# Tagged Questions

58 views

### What is a non parametric equivalent test for two-way anova that can include interactions

Hi I am trying to find the non-parametric equivalent of a two-way ANOVA (3x4 design) which is capable of including interactions. From my reading in Zar 1984 "Biostatistical analysis" this is possible ...
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### Violation of too many assumptions?

I'm trying to determine whether I should be using an ANOVA or a non-parametric test. My DV is rating of confidence on a Likert scale (1-5), and 4 categorical IVs (n = 496). Data distribution within ...
44 views

### ANOVA for heteroscedastic data

I have applied ANOVA on 3 independent groups of unequal sample sizes. I doubt that the ANOVA result are showing Type 1 error because of heteroscedasticity in data points (checked using F-test as well ...
89 views

### Non-parametric paired analysis of variance with unequal data

I have tried to search, but couldn't find an answer for my problem. I have data from different subjects that are exposed to different conditions. But they are exposed to the different conditions ...
56 views

### Which test for a two factor, unequal sample size, non-normally distributed data?

I have neural firing-rate data (continuous values with means ranging from 0 to 45 Hz) that depends on two categorical factors. Factor A has 2 levels et factor B has 4 levels. So I have a total of 8 ...
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### Nonparametric statistical test for analyzing 2*3 between-subject design's main & interaction effect

I am now having trouble analyzing my data since I got stuck on selecting the proper statistical test to use. My data is a 2$\times$3 between-subject design data. The two IVs are one norminal(with ...
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### Non-parametric test for comparing four treatments and three times

I am working with a dataset where I need to use non-parametric stats (won't go into details). It is behavioral data on captive animals ($n=8$), where $4$ treatments were introduced $3$ different times ...
764 views

### Two-way anova with interaction term: what is the point of a post-hoc test?

I have a statistics interpretation question. I've recently performed a two-way anova to identify an interaction term between my categorical independent variables (genotype + temperature) that ...
56 views

### Two uneven groups (101 vs 21) measured twice; what repeated measures ANOVA equivalent can help?

I have a question that I have difficulties in answering: I have two groups of patients tested twice at the same continuous variable. Group A=104 & GroupB=21. So two groups, one continuous ...
52 views

### Ranks test problem

This is a questions I got for homework in test planning and variance analysis. I apologize in advance for the way my professor phrases things :D I would love to hear hints or tips on how to approach ...
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### Non-parametric test for 3 matched-pairs?

I showed a video to 3 groups, and they answered questions before and after the test. Control group watched it with no ads Group A watched it with ad A Group B watched it with ad B The sample is such ...
175 views

### Non-parametric counterpart of Nested Anova with unbalanced designed

0 down vote favorite Is there a non-parametric counterpart of Nested ANOVA with unbalanced designed? My data is not normal even after doing different transformations. Thus i could not use parametric ...
375 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 ...
2k views

### Non-parametric alternative for 2-way ANOVA [duplicate]

Suppose I have 2 independent variables whereby normal distribution can be assumed. However, there is unequal variance and interaction between the two factors is unknown. Could someone suggest an ...
1k views

### Non-parametric for two-way ANOVA (3x3)

My dependent variable is continuous, non-normal (skewed left according to Shapiro-Wilk test). I have two independent variables (treatment group by colour, food type). There are 3 levels within each ...
1k views

### Nonparametric alternative to ANOVA for testing the difference between several brand preferences

I have collected a data from about 200 customers on their brand preference of 5 international fast food chain shops. Each customer was asked to rank all the 5 brands from highest to lowest (5 for the ...
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### What is the nonparametric variant of multivariate ANOVA with more than one one factor (and with interactions between factors)?

I analyze real data where assuptions of classical multiway (more than one factor assumed) MANOVA (more than one response variable) are not met (normality, equal variances). Is there any nonparametric ...
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### How can I test for within-subject “consistency” across repeated measures?

I have a dataset with a clear question I want to answer, but I'm unsure of the best statistical approach to answer my question. Here's an example that matches the structure of my data: Let's say we ...
340 views

### Friedman's Anova on qualitative data in SPSS

I have some qualitative data and having trouble preparing the data before I perform the analysis in SPSS. My understanding of Friedman's anova is that the data must be ranked from lowest to highest. ...
7k 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 ...
787 views

### General approach for non-parametric two-way ANOVA

Apologies for the almost text-book like question. I have a 2x2 design with fixed categories and a continuous response variable. If the variances are equal between groups (Bartlett test) and ...
166 views

### Can median polish be used for hypothesis testing?

I recently learned about the median polish method as a robust alternative to ANOVA for the purposes of fitting models to data. But, is there a way to test hypotheses using median polish, such as a ...
517 views

### Why would I use ANOVA instead of a Rank-Sum test?

A colleague of mine with little statistics experience is trying to perform an experimental evaluation of a computer program. He created a between subjects design and solicited test subjects. 11 ...
264 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 ...
3k views

### Is there an equivalent to Kruskal Wallis one-way test for a two-way model?

If the model does not satisfy ANOVA assumptions (normality in particular), if one-way, Kruskal-Wallis non-parametric test is recommended. But, what if you have multiple factors?
3k views

### Pairwise comparisons after significant interaction results: parametric or non?

I've run a 2-way ANOVA on growth rate data (grams/day) with the factors of year type (good and poor) and site (A and B). Though the data themselves are non-normal and do not have homogeneous ...
2k views

### Friedman's test and post-hoc analysis

I am carrying out a statistical analysis for my research. I am using a Friedman's test with post hoc analysis. At present I am using the function ...
721 views

### Two-way robust ANOVA

My struggle with non-parametric methods continues... I'd like to apply a median polish instead of two-way ANOVA (normality and homoscedascity assumptions are violated, and $n_{ij}$ are small, so I ...
3k views

### Which non-parametric test can I use to identify significant interactions of independent variables?

I have an experiment producing results (dependent variables) that don't pass tests of normality, thus I am testing hypotheses using non-parametric tests. My DVs are continuous, while my factors ...
2k views

### Multi-way nonparametric anova

I have to analyze a factorial design with five factors (one of them nested in another one) and numeric responses. I would like to perform a nonparametric ANOVA, but of course I can't use neither ...