All Questions
7 questions with no upvoted or accepted answers
2
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Simulating data for repeated measures ANOVA
I am currently working on a simulation study in which I compare two methods for analysing data from a repeated measures design. Let's say there are n subjects, and each subject goes through i ...
- 741
1
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0
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357
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Variance-Covariance Matrix (Sphericity): Valid?
I am completing a basic statistics exercise for a graduate-level ANOVA course (for psychology trainees). We've just started on repeated measures (i.e. within-subjects) designs, beginning with the ...
- 31
1
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1
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134
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How does sphericity violations affect RM-ANOVA results?
My current understanding is that sphericity violations inflate the F-value and therefore type I error. I'd like to know how exactly this manifests itself mathematically.
To follow-up, why does ...
1
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0
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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 ...
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1
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0
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90
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Can I use RM-ANOVA with unbalanced within-subject design with sphericity violated?
I have data from an EEG experiment. Originally, the design was balanced, but because in EEG you loose a lot of data to noise and malfunctioning equipment, the end-result is unbalanced data.
I am ...
- 211
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Can I use both Greenhouse-Geisser AND Huynh-Feldt?
Basically I'm doing a repeated measures ANOVA with the following interactions:
Stimulation,
Emotion,
Time-Stimulation,
Time-Emotion,
Stimulation-Emotion,
and Time-Stimulation-Emotion
Mauchly's Test of ...
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0
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1
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123
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Is a correction for sphericity violation needed for post-hoc comparisons following repeated-measures ANOVA?
In a repeated-measures ANOVA, there is an assumption of sphericity, so that the variance of differences between groups is similar for all pairs of groups. A violation of this assumption can be ...
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