All Questions
Tagged with nonparametric normality-assumption
16
questions with no upvoted or accepted answers
3
votes
0
answers
76
views
Comparison of cell counts with a right censoring
I have cell counts related to the action of different microorganisms and I want to compare their distribution. It's supposed they follow a normal distribution after a log transformation, but I can't ...
- 75
2
votes
1
answer
70
views
Alternatives to ANOVA to find differences between three groups?
So my data is looking at the incidence of emotions within therapy sessions. I am looking at three groups that I suspect have different pattern across several emotions
Group 1 n=36
Group 2 n=12
Group 3 ...
- 21
2
votes
0
answers
57
views
group comparisons - normality of the distribution
When comparing 3 different groups on a certain variable and one of the groups does not have a normal distribution (as verified by the Shapiro test) whilst the other to do, would you think it is best ...
- 305
2
votes
0
answers
123
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Which statistical method of anlysis should I use?
I am conducting an experiment where I will measure the strength of a material used for roads. Ideally, I would like to use a large surface area to measure this but this takes too long and is really ...
- 1,135
1
vote
0
answers
15
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Looking for associations between nominal and non-parametric continuous data
I'm a first-year BSc Biology student working on my end-of-module stats project, so that's the expected level of my work.
I need to find associations between hindlimb length and frog locomotor modes (e....
- 11
1
vote
1
answer
241
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Which statistical test should I use if the assumptions of a 2-way ANOVA are not met?
My study design consists of two factors (one with 2 levels, the other with 6) and a continuous response variable. In order to analyze the influence of both factors on the explanatory variable I built ...
- 441
1
vote
0
answers
106
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Bounds for hypothesis testing with non-normal distributions
After doing randomized experiment with two variants (AB tests), I want to do hypothesis testing without the normal distribution assumption to compare their means. Since the samples sizes are different,...
1
vote
0
answers
144
views
Coverage of confidence interval of non-normal distribution
I know that when a sample is non-normally distributed, I need to use non-parametric alternatives, as when the assumptions of parametric methods are violated, its coverage will decrease.
Let's say ...
- 1,041
1
vote
0
answers
143
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Four standard deviation rules in relation to normality testing
Within our department we were given a set of guidelines for how we might decide whether to proceed with parametric or non-parametric testing (for continuous data). These were drawn up in consultation ...
- 11
0
votes
0
answers
31
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Anova violates normality assumption for error data
I have a 2 x 2 repeated measures ANOVA (N = 51) with Error Rate data as the dependent measure. The error data violates the normality assumption, even when outliers are removed. I have looked at the ...
- 113
0
votes
0
answers
67
views
Comparing non-normal data between three groups
I am analyzing a dataset, where I have 3 categories (independent variable), and one continuous value (dependent variable). I am studying if the continuous value is significantly different between the ...
- 21
0
votes
0
answers
275
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How can I perform a Tetrachoric and Polychoric Correlation on variables that aren't normally distributed?
From everything I have read, both tetrachoric and polychoric correlations assume normal distributions. However, the data I want to conduct these correlations with is not normally distributed. Does ...
- 101
0
votes
0
answers
175
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Is there a non-parametric test to replace repeated-measures ANOVA in R?
I have a data set with 41 individuals, male and female, and 3 different measurements of a variable for each individual. The data is not normally distributed, nor does it have equal variances between ...
0
votes
0
answers
50
views
Parametric v Non-Parametric?
I've recently began doing some data analysis for a sample of around 5800 respondents who are categorised into four different groups in relation to different levels of psychological connection in a ...
- 1
0
votes
1
answer
213
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Normality Tests in samples with outliers
I'm making a code in R that contains some parametric and non-parametric tests, like ANOVA and Kruskal-Wallis.
To know if I should use one or another I check the "normality" of the test sample. My ...
