584 normality-assumption questions.

Paired t-test of a non-normal data with sample size 66

I have a paired data with n=66. I understand that normality condition of differences data should be met to conduct a paired t-test. However, from the histogram, it doesn't appear so normal. The p-...

Can I report both Spearman and One way ANOVA tests for the same variables?

I have one continuous variable (number of actions on a platform) and a ranked variable (education: values from 0 to 3). My research question is "Do people with more education perform more actions on ...

1 A powerful test for any distribution

Simulations by Razali et al (2011) showed that the Shapiro-Wilk test of normality provided the most power (at a fixed significance level) when compared to Anderson-Darling, Kolmogorov-Smirnov, etc. My ...

2 Point Biserial Correlation

In terms of testing the assumption of normality for a Point Biserial Correlation; I have a dichotomous variable (1 = microsleep, 0 = no microsleep) and a continuous variable (number of driving events ...

Independent variable distribution in GLMM

0 answers, 11 views normality-assumption glmm
Must the input / independent variables in a generalized linear mixed model (GLMM) be normally distributed?

Do I need to check for normality in a one-way test (in R)?

http://www.sthda.com/english/wiki/one-way-anova-test-in-r Here it says when the LeveneTest has small p-value we can use the alternative one ...

1 Normality test and parametric vs non parametric tests

I'm pretty new in statistical testing and I'd like some help in what I'm doing. I have two groups of scores from 0-100. Group A has 10 values and group B has 70 values. Initially I'm testing normality ...

15 Repeated measures ANOVA: what is the normality assumption?

I am confused about the normality assumption in repeated measures ANOVA. Specifically, I am wondering what kind of normality exactly should be satisfied. In reading the literature and the answers on ...

23 What should I check for normality: raw data or residuals?

3 answers, 34.634 views normality-assumption residuals assumptions

1 OLS and Probit possible on large sample enough?

I think I understood that normality of residuals may not be a problem if the sample is large enough (cf, here). My question is: Would my sample be large enough to be analysed using a probit and an ...

3 Possible statistical tests to separate two distributions within a dataset

I have a dataset that contains a range of values. I have created a frequency distribution of the values, and have included the plot below. To my untrained eye, it appears that the frequency ...