# Tagged Questions

ANOVA stands for ANalysis Of VAriance, a statistical model and set of procedures for comparing the means of groups of related data. Generally the independent variables in an ANOVA analysis are categorical, not continuous.

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### How to estimate variance components with lmer for models with random effects and compare them with lme results

I performed an experiment where I raised different families coming from two different source populations, where each family was split up into a different treatments. After the experiment I measured ...
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### Phylogenetic dependent variables: ANOVA?

I understand deriving a covariance matrix from phylogenetic data to make $cov(X,Y) = 0$ for two variables you're making a regression on. But what happens if you have one continuous variable, that ...
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### How to analyse repeated measure ANOVA with three or more conditions presented in randomised order?

Context: My question concerns a typical design in my area – a researcher takes a group of subjects (say 10) and then applies three different conditions to them to measure the change in a response ...
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### Estimating comparative success of different brochures

The Real World Problem One of my clients is preparing to send a direct mailer to their subscribed user list, and this statistical challenge came up. Their marketing team has 3 different brochures, ...
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### What does the anova() command do with a lmer model object?

Hopefully this is a question that someone here can answer for me on the nature of decomposing sums of squares from a mixed-effects model fit with lmer (from the ...
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### How to compute confidence interval in ANOVA with repeated measures?

I made a model using repeated measures univariate ANOVA in R. ...
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### Statistical test to compare different treatments over time

In my experiment I have 4 treatments (the control plus the variables: A, B, C) and I am comparing the growth among them. I have 4 replicates for each treatment. Thus 16 samples in total. Every other ...
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### Assumptions of two-way ANOVA and k-fold cross validation

I want to compare 3 classifiers (kNN, SVM and CT) by using their classification accuracies on 10 folds, to highlight eventual differences between them. I think it could be done by a two-way ANOVA ...
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### Which repeated measure statistical test must I use in this case?

I have a set of general conditions A, B, C, D, E and F to solve a problem. Each of these conditions lead me to different number of experiments according to a parameter that i change in each general ...
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### Which test to use to compare vitamin D levels

I'm working on research into the vitamin D levels of professional and amateur soccer players, and relationship with factors such as skin color, vitamin D-intake etc. I don't know which test to use. ...
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### Repeated measures ANOVA in R for non-orthogonal design

I have data from a two-factor within-subjects experiment design where the conditions are not orthogonal. Factor one (Location) has three levels; factor two (Stimulus) has three levels, one of which is ...
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### 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 ...
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### Can I trust the result of a one-way ANOVA with many treatments each with very few replicates

I am doing a one-way ANOVA of a response variable (Y) on a treatment factor (T) of 7 levels. However, for each treatment, I have only 2 observations (or replicates). The ANOVA result shows the the ...
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### ANOVA variable that is both BETWEEN & WITHIN

Does anyone know how / if can you treat an independent variable as BOTH a between AND within subjects variable (ideally in SPSS ANOVA-repeated measures). That is, we have a repeated measures study ...