Questions tagged [manova]

Multivariate ANalysis Of VAriance (MANOVA) is a generalization of ANOVA for the case with several dependent variables.

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How to interpret type I, type II, and type III 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 ...
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Multivariate multiple regression in R

I have 2 dependent variables (DVs) each of whose score may be influenced by the set of 7 independent variables (IVs). DVs are continuous, while the set of IVs consists of a mix of continuous and ...
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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 the ...
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T-tests, manova or logistic regression - how to compare two groups?

I'd like to check whether women and men differ on those five variables, that can be correlated with each other. The groups are also not equal with 589 females and 293 males. The solutions that come to ...
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How is MANOVA related to LDA?

In several places I saw a claim that MANOVA is like ANOVA plus linear discriminant analysis (LDA), but it was always made in a hand-waving sort of way. I would like to know what exactly it is supposed ...
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A non-parametric repeated-measures multi-way Anova in R?

The following question is one of those holy grails for me for some time now, I hope someone might be able to offer a good advice. I wish to perform a non-parametric repeated measures multiway anova ...
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Post-hoc tests for MANOVA: univariate ANOVAs or discriminant analysis?

I am using a MANOVA test to compare nine different dependent variables (from neuropsychological and neuropsychiatric assessment) between three groups. The output shows a significant influence from ...
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How can MANOVA report a significant difference when none of the univariate ANOVAs reaches significance?

I would just like to ask if it is normal for the values from my multivariate tests to be significant but for the values from my univariate tests of between-subjects effects table to be insignificant. ...
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Why is Pillai's trace equal to partial eta squared in a repeated measures MANOVA (profile analysis)?

I conducted a repeated measures MANOVA using the GLM command in SPSS, with one between-subjects IV (two levels) and 10 DVs (repeated measures). According to Tabachnick and Fidell (Book: Using ...
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Assessing group differences on multiple outcomes

I have one independent variable with two levels: Gender (Male and Female), and dependent variables will be composed of three test scores: Impulsivity, Assertiveness, and Social Desirability. My ...
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Does one need to adjust for multiple comparisons when using MANOVA?

There are 10 dependent variables and 2 groups. When I wanted to compare 10 dependent variables between two groups, I performed MANOVA. I wonder if there is a multiple comparison problem in that case. ...
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When is MANOVA most useful

I see that if one has multiple dependent variables, one can analyze them together with MANOVA. Following are results of MANOVA on commonly used iris dataset: ...
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Why is it possible to have a non-significant MANOVA but multiple significant univariate ANOVAs?

The only source I have for this being possible is this wikiversity page on MANOVA, but it does not explain why it is possible.
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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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How to follow up a factorial MANOVA with discriminant analysis?

This is a follow-up to to my previous question: How can MANOVA report a significant difference when none of the univariate ANOVAs reaches significance? I have two IVs with each having three levels ...
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How to work out Effect Size for a MANOVA using G*Power

I'm using G*Power to work out how many participants I need. I'll be using a MANOVA, I have two independent variables (Male and Female) and they will be answering 13 different questionnaires so 13 ...
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Should I use ANOVA or MANOVA for repeated measures experiment with two groups and several DVs?

I have data on two groups of subjects. Each group was measured three times, and there were four dependent variables all measuring the level of fitness (score of a person's heart rate in five stages ...
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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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Is there a non-parametric equivalent of factorial MANOVA (at least 2x2)?

I have searched far and wide for a non-parametric test for the 2x2 between subjects MANOVA I would like to do. So far I have found non-parametric equivalents for factorial ANOVA with corresponding R ...
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How to run Repeated Measures to find difference between gender (without change of condition)?

I would like to test for the difference of measures between genders. Repeated measures were carried out. What test would you suggest is best for this and what would be the degrees of freedom ...
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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, ...
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MANOVA as protection against Type I errors

OK, so I have absolutely scoured the internet, and it appears that there is consensus (among people who really care about Type I error) that doing a MANOVA before doing multiple ANOVAs does nothing to ...
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MANOVA with unequal sample sizes

I have data for 352 response ratings that have been categorized as "Low," "Medium," and "High." I would like to compare the differences of five variables across the three categories to see which ones ...
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Choosing between a MANOVA and a series of t-tests when comparing two groups

I have to analyze the data from a study in which two groups of subjects (total sample $n = 30$) were tested on 4 cognitive tasks, all related to executive functions. For each task, I have accuracy ...
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Permutational MANOVA and Mahalanobis distances in R

In this paper Anderson, M.J. (2001). A new method for non-parametric multivariate analysis of variance. Austral Ecology, 26, 32–46 I found very useful MANOVA approach that can, to some extent, ...
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MANOVA multiple comparisons with equivalence testing

For a MANOVA with $n$ variables, I would like to do pairwise comparisons between $k$ levels for one of the variables. What is the suitable method to adopt for ...
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Many dependent variables, few samples: is this an example of "large $p$, small $n$" problem?

"Large $p$, small $n$" typically refers to "many independent variables, few samples". In my case, I have $1$ independent variable, $300$ dependent variables, and $n < 20$ samples. Thus, my case ...
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How to read the output from MANOVA?

I'm testing if/how the two factors C and V affect the dependent variables fric and ...
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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 ...
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Comparing differences between overlapping groups

I am trying to analyse the differences between people who vote in the European Parliament (EP) elections and people who vote in national elections, based on the EES dataset$^\dagger$. The objective is ...
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What is PERMANOVA and when to use it instead of multivariate ANOVA? [closed]

I have some data on spatial and temporal variation of macrobenthic species. I tried to test the difference between seasons and sites, and noticed that PERMANOVA is recommended in the literature. (But ...
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How to predict 4 dependent ordinal DV from 6 ordinal/nominal IVs

My question is simple. I got 4 ordinal variables and I wish to investigate the extent that other 6 ordinal/nominal variables predicts their values. I know that ordinal regression is the appropriate ...
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What are advantages of MANOVA over a series of univariate analyses?

What are the advantages of doing MANOVA of 2 response variables together rather than individual, separate analysis of response variables? What further information does it provide? Is it that the 2 ...
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Carry out power analysis for MANCOVA using G*Power

There are helpful questions and answers for how to calculate the required sample size (or carry out a power analysis) for MANOVA, but not for MANCOVA using the freely-available G Power software. Is ...
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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 ...
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Mixed Model using lme4 in R for multiple response data

I have some questions about how to translate my data structure and research Qs to syntax for the lmer function (lme4 package). I am looking to predict teenagers scores on a mental health questionnaire ...
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Repeated measures ANOVA or MANOVA (SPSS)

I have an experimental design of two independent groups (pregnant/non-pregnant), in which each person has described past memories and future episodes on different variables on a scale from 1-7. ...
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What is the best approach for this set-up: RM ANOVA / MANOVA / Mixed-Models?

I have a simple dataset from a within-subject design. Each participant provided a verbal description of 3 stimuli. The descriptions were coded so that they consist from objects each belonging to 1 out ...
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