Questions tagged [manova]

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

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Non-parametric testing for three way interaction effects

I'm looking for the appropriate test to perform to determine if there is a three-way interaction effect on my (non-parametric) likert-scale data. My data currently has a dependent variable with values ...
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When running MANOVA and you have a significant Levene's Test prior to the univariate tests, what is the best course of action?

When running MANOVA, if Levene's test is significant, aka homogeneity of variance is violated, before the univariate output, aka the test of between-subjects effects, what is the best option after? I'...
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Multiple t-tests after MANOVA

I have data on many biomarkers from flow cytometry in a case-control design, and I need to evaluate which biomarkers differ between the two groups. I performed a MANOVA and the results were very ...
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Comparing germination times between treatments within two soil types for several species. Nested Anova?

I need to compare the germination times (days till germination) of several species which have had 3 different treatments applied to them. However, the treated seeds have also been placed into two ...
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MANOVA: Repeated measures, within-between interaction GPower HELP

I am conducting a randomized control trial with a waitlist control group and an immediate treatment group. I have run an A priori MANOVA: repeated measures, within-between interaction G*Power analysis ...
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1 independant variables, 15 dependant variables - correct analytical procedure?

The research looks for a gender difference in product ratings, gender was collected (Male/Female) and rating on a 5-point scale. Each participant rated 15 products from 3 different categories. What ...
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What is the alternative to the 2-way ANOVA when the data are non-parametric in addition to being non-ordinal

I understand that the scheirer-ray-hare test would be a good option, however, the literature mentions that it is not reliable in my case because it uses data on an ordinal scale. What alternative ...
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Multivariate Statistical Techniques Based on One or More Populations

I have a question I am thinking through: ...
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MANOVA test statistics with GLM Multivariate Multiple Regression in R

Good afternoon! I am currently working on my master thesis and I am a bit stumped on how to proceed practically with my analysis. I am running a Multivariate Multiple analysis on a dataset, so I have ...
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How to report F = 0

Can anybody tell me, please, if I need to report in my paper if F = 0 in two-way ANOVA? My samples are quite small: 6 participants in one group and 5 in another. There is also a possibility their ...
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MANOVA Repeated Measures

I hope somebody can help me with my confusion. My dependent variables are: emotions, interest, and attitude change, while independent variable is type of message: a) self-appraisal message b) family-...
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MANOVA: How to identify the most relevant dependent variables

I am facing a problem with a big number of dependent variables and relatively small sample size. Not all dependent variables might be relevant, though. As multivariate analysis of variance (MANOVA) ...
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Power Analysis with GPower repeated measures MANOVA within-between interaction

I am running a longitudinal experiment over 9 months. I have 2 dependent measures (water, electricity) and 5 groups (conditions, 4 experimental, 1 control). The conditions are the "between"...
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Do I need a two-way MANOVA?

I am testing for differences between 3 groups. I have 2 dependent variables which are continuous data. However, I am confused about my independent variables and if a two-way MANOVA test would be ...
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Why repeated measures output gives different output than MANOVA (SPSS)?

I see that this topic was closed few days ago, because it concerns specific context (data). No actually it does not. This is something that happens with any two variables that u have (at least 2) and ...
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A model combining mixed design and MANOVA?

I just encountered data with the following details: We have 2 variables repeated twice (pre and post) Explanation: fist variable is thinking test (done on pre and post periods) then the second ...
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MANOVA when considering change in variable

BLUF: Is it reasonable to do a MANOVA of change in the dependent variables, or do I need to account for differences in the initial conditions of my samples in some other way? I am doing an analysis ...
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How to perform a 3-way MANOVA correctly in R?

An experiment evaluated 3 factors and 3 responses to treatments. The selected factors were the chemical used (Chemical), the mixing speed (...
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What type of analysis to do for Dissertation- EMOTION RECOGNITION

In my study, participants take part in the State Trait Anxiety Inventory (STAI) where they are ranked into high or low trait anxiety groups. Participants are then shown multiple videos of 7 different ...
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If data is square rooted to assume normality, should the data used to test with Levene's Test for Equality of Variance also be square rooted?

I am going to run a MANOVA, two of the assumptions are normally distributed data and equal variances. I had a data set that non-normally distributed. I square rooted it, and it is approximately ...
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How to account for mediators in ANOVA?

So I have two IVs (customization, purchase type), three mediators (self-expressiveness, social connections, evoked comparisons) and one DV (happiness). Purchase type is either experiential or material,...
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Which conditions need to be checked for a MANOVA with repeated measures?

A friend of mine is writing her master's thesis in physical therapy and has a question about the repeated measures MANOVA model. I am asking this question here for her and hope someone can help her ...
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rm MANCOVA's univariate result does not match the post hoc results. Strange!

I have run a repeated-measures MANCOVA with 2 dependent variables and a 5-level repeated-measures intervention. The multivariate effect of intervention is significant. The univariate effect of ...
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Should I use a repeated measures MANOVA or several repeated measures ANOVAs?

I'm doing a randomised controlled trial, it has four dependant variables each measured at three time points. The data is normally distributed. My question is how to analyse this. I'm wondering whether ...
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glm - correction for dependent variables

I am currently performing an NMDS in conjunction with glm to analyse lipid patterns. However, my data has two levels (Horizon) which make my variables dependent. Previously I had used the "+Error&...
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Analyses of Gene expression dataset, what stat test?

I was wondering if there was a way to analyse my RNA seq dataset in a way that I could work out which day the specific gene I have is most significantly expressed? I have a RNA seq dataset with 6 days ...
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Multi variate analysis

I am performing land use/ land cover classification. I want to see relationship between sample pixels of different groups. for example I have 6 groups (for e.g. Water, Grassland, Forest, Built-up etc.)...
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MANOVA MLE proof

I checked several textbooks and papers, they both give the result directly without any proof, so I'm trying to prove the MLE for MAOVA myself. For the following model, where $\epsilon \sim N(0, \Sigma,...
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Three-way MANOVA Interpretation

I'm interpreting a three-way MANOVA as part of my research, and have come across an interpretation challenge, with three independent variables (Factor A, Factor B, and Factor C) and two dependent ...
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ANOVA? MANOVA? repeated ANOVA? what test to choose for my purpose?

I'm having a hard time to choose the correct test that fits the study I conducted and if the general approch is correct. The test design is as follows (simplified): 10 different participants rode ...
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MANOVA or difference scores?

I have a research design where participants are asked how much they want to donate to two different children in need. The goal is to measure whether they will be equitable (give equally to both ...
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comparing ratios between every sample across groups

I'm pretty new to statistics. I have some data sets: ...
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Challenging robustness to violations of multivariate normality

I am generating multivariate normal (MVN) data and evaluating power of MANOVA in R. For instance, I simulate a factor A with two levels, and obtain $\boldsymbol{y}_{A_1} \sim MVN(\boldsymbol{\mu_1}, \...
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Differences between RM Anova and RM Manova

I've a conceptual question here regarding the use of ANOVA and MANOVA for fully within (repeated measures) data. It seems that with no covariates or other factors, a repeated-measures ANOVA and a ...
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Replicating an SPSS manova in R

I'm trying to replicate the top part of the SPSS manova table 3.17 shown on page 127 in this book (just type 148 in the page ...
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How to compare two treatments with multiple data entries and levels of classification?

I'm having a problem with my statistical analysis. I have 2 different groups of rats ($n = 10$, $n = 11$). Each group received a different conditioning protocol (Cod1 and Cod2) and I want to know if ...
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What is a cancelling-out effect in MANOVA, can we simulate it?

Below is a quote from page 143-144 of this book. It talks about "a cancelling-out effect" that happens when a univariate test on total test scores is used to find if two groups' performances ...
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G*Power two-way MANOVA - how to?

I'm confused about how to run an a priori power analysis in G*Power for a two-way MANOVA. Specifically, I have two predictor variables, each with two levels (e.g., A: A1, A2; B: B1, B2). I then have ...
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Suitability of one-way repeated measures MANOVA

I'm undertaking a research study where I want to look at the difference between the value of a variable before and after an intervention. I've been suggested the one-way repeated measures MANOVA ...
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1answer
120 views

Treat year as a fixed effect, random effect, or covariate?

I have a dataset of fish species from different sites within a harbour collected over 17 years. The dataset consists of 1,042 sampling transects collected at 6 specific locations where fish were ...
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Should I pool samples or leave them separate before running a PERMANOVA?

I have a dataset of fish species from different sites within a harbour collected over 17 years. The dataset consists of 1,042 sampling transects collected at 6 specific locations where fish were ...
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1answer
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Which statistical test is correct to compare two groups of very different sizes?

I have two groups that consist of the tree fraction and elevation. The sizes of the groups are very different, and the mean of tree fraction and elevation are included in the table, below. They are ...
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full information maximum likelihood for missing data in R combined with a MANOVA

i would like to do a manova with full information maximum likelihood to reduce missing data. i dont find any help in the internet, just how to calculate a normal manova, but if i add the usual command ...
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MANOVA with repeated measures?

I am have managed to get through the first level analysis but I am stuck in the post hoc as to what statistical analysis I should use. I gave one 40-cue and two 20-cue (three test total) Word ...
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261 views

G*power -> MANOVA (global effects) confusion with given effect size

I'm working with G*power to calculate the sample size for my experiment. At the moment I'm a little bit confused handling the effect size values. I have 3 IV (3 groups) and 2 DV => so i will use ...
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Multivariate Linear Mixed Model with Categorical Predictors? Or MANOVA?

We would like to analyse two continuous reaction measures in a multivariate model using only categorical predictors and are looking for the best model to do it. We are using R, and have not yet seen ...
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Testing differences between groups in time course experiment

I want to analyze my data of glucose tolerance test experiment. I have two groups- test and control, and we measured the glucose levels at 5 time points (0,15,30,60,120 min). I want to test for ...
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To use ANOVA or MANOVA, One-way or Two-way? In the context of my Practical Example

I have the following practical example, of which I am trying to understand which statistical model will be best to apply. MANOVA? One-Way? Two-Way? Objective: To see if there is a statistically ...
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1answer
32 views

Method of Data analysis

For my research I am comparing actual purchases (in amounts of products bought) in different conditions. I'm examining whether applying a certain promotional intervention improves the amount of ...
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Multivariate ANOVA in python

I'm running a multivariate 2-way analysis and would like to know how to proceed. Basically, I have two effects group and time ...

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