lot of patients with 0mg per day of ...
- 29
1
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0
answers
46
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Paired t-test on large sample that *should* be normal, but isn't (or Wilcoxon Signed Rank Test)?
A dataset contains the number of fast food restaurants per thousand people for each county in the USA, for two different years (five years apart). 3,143 rows.
None of the following are normally ...
user252085
1
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0
answers
132
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What test to use when the dependent variable is an integer but independent variable is categorical? (Data non-normal, unequal variances)
My independent variable is species (categorical).
My dependent variable is the total mass of what each species ate (in grams, numerical).
I want to test the difference in mass values between ...
- 145
1
vote
0
answers
36
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2 sample t test
I was thinking that a simple 2 sample t test is not that simple when dealing with skewed data.
Considere 2 samples, each one with diferent skewness and kurtosis, both with a big sample sizes (say n > ...
- 561
1
vote
0
answers
45
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Non parametric tests for relation/association between variable
What could be an appropriate test for checking whether there exist any relationship between Net Promoter Score ( Categorical in nature with 0 meaning detractor, 1 meaning Neutral, 2 meaning Promter ) ...
- 111
1
vote
0
answers
690
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Bayesian Wilcoxon test
I have a pre-post dataset with 2 observations per subject (propotion data -bounded between 0 and 1-).
I have analyzed the data with a classical dependent t-test under the NHST paradigm. However, as ...
- 157
1
vote
0
answers
312
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Non parametric anova or two non parametric ttest?
I have a statistical question about a project I recently got.
We performed a flow cytometry assay on 3 different groups: controls (n=5), patients before treatment (n=5) and paired patients after ...
- 501
0
votes
0
answers
87
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Which statistical Test should I use/ Comparing 2 groups
I am new to statistics, can someone guide me regarding the test I should use to compare the foot dimensions of 9 subjects to footwear dimensions (we have 2 footwear brands).
So, to simplify, I have ...
0
votes
0
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82
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Self-contradictory asumption of normality? Nonparametric point-biseral correltion coeffiicent? t-test or Mann-Whitney U?
A. I know from the net that for a design with one binary variable and a second variable that is continuous but is NOT normally distributed, I can use BOTH the point-biserial correlation (which is ...
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