# Tagged Questions

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### How to check the assumption of equal error variance might be violated?

I want use this box plot to check it. Thank you
31 views

### Inspecting assumption of homoscedasticity

Using a Fligner test to infer about the respect of the assumption of homoscedasticity is not very smart given that the Fligner test tests to the null that there is no difference of variance between ...
25 views

### Fligner.test with R

Why does this: fligner.test(a ~ b + c + d, data=df) and this fligner.test(a ~ b + d, data=df) always equal for whatever ...
40 views

### Anova. Homoscedasticity not respected

I'd like to perform an ANOVA with a normally distributed response variables and several explanatory variables. Some of the explanatory variables are continuous and some are categorical (factor(..)). ...
39 views

### 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 ...
127 views

### What is model adequacy checking in ANOVA?

Does model adequacy checking mean "Checking the normality assumption that $\epsilon_{ij}\sim \mathcal{N}(0,\sigma^2)$"? More specifically, does it mean checking that the residuals, ...
81 views

### A priori comparisons in a repeated measures design

I'm interested in finding out more about the use of a priori planned contrasts within a one-way repeated measures ANOVA design. Predictions: Grps 2+3 < Grp 1 Grp 2 < Grp 3 My questions ...
39 views

### Importance of estimating $\sigma^2$ in linear Statistical model

Statistical model for Complete Randomized design $y_{ij} = \mu + \tau_i + \epsilon_{ij}$ where, $i$ denotes treatment and $j$ denotes observation. $i=1,2,...,k\quad and \quad j=1,2,..., n_i$ ...
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### Importance of the normality assumption in linear statistical models

Statistical model for Complete Randomized design $y_{ij} = \mu + \tau_i + \epsilon_{ij}$ where, $i$ denotes treatment and $j$ denotes observation. $i=1,2,...,k\quad and \quad j=1,2,..., n_i$ ...
290 views

### Can I justify performing a two-way anova where data is normally distributed but has heterogeneous variances?

I'm an undergraduate psychology student currently finishing up my dissertation, but a few days ago, while going through my SPSS output, I realized my Levene's test is significant, but my data is ...
239 views

### On what basis do we differentiate a standard normal distribution from normal distribution?

The normal distribution is a prerequisite for ANOVA. It is not clear what we are supposed to understand by "standard normal distribution". Does ANOVA need a standard normal distribution? The answer ...
142 views

### 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 ...
3k views

### How to test for normality in a 2x2 ANOVA?

Study Design: I showed participants some information about sea-level rise, focusing the information in different ways, both in terms of the time-scale and the magnitude of potential rise. Thus I had a ...
336 views

### ANOVA - independence assumption

I have conducted a study in which I have gathered 3 sentences per participant. These sentences were then classified and the words per sentence were counted. I want to test if there are significant ...