Questions tagged [two-way]
For statistical models or methods used to study the effects ow two variables simultaneously, see https://en.wikipedia.org/wiki/Two-way_analysis_of_variance
134 questions
2
votes
1
answer
212
views
Custom contrasts involving interaction terms using emmeans
I'm trying to setup a custom contrast using emmeans but am a bit unsure on how to do so properly.
I have two factors, let's call them A and B, with three levels each.
I want to test the following ...
- 23
5
votes
2
answers
282
views
Closed form for two-way ANOVA
Consider $Y_{ij} = \alpha_i + \beta_j + \varepsilon_{ij}$, where $\sum_i \alpha_i = 0$ for identifiability and $\varepsilon_{ij}$ is noise. The data is not balanced. What is the closed form for the ...
2
votes
1
answer
69
views
Why the relative absence (sample-wise) of a correlation doesn't imply the absence of a significant interaction effect (sample-wise)?
Social psychologist here.
I find interesting the abovementioned question, because it goes down to the meaning of the interaction effect, in my opinion.
Moreover, in a seminar once a professor told me ...
- 582
1
vote
0
answers
95
views
Which statistical test? - Does repeated two-way ANOVA work?
I'm not sure which statistical test to use on my data?
I am trying to find:
Day of the Week → Does temp significantly change across different days? 2. Location → Is temp significantly different ...
- 71
1
vote
1
answer
198
views
TWO WAY ANOVA - Parameter Estimates Interpretation
Parameter estimates table produced in TWO WAY ANOVA:
When I'm interpreting my parameter estimates table I've been led to believe that the intercept is the overall grand mean of the data? Is this ...
- 71
1
vote
1
answer
135
views
Gaining additional information after Kruskal-Wallis by further comparing groups using Wilcoxon? (when two-way ANOVA is not possible)
I have the following experimental set-up, with the numbers being individuals in six groups:
Scenario
Treatment 1
Treatment 2
Treatment 3
A
28
27
27
B
28
28
28
What has been measured once is distance ...
- 11
0
votes
1
answer
114
views
Approaches to multiple pairwise comparisons following non-parametric 2-way ANOVA
We have a dataset with 3 treatments and 5 groups, with different $N$ for different combinations, with data that is not normally distributed.
We see significant effects using a Skillings–Mack Test ...
- 11
3
votes
3
answers
760
views
Two way ANOVA or two way repeat measurement ANOVA
I would like to compare two age group of people over two time point. Say, the temperature of children versus adult at 1st month and post 6-months respectively.
Dependent v: Temperature
Independent V: ...
- 69
1
vote
0
answers
65
views
Help needed in recreating ANOVA test results from study
I am aiming to recreate ANOVA tests as part of Study 1 from the following research paper related to some psychological factors:
https://doi.org/10.3389/fpsyg.2021.738447
There are altogether 80 ...
- 11
0
votes
0
answers
79
views
Should I use one-way or two-way anova?
There are eight groups of treatment with different concentrations and different. Initially, we thought about using two-way ANOVA with the factors being 1. the type of experimental setup and 2. the ...
- 11
0
votes
1
answer
101
views
Two-way ANOVA help
I am measuring the differences in fungal abundance in different stages of grazing and depth so I have tow factors (grazing intensity and soil depth) My main effects are all significant but so is the ...
- 1
0
votes
0
answers
84
views
Appropriate design for two experimental conditions and incomplete blocking
I'm planning to perform an experiment in which I will be assessing the role of two experimental variables (A: 6 levels, B: 4 levels) on a defined outcome which, however, might be affected by external ...
- 21
2
votes
1
answer
137
views
Anova model assumptions. How to go by?
I have a data frame that contains a continuous response variable measured on different species, at different elevation and month of sampling as explanatory variables. I want to analyze how the ...
- 73
2
votes
1
answer
615
views
Confusion about Two Way ANOVA test vs Chi-square test for independence. Which one to use here?
A certain drug is claimed to be effective in curing cold. In an experiment on 500 persons suffering from cold, half of them were given the drug and the other half were given the sugar pills. Patients' ...
- 31
1
vote
0
answers
78
views
How to analyze multivariate data that comes from a 2D design space?
I'm analyzing a set of biological samples. Each sample is linked to a specific carbon and nitrogen concentration, representing the 2D (experimental) design space I referenced in the title. I've ...
