# Tagged Questions

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### How do you “control” for a factor/variable?

To my understanding, "Control" can have two meanings in statistics. Control group: In an experiment, no treatment is given to the member of the control group. Ex: Placebo vs Drug: You give drugs to ...
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### What is the most appropriate test for a multi-year different group/yr experiment?

I've been working on a research project for close to five years now. For my thesis I have to show how "well" did my approach improve things. Setup: Every year we use a tool A to brainstorm and ...
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### Question about correct ANOVA design

We have carried out an experiment that measures how many references it takes within a group to find the most expert person in that group on a specific topic (DV). We have 7 topics (4 of which are ...
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### What is the difference between “Unweighted”, “Weighted” and “Least Squares” Means?

These concepts have always confused me. In terms of DOE, I think the problem arises when the design is "unbalanced". So, what are their differences? Why do you choose one over the other/reasons? ...
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### What is the difference between “factors” and “covariate” in terms of ANOVA? [duplicate]

I am a bit confused on the term "covariate". It seems like the term can mean two different things. In ANCOVA, the term is used for the third variable that is not directly related to the experiment. ...
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### 3 way or 2 way anova?

I have the following dataset: ...
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### Split-plot ANOVA

I've carried out an intervention with three groups (control, low practice, and high practice) across two time periods (baseline and post-intervention). I used a split-plot ANOVA to analyse results and ...
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### Mixed factorial ANOVA interaction effect

I have carried out a 2 (pre-intervention, post-intervention) X 3 (control, low intensity intervention, high intensity intervention) mixed factorial ANOVA. The groups do not differ significantly at ...
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### The method of analyzing the data in a CRD

An experiment was performed to investigate the effectiveness of five insulating materials. Four samples for each material were tested at an elevated voltage level to accelerate the time to failure. ...
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### Individuals standard deviations and/or standard errors for groups after implementing ANOVA?

I've seen couple of articles reporting individuals standard deviations and/or standard errors for groups even after implementing ANOVA. My understanding is that groups SE's should be based on ...
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### What is the proper ratio of mean squares for a two-level nested ANOVA?

I would like to analyse the following type of experiment using a two-level fully nested ANOVA. We have mice of two genotypes (Group factor) and for each of the genotypes we take a certain number of ...