All Questions
7 questions
1
vote
1
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136
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Linear regression assumptions violated
I have an independent variable hours/day sitting and a dependent variable test scores, I think all of the assumptions of linear regression are violated, as in the pictures that I added
So I did one ...
- 57
0
votes
1
answer
810
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Levene's Test on SPSS doesn't show $p$-value [closed]
I have a factorial design with three factors. The model looks like this
$$y_{ijk} = \mu + \alpha_i + \beta_j + \gamma_k + (\alpha \beta)_{ij} + (\beta \gamma)_{jk} + \epsilon_{ijk}$$
where $i \in \{ 1,...
- 123
2
votes
1
answer
149
views
Checking for model assumptions on a $5 \times 3 \times 5$ factorial design
Let's say I have $5$ stains of a bacteria, and I want to test the number of bacterias on each stain to different temperatures ($27, 35$ and $43$ degrees), and different concentrations of a product ...
- 123
1
vote
0
answers
166
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Is sphericity violated if my sample size is less than the repeated measurement count?
In SPSS, I find that the Mauchley's test does not provide any result if the sample size is less than the repeated measurement count.
I have a sample size of 19 and a repeated measures of 22. My ...
- 31
2
votes
2
answers
4k
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Unequal sample sizes one-way ANOVA [duplicate]
I have a question about a data analysis that I am running. I am analyzing the results of a survey in which (expectedly) there exists far fewer people in one group than in another. This survey is an ...
9
votes
2
answers
13k
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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 ...
- 447
10
votes
2
answers
22k
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Understanding repeated measure ANOVA assumptions for correct interpretation of SPSS output
I am investigating whether different reward conditions may affect task performance. I have data from a small study with two groups, each with n=20. I collected data on a task that involved performance ...
- 791