# Tagged Questions

ANOVA stands for ANalysis Of VAriance, a statistical model and set of procedures for comparing multiple group means. The independent variables in an ANOVA model are categorical, but an ANOVA table can be used to test continuous variables as well.

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### Should I remove the outlier?

I want to run an ANOVA test. I am therefore testing for normality. I have tested each group and the residuals (group together)for normality. My data sample does not look approximately normal. However ...
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### 1-way vs. 2-way Anova (or non-parametric tests)

I am new to statistics and ecology and am doing this data analysis for bird count data. We have 3 treatments (which is 1 factor with 3 levels) and 2 sites (which are considered replicates as per ...
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### How to do a within subjects ANOVA when comparing the same thing but with different units?

So I am trying to compare a group's performance on a test over the course of three measurements. The grading scale for the test is from 1 to 100 points in the first two measurements, and for the ...
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### Moderation analysis for repeated measures ANOVA [on hold]

My dataset looks like this: My hypothesis is that the statistical differences between the within-subjects measures (A1 vs A2 vs A3) are moderated by a third variable (mod) which is continuous. What ...
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### What is the difference between these mixed ANOVA specifications

I am trying to perform a mixed ANOVA analysis with one between subject and two within subject factors. Some Experiment information Two groups of 17 subjects (old and young participant group) Three ...
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### Interaction Contrasts in SPSS

I am trying to run a 2x2 MANOVA with two sets of categorical independent variables (V1: healthy weight vs. overweight) (V2: binge eating diagnosis vs. healthy controls), on continuous dependent ...
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### ANOVA planned (a priori) tests

Can anybody tell me which ANOVA planned (a priori) tests exist? Which are their characteristics? How and when are they used? As I´m beginner in this area it would be also useful in someone could ...
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### Do I need to use a repeated measures statistical test for my data?

I conducted an analysis over three different time periods, investigating if there is a difference across time periods to how strongly my subjects react to two different stimuli. What I'm interested in ...
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### Should I use t-test or ANOVA+post hoc (two different treatments and a control)

I have been working with ice algaes,and Im looking on their fattyacids. Here is a bit about the experimental design. I have one treatment area, cleared, where I have removed all snow. I have ...
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### Can I report simple main effects without an interaction effect?

I have a quick question about reporting simple main effects. I am running a two-way mixed ANOVA and the interaction effect was not significant. I understand that if you have no significant interaction ...
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### Post hoc non-parametric tests

I am analyzing some data that has violated assumptions of ANOVA and am using the WRS2 package in R. I am concerned about the post hoc tests. I am comparing three groups, Dx, (schizophrenia, ...
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### ANOVA with standard deviation as the dependant variable

I have some experimental data collected from 5 separate treatments. Each group comprises a set of independent time series measuring the property I am interested in. The sample sizing (i.e. number of ...
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### Test signifance of each slope (corresponding to each level of a factor) in ANCOVA in R

Using Ancova, we can test the homogeneity of slope (or intercept) across different level of the a factor. Is there a way to test whether the individual slope is significantly different from zero using ...
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### Determining the correct test for experiment design

I'm trying to figure out the right test to use for my experimental design, I was hoping someone here could help. Here's the structure: Two independent variables, IV1 and IV2. IV1 has 3 levels, IV2 ...
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### Comparison: Exponential Regression vs Quadratic Polynomial Regression

See this file here: Decay.TXT. I first tried to fit the logarithmic model first ...
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### Interpretation of p-value for F-change

I'm having troubles with interpreting the following results. If I'm not mistaken, Sig. in the ANOVA table means that the R Square is significant. That is good news. ...
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### Comparing two models through ANOVA with different types of functions

See this file here: Decay.TXT. I first tried to fit the logarithmic model first ...
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### Appropriate data transformation

I have two dependent variables y1 and y2 with highly skewed distributions. In order to do ANOVA, I was trying to transform the ...
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### How to analyse this hierarchical-like data better?

I have a dataset whose structure is as below. Here f1, f2, f3 etc are a set of features. There are differennt models to predict each Vi from all fjs. There are different models to predict each Wi ...
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### Non parametric (or parametric) two way ANOVA in case of heteroscedasticity [duplicate]

I've got the following data set: 2 independent variables (age, with 4 levels, formulation, with 2 levels) and 1 dependent variable (consistency of cheese slices). I've tested the ANOVA assumption of ...
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### Testing for significant differences between mutiple groups (some not normally distributed)

I have been trying to process data I collected in R, but not getting anywhere, so I hope someone can help me out. My question could be interesting for anyone who wants to compare more than 2 groups ...
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### How to ascribe and defend statistical significance in linear regression. P-value interpretation and alternatives

I am studying a treatment that degrades device quality and performed an independent sample test on two batches that had different initial quality. I analyzed the data with a two variable linear ...
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### How can you test if a series of observations is significantly increasing?

For each subject, I have a series of numbers (d-prime) that increase depending on SOA. I'd like to show that these values are increasing up to some certain SOA. What would be the best test? I did a ...
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### Using an LMM for whole set of data vs using ANOVA for subsets

I did an experiment where I presented animals with 2 different stimuli over 3 different time periods. I'm interested to see if they show a statistically significant difference in response to the two ...