Tagged Questions

0
votes
0answers
26 views

“effects not estimable” error in R aov

I have data on the effect of treatment on leg shaking. I reused several individuals so I want to know Is there a significant effect of treatment on shaking Do the reused individuals present some ...
0
votes
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 ...
0
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0answers
29 views

Which ANOVA method should I use?

I carried experiments of drying cotton seeds with three different mass flow rate of inlet air. For each mass flow rate air was supplied at three different inlet air temperatures. I have weight loss ...
1
vote
0answers
66 views

Test for 1 IV, 2 DVs, with multiple samples from each subject

I have a set of data with 1 independent variable (IV, categorical), and 2 dependent variables (DV, continuous). Multiple samples were obtained from each subject with variable sample size, and one of ...
1
vote
1answer
294 views

MANOVA vs. Repeated Measure ANOVA

Thanks for your time. I want to compare accuracy of several predicting models. I am comparing their MAE. each model use same all or some predictors. Which approach is better MANOVA or repeated measure ...
1
vote
0answers
107 views

What is the nonparametric variant of multivariate ANOVA with more than one one factor (and with interactions between factors)?

I analyze real data where assuptions of classical multiway (more than one factor assumed) MANOVA (more than one response variable) are not met (normality, equal variances). Is there any nonparametric ...
2
votes
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. ...
1
vote
0answers
424 views

Difference between MANOVA “post-hoc” tests of between subjects effects and between subjects one-way ANOVA?

When I run a 2x4x5x6 (Sex*AgeGroup*HighestDegree*Ethnicity) MANOVA (with 20 dependent variables) in SPSS, it presents tests of between subjects effects for each of the IVs and their interactions after ...
2
votes
1answer
204 views

Variables which sum to a constant - ANOVA, MANOVA or none of these?

I asked a group of subjects to make a series of 12 binary choices regarding preferences. Let's say for arguments sake, these were between ugly (ug), attractive ...
2
votes
2answers
664 views

Multiple dependent variables in factorial design

I have a 2x2x2 factorial design with two dependent variables (lets say height and weight). I can examine the effect of the three factors for each dependent variable separately. But I also want to ...
4
votes
1answer
2k views

How to interpret type I (sequential) ANOVA and MANOVA?

My primary question is how to interpret the output (coefficients, F, P) when conducting a Type I (sequential) ANOVA? My specific research problem is a bit more complex, so I will break my example into ...
3
votes
2answers
298 views

Over enthusiastic MANOVA in R

In recent research I pursue a MANOVA model on a dataset comprised of 50 measured characters and several grouping factors that I need to test. When I use something like this ...
13
votes
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
votes
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 ...
9
votes
3answers
3k views

MANOVA and correlations between dependent variables: how strong is too strong?

The dependent variables in a MANOVA should not be "too strongly correlated." But how strong a correlation is too strong? It would be interesting to get people's opinions on this issue. For instance, ...
2
votes
2answers
3k views

When to interpret multivariate tests when performing repeated-measures ANCOVA?

Yesterday, I ran a repeated-measures ANCOVA. The purpose was to determine the usability of two computer systems, call them 1 and 2. Each subject completed three (conceptually different) tasks, call ...