All Questions
9
questions
5
votes
2
answers
294
views
How to compare more than two groups of continuous, not-normally distributed values?
I'm currently analyzing the age variable in a dataset of all italian phyisicians (~470,000 obs) and I'm trying to check if age is significantly different between three groups defined by another ...
- 151
1
vote
0
answers
46
views
State-of-the-art nonparametric $k$-way ANOVA allowing heteroscedasticity
QUESTION: Can you recommend a nonparametric version of a multiway ANOVA that is also robust in the absence of homogeneity of variances? So, this is what I am looking for:
(1) Nonparametric ANOVA (no ...
- 789
6
votes
1
answer
1k
views
Difference in means statistical test for non-normal, heteroscedastic data?
Suppose I have a data set with three or more groups. After some exploratory data analysis, I find that
The groups do not come from a normal distribution
the variances within the groups are not equal,...
1
vote
0
answers
381
views
Non-parametric Levene's test by Nordstokke and Zumbo
The example they mention is using a one-way ANOVA. What if I have two factors (3x11) and a dependent variable, can I do a two-way ANOVA to calculate the univariate levene's test? If so, how would I ...
- 11
2
votes
1
answer
321
views
How to deal with non-normal heterocedastic data from a factorial experiment?
I ran an experiment with two factors each with two levels, 5 replicates each combination and one response variable. My data are non-normal and heterocedastic. Transformations didn't help. I ran a ...
- 21
2
votes
1
answer
4k
views
Alternative to 2-way ANOVA when variances are unequal
I'm working on a question on 2-way ANOVA where there are 2 treatments and 1 blocking factor. The residual plots suggest unequal variance. What is another parametric or non-parametric alternative ...
- 101
19
votes
2
answers
40k
views
How to run two-way ANOVA on data with neither normality nor equality of variance in R?
I am working on my master thesis at the moment and planned on running the statistics with SigmaPlot. However, after spending some time with my data I came to the conclusion that SigmaPlot might not be ...
- 191
4
votes
2
answers
464
views
ANOVA for non-normal heterogenous unequally replicated data
I need some advice on how to proceed with my data analysis. I have 3 groups (Archaea, Bacteria and Eukarya). Each group has unequal number of individual species (70, 651, and 244 respectively). Each ...
- 41
18
votes
5
answers
5k
views
Checking ANOVA assumptions
A few months ago I posted a question about homoscedasticity tests in R on SO, and Ian Fellows answered that (I'll paraphrase his answer very loosely):
Homoscedasticity tests are not a good tool ...
- 2,211