Questions tagged [manova]
Multivariate ANalysis Of VAriance (MANOVA) is a generalization of ANOVA for the case with several dependent variables.
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What is the appropriate test comparing two groups with pre-post design?
I have two groups (control and experimental), both have pre- and post-test scores.
A colleague of mine suggested that I use a one-way MANOVA to test the effectiveness of the intervention, with pre- ...
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How to perform a joint significance test for multiple coefficients across several regression models?
I have 10 regression models, each regressing a different dependent variable $ y_i $ (for $ i = 1, 2, \ldots, 10 $) on the same independent variable $ x $. Each model produces a coefficient for $ x $, ...
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Mixed modal MANOVA or something else?
I am once again asking for your help. I am developing a research proposal and I am a bit confused. I have a randomized controlled trial (RCT) for testing the efficacy of a therapeutic intervention, in ...
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Why Do Different MANOVA Test Statistics Produce the Same Approximate F and P Values in R?
I am using the manova() function in R to perform multivariate analysis of variance on my dataset. I have tried using different test statistics such as Pillai's ...
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Is it possible to run MANOVA without adjusting the Alpha level?
I have 11 dependent variables and two independent variables. I need to see the differences between the gender and academic level concerning the 10 most frequent grammatical errors and the total number ...
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What non-parametric tests can be run to check the mediation analysis, since my data is not normally distributed?
I have two IVs (computed scores from likert scale) and one DV (computed scores from likert scale) IVs are Depression and Anxiety scores and DV is Social Connectedness scores. These are cintnuous. I ...
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For a MANCOVA or MANOVA, is it true that "the pattern of group differences expected for all of the dependent variables is in the same direction?"
I'm considering performing a MANCOVA for a project, and during my research I came across a statement that gave me pause, quoted in the question title. You can find the statement in the middle of the ...
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Which Analysis to Use for 2 Likert Scale Questionnaire Groups With Multiple Responses
I have a data set that I acquired through running a questionnaire. The questionnaire consisted of participants having to rate 80 different phrases using a 5-point Likert scale; ranging from Strongly ...
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Distribution of between-group sum of squares (SSB)?
Consider a standard multivariate random effects model
$$\mathbf{X}_{ij} = \boldsymbol{\mu} + \boldsymbol{\alpha}_i +\boldsymbol{\varepsilon}_{ij}$$
for $i = 1,\ldots,m$ and $j = 1,\ldots,n_i$, and ...
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Why does factor appear significant in 2-way ANOVA but not by inspection (mean +/- sd or error plot)?
I am puzzled about the result of a 2-way ANOVA analysis. The factors are categorical and non-random and the sum of squares used is constrained type III (the choice of categorical or SS type does not ...
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In a repeated measures ANOVA, is the pairwise comparison result still valid if sphericity is not assumed?
For the pairwise comparison, the p value is less than 0.001. However, the p value for Mauchly's test of sphericity is also <0.001. I believe that SPSS automatically applies the Greenhouse-Geisser ...
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Multivariate analysis with lmer and lmerTest
I'm dealing with compositional data (data that sum to 1). They are inherently multivariate. One way to analyse compositional data is with a ilr (isometric log-ratio) transformation. I'm following the ...
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Intuition behind between-group covariance matrix from MANOVA?
Suppose that we have samples from $m$ different $p$-dimensional normal multivariate distributions, where they share a common covariance matrix $\Sigma$ but the mean vectors may be different for each ...
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Which statistical test to use analyzing multivariate brain scan data (Channels, Frequency Bands, Measures)?
As a Computer Science student inexperienced in statistics, I'm looking for some advice on selecting the appropriate statistical test for my dataset.
My data, derived from brain scans, is structured ...
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Question about Degrees of Freedom in MANOVA
res <-manova(cbind(Sepal.Length, Sepal.Width) ~ Species, data=iris)
summary(res)
When running the above code, the result will be as follows:
...
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Repeated measures MANOVA returning Pillai greater than 1
I am attempting to investigate the presence of a multivariate main effect using a repeated measures MANOVA.
I couldn't figure out how to include a table to share some data so I have included a ...
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what is the equivalent of manova for pretest postest data for paired groups?
how can i test for differences in pretest and posttest of anxiety and aggressive behavior in regards to the experimental group only? noting that i have already conducted a MANOVA and found statistical ...
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Quantitative Proteomic Analysis : ANOVA or MANOVA?
So, this may be a really dumb question but I'd rather ask it now than 3 weeks later when I'm neck deep into problems. The title is kind of self-explanatory but I'll expand a bit :
I've been tasked of ...
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Follow up to MANCOVA and any possible alternative analyses
In my research, I have two categorical IVs and a DV:
A factor with 4 levels (mindset, encompassing 4 mindsets)
A factor with 2 levels (condition, encompassing 2 conditions)
A DV which is a composite ...
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Does it make sense to compare two different DVs on a within-subjects t-test or MANOVA (or ANOVA?)?
Let's say I have 3 different drug doses: A, B and C and I have two DVs: blood pressure and pulse. I am interested in finding out if the three doses differentially impact the two DVs (i.e. if at dose A ...
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Which stats test--MANOVA or Mixed Effects?
I need to see if there's a statistical difference for each ID between CHLA, CWBA, and CH and what that difference is, AS WELL AS, if Species Type is a factor. Which R package would do this? I have the ...
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All Individual DVs significant, but overall MANOVA not significant
I'm getting a weird result. Please check out the SPSS output below for CONDITION. All the DVs are showing significant results individually but the MANOVA is not significant. I've never seen this ...
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Failure to meet the Scalar Invariance model
I did an 6 group experiment and I ran the multi-group CFA and failed to meet the Scalar model. I understand that the analysis should not compare means in that case but I can do MANOVA and SEM/...
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What to do when I have insignificant results in one-way MANOVA?
I am currently in a blind fury attempting to write up a dissertation on the effects of positive and negative coaching on the performance of Rocket League players.
As far as I can gather, a one way ...
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Analysis of longitudinal data with a change in DV - SEM, MANOVA or not possible?
I have a dataset in which a (latent) construct (e.g., math performance) is measured at different time points using different psychological tests.
The first data point is comparable to an assessment ...
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2-way ANOVA interaction between a factor with itself, does not make sense?
I have done a DOE that I am in the process of analyze with a two-way ANOVA.
The DOE has been generated by the JMP software and I specified that I want calculate the main effects and the 2nd ...
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Which type of statistical analysis to run in R with 2 treatment types in my study?
(Originally asked on Stack Overflow, reposting here after a commentor mentioned this is a better place to ask it.)
I have a seed germination study that I am trying to analyze. In this study I had 4 ...
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Which statistical test - which sample is driving differences
I'm assessing whether the relative abundance of bacterial communities are different across two treatments.
I have a control (n=3), a food compost treatment (n=3) and a biosolid compost treatment (n=3) ...
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How does one create comparable metrics when the original metrics are not comparable?
The problem I have is that I have several groups (say 3 to make discussion concrete) with observations from a true but known distribution $p^*_1, p^*_2, p^*_3$ (or 3 populations). I can compute some ...
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Mahalanobis Distance critical alpha cutoff [closed]
I have two predictors and five dependent variables. I'm trying to figure out what the critical alpha cutoff for Mahalanobis distance is for a model with 5 DVs to check for assumption of multivariate ...
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