Tagged Questions

0
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0answers
26 views

2 x 3 Intervention Study Design

I have an intervention that I want to test and I am a little bit "statistically challenged." There will be two groups (treatment and control) over three periods of time (pre-test, post-test, and a ...
2
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2answers
146 views

Which are the correct sum of squares for repeated measures ? (balanced example)

Below are three ways to fit a MANOVA model in R and to extract ANOVA tables from the fitted model. The design is balanced. All methods give different results. The data are 5 groups of 4 individuals ...
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0answers
214 views

G*Power-Repeated measures MANOVA “number of measurements” input field

I am trying to calculate the sample size needed with G*Power for my dissertation study. I will be doing a Repeated Measures MANOVA within/between interaction. My question is in the field "number of ...
2
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0answers
61 views

How can I test for significance of a treatment in an unbalanced, repeated-measures experiment using R?

CrossValidated Community, I must mention that I am a first-time poster (and relatively new to both modelling and R), so please excuse any norms I may violate in my post and politely inform me. I ...
2
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1answer
159 views

Repeated measures ANOVAs instead of repeated measures MANOVA w/ small N?

I have 3 variables that have been measured on 4 occasions and a sample size of 16. I was considering a repeated measures MANOVA to ascertain if the changes over time were statistically significant. ...
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0answers
196 views

What is the “Main effect” in General linear model with repeated measures

For my bachelor thesis I used an General linear model in SPSS with repeated measures. The data is from a research project on emergent literacy I did with an eye-tracker. The 3 within subject factors ...
2
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0answers
34 views

How to compare first to second half of measurements in a counterbalanced behavioral experiment?

I want to compare measurements in two halves of a behavioral experiment to examine for learning effects. My first course of action is to split the measurements in the two halves and then repeat the ...
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0answers
46 views

Creating new variables to measure main effects and interaction with MANOVA

I have a repeated measures design (all subjects were in all conditions) with 4 conditions and a dv that can take 4 values (0 - 3). It was suggested to me to analyze this as a MANOVA and define the dv ...
1
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1answer
2k views

How to examine differences between two groups across three different experimental conditions?

I have data for two groups. The 2 groups are matched on a number of variables, but differ in the scores on an alcohol measure (one group is high, and one is low). However the groups have been created ...
13
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2answers
4k views

Differences between MANOVA and Repeated Measures ANOVA?

What is the difference between a repeated measures ANOVA over some factor (say experimental condition) and a MANOVA? In particular one website I stumbled across suggested that MANOVA does not make ...
3
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1answer
473 views

Is MANOVA the correct way to handle multiple response variables that are additive?

Context: I am trying to analyze an experiment on plant community response to two treatments. Here’s a simplified description of the experiment, there are a few extra complications in reality. ...
2
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2answers
493 views

Repeated measures with correlated measures (not time)

Most repeated measures ANOVAs have time as the repeated measure; I was wondering about using a repeated measure that is not time. Say we fed two groups of animals different diets. At the end of the ...
3
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2answers
1k views

Consequence of violating independence assumption of ANOVA

I would like some help with the following problem. I have 40 subjects. On each subject I take a measurement at 25 body sites. The measurement is a continuous variable that varies between 0 and 1 and ...