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Questions tagged [manova]

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

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3 views

What stat analises to use? In SPSS

What analises to use? MANOVA? And how? I have a following design: Two groups made the same task and the result I have in Reaction times ( dependent variable). I have three additional variables (...
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In VEGAN ADONIS, what does "method='bray' do when I pass in a distance matrix I already have (UNIFRAC)?

Suppose I have a distance matrix created by applying the weighted unifrac measure. For instance, using a phyloseq object: ...
18 views

What analysis should I use?

I have a dataset with 5 years of data, and am looking at trends in outcomes over time - so I have a categorical independent variable of Year, and 7 dependent variables, 5 of which are boolean, 2 of ...
31 views

Are my PCA groups significantly different?

I am studying the feeding behaviour of deep sea fishes, and have produced a dataset containing percentages for 20 different fatty acids (totalling 100%) for 32 individual fish. I have performed PCA (...
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What statistical method should I use to quantify a tests ability to separate by category?

Say I have the table of results below. In Test 1 categories a, b, and c produce results which are clearly distinct. In Test 2 the categories produce some separation, though not entirely. Test 3 ...
39 views

Do I need to correct for p-value when doing repeated ANOVA test?

We are investigating the relationship between smoking status and the hormone level. Smoking status is X(three-level) and the level of the hormones is Y(continuous variable). However, the smoking ...
16 views

Why does adding a dependent variable to a MANOVA remove significance?

We designed an experiment with 2 discrete independent variables (IV), 1 (measured) confounding variable, and 2 dependent variables (DV). We hypothesize that the two IVs interact on both DVs. Right ...
29 views

Does ordinal logistic regression substitute for “multifactorial Friedman test”?

I'm searching for an appropriate statistical test, more or less a multifactorial version of Friedman test. But I'm also wondering if Wilcoxons rank sum test can do the job. Expt design: 10 larvae ...
24 views

Is a mixed effects logistic regression appropriate here?

I have recently conducted an experiment to investigate if a certain Design Type and Question type would influence the performance of participants within a calculation task measured by success (yes/no) ...
47 views

A is correlated with B/ A has an impact on B

I've been reading papers to collect materials for my bachelor thesis, and I came across this question and wasn't sure if my understanding of the concept is correct. Is "A is correlated with B" the ...
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Is there a maximum amount of dependent variables for MANOVA?

I have a dataset where the influence of 3 manipulations (vs placebo) is tested on 17 different outcome measurements. To avoid having to run 3*17 = 51 ANOVAs to see which type of manipulation has an ...
6 views

How to perform MANOVA with categorical independent variables

I have a dataset where the independent variable is sieve size (categorically either 25, 63, 100 or 150), and the dependent variables are length and width. ...
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Question on interpretation of covariates in repeated measures analysis [closed]

I am currently having difficulties with the statistical analysis of my research. My research is the effect of a drug on 3 measures, upper limb impairment and 2 qualtiy of life measures at two time ...
89 views

UPDATED: Multiple lme models or MANOVA with random effects? Problem with singular fit

hope you can help me with this issue! In my study I have 4 outcome variables which correspond to the ratings I collected for 4 different psychological dimensions (liking, comfort, approach, ...
10 views

Will Three Manovas be appropriate?

I’m running a correlations analysis. Hypothesis is that group 1 will score higher in subscale measures of socioemotional dimensions. Dependent variables- three different learning style groups(smallest ...
10 views

Repeated measures does not give result

For my thesis, I have to perform a repeated measures analysis. I already found videos and articles about how to perform this and it works with the data that they use in these videos. However, if I ...
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Why analysis of variance should I use for my clinical trial proposal?

I have 2 independent variabiles(2 treatment groups) and 2 outcomes, measured at 3 time points. Is manova the analysis I should use?
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Manova different output each time

I ran a MANOVA on a random subsample of a dataset when the subsample meets most of the assumptions. I tried running it again on a different subsample, and again... Each time I have different results: ...
22 views

Do ANOVA & MANOVA require balanced levels?

I have one independent variable with two levels, or categories, and four dependent variables. When doing a MANOVA or ANOVA test, how important is it for the number of observations in each category to ...
9 views

Comparing language loss among two types of bilinguals

I have two groups: Simultaneous and Sequential Bilinguals I have three measures: grammatical complexity, lexical complexity, and grammatical accuracy (all are quantified differently) I will conduct ...
17 views

Violation of univariate normality of residuals for DV in MANOVA. Can i trust non-significant results?

My design is one IV (control vs patient) measured on 3 different composite structures, consisting of 8, 3 and 2 DV from a behavioral test. The measures are t-scores based on norm groups for the test. ...
13 views

2 way ANOVA one repeated measures factor and percentages

We're investigating the effect of two different types of feedback on motor learning. We have two groups that performed 4 different tests and we'd like to see whether an interaction between these ...
19 views

PCA plot does not show a statistical difference even though the single factor MANOVA was used

My single factor MANOVA showed that there is a statistical difference between the red and black (which represent the effect of treatment given) : the P value was <0.05. But in PCA there seems to ...
24 views

How should I arrange my data and which appropriate test can I use?

I have conducted an experiment to determine if my treatment affects performance of athletes. Each participant will undergo the control and experimental trial. I measured a few variables: 1) Total ...
28 views

Different main effect in MANOVA and two-way MANOVA? Which one do I use?

I did a MANOVA in SPSS and there is a significant main effect of the IV on only one of my two DVs. Then I did a two way ANOVA to include one more IV, but otherwise use the same variables I've used in ...
29 views

Should I use a MANOVA and then a two-way MANOVA or just the two-way MANOVA?

My research questions: Is there an effect of the independent variable on the two dependent variables? Is this effect of the independent variable on the two dependent variables stronger for females ...
273 views

two-way MANCOVA

I am currently trying to run a two way MANCOVA as I have to independent variables with 2 levels each 1) sleep chronotype (late and early) and weekly sleep loss (high and low). I have four dependent ...
16 views

What type of test do I use in G Power?

I've got 1 IV with 2 levels (within-subjects) and 4 VD's (with 7 levels). What type of test do I use in this case ? Thank you
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Appropriate statistics for multivariate genetic analysis

I have a question on the most appropriate statistics for our genetic project. We have a dataset consisting of genotypes at several loci (10 SNPs) and phenotypes (the same person can be a control for ...
12 views

Multiple comparisons, should I run a one-way multivariate analysis or can I use Mann Whitney?

I am analysing some study data and am unsure the appropriate statistical test to use. The study involves watching a film. 50% of participants saw version 1, 50% saw version 2 - (the difference in ...
85 views

odd insignificant results using pairwise.perm.manova

I am trying to complete pairwise comparisons of 9 forest communities. Communities were significant at p < 0.001 using adonis. However, when I use the same bray curtis matrix with the pairwise.perm....
22 views

Can I do multiple ANOVAs without correcting for multiple comparisons?

In my study I have one repeated measures factor that I manipulated on two levels and one between-subjects factor that I manipulated on 3 levels (three groups), resulting in a 2x3 design. I also have ...
34 views

Help with normalising data that has A LOT of 0s [duplicate]

I recently am analysing my results (behavioural, observation-based data), and I realised that my data are non-normal. No problem, this happens in behavioural data a lot, and I thought I just needed to ...
98 views

Checking equality of covariance matrices using Box's M test in multifactor MANOVA

With only one factor (independent variable) in multivariate analysis of variance (MANOVA), Box's M test can be used to check the equality of covariance matrices. ...
114 views

Unequal sample sizes for npmv

I have a similar question as this: Nonparametric test for MANOVA in R violation of homogeneity and unequal group sizes which is unanswered. I have a dataset for which I want to perform a MANOVA. ...
20 views

Is there a MANOVA test on circular variables?

I have a population 4 individuals moving in different directions in 9 different compartments. The movement is not coherent between the different compartments, but I suspect that it is coherent between ...
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Which statistical test for an experiment with 3 IV's and 2 DV's?

I am trying to figure out which statistical test to use in order to test the effect of manipulating 3 independent variables (each with 2 levels) on 2 dependent variables (both continuous). If anyone ...
74 views

unbalanced 3 factor ANOVA in R

We are working on an fMRI study. We have the following factors to consider: -Stimulus (4 levels) -Brain structures (42 levels) -Group (3 levels) Each participant belongs to one group and received the ...
22 views

MANOVA - Can I use DV's with different scales?

Maybe it is a dumb question, but I'm not finding any reference that specifically answer to this question. Is it possible to use two DV with different scales in a MANOVA or do I need to standardize? If ...
46 views

How to interpret MANOVA results after adding gender, splitting the file?

I am analyzing my 2x3 between subject design with MANOVA in SPSS at the moment. In the main model, there is 2 IV's and 2 DV's. Result of the test is 1 main effect and no interaction effect. In an ...
27 views

Why does One Way ANOVA not have an SSE Term?

For a Two Way ANOVA with two factors A and B, the Sum of Square equation is:- SSTO = SSA + SSB + SSAB + SSE Where, SSTO = Total Sum of Squares SSA = Sum of Squares due to Factor A SSB = Sum of ...
37 views

how/what post-hoc when covariate is significant in MANOVA?

I am running MANOVA with group (patient vs hc) and covariates (age (interval), gender (categorical), handedness (categorical)) on a number (3-8) variables (metabolites; interval). groupmembership ...
242 views

MANOVA with variables from different datasets

I conducted several experiments where I have one underlying independent variable (tree species, IV). Each of these experiments gave me one dependent variable (DV), like bark pH, rugosity or the water-...
146 views

Find significantly differences between multi-variant groups

I have 11 groups, each consist of about 200 observations, and each observation has 2 variables (which are actually the first two PLS components if it makes any difference). Each group is a substance ...
24 views

What is the correct number of measurements and groups in the following Design?

I using GPOWER: "Anova repeated measures within factors" and need help in giving a correct number to the following inputs: Number of groups. Number of measurements. The design is as follows: I have ...
15 views

Correct group of factorial and repeated-measure ANOVA

I'm currently having trouble defining what type of ANOVA I need to run as well as how to run it correctly. This is the following setup: I have 4 groups of 30 people doing a 2-session task (one after ...