Questions tagged [manova]

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

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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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28 views

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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55 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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20 views

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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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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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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364 views

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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69 views

SEM Instead of MANOVA

I do not have sufficient reputation to comment on a question, so I hope this post is acceptable. Regarding the accepted answer to this question: How to do Simple Confirmatory Factory Analysis/SEM in R?...
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Recreate SPSS within-subjects factor in R

I am trying to recreate SPSS syntax in R. The problem is: I can not figure out how to recreate a within-subjects variable. In SPSS ("Analyze -> General linear model -> repeated-measures&...
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112 views

Is there a smallest possible sample size for MANOVA (post-hoc)

I am testing two DV and two IV using a two-way MANOVA. I have four groups. I had used g*power to recommend a sample size, however I have not yet achieved this recommended sample size. Instead I have ...
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Are there problems with using Ordered Quantile (ORQ) normalization for Multivariate Analysis?

This is intended as a general question, as a Google search for -- "Ordered Quantile" "ORQ" normalization "Multivariate Analysis" -- returns nothing. This option is listed ...
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Small, unequal, sample size significance using MANOVA

I am testing the hypothesis, "there is no difference between 3 materials", with a small sample size. I have 3 materials and 2 DVs (test 1-2). They also have a different number of ...
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Choice of test in a pre-post scenario

I would like to test whether there is a significant difference in outcome in a pre/post scenario. I have the following set-up: Measured level of concentration of A (...
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Does the order of terms matter in adonis.II?

I'm a bit confused. The order of terms matter in adonis2, but how about adonis.II? Somebody wrote here : https://stat.ethz.ch/pipermail/r-sig-ecology/2018-October/005822.html that ordering, does not ...
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Comparing the means of latent variables in a CFA model measured at two different times in R

I have a CFA model with 7 latent variables and about 4 items per construct, I'm using R with lavaan for the CFA, $N\approx 3500$. My model looks like this: ...
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Aggregating P-Values from (M)ANOVAs Run *Independently* In Each Subject?

My issue is this. I am measuring the response of neurons in the brain to visual stimuli and how they respond to color/shape combinations; I am examining a collection of neurons from several different ...
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193 views

How do I run a two-way repeated measure MANOVA in R?

I am trying to run a repeated measure MANOVA in R, with two within subjects independent variables and three dependent variables. I converted the df in long format and I am now trying to run the ...
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Which test should I use to compare the effect of a parasite infection on gut microbiome across time serie data point

I am interested in the effect of an intestinal parasite infection on the rat gut bacterial community. I have two groups of rats ("infected" and "non-infected") each consists of 6 ...
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54 views

Is this a proper use of mixed modeling?

I admit I'm fairly new at statistical modeling and so I'm not confident in the method I am using. Using LC-MS/MS, I am monitoring the degree of post-translational modification of specific peptides by ...
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vegan::adonis2() for randomized complete block design with main-plot, split-plot, and nested effects

I coded my adonis2 formula following the answer below. The original r-forge is not accessible anymore, though. I used the suggested model on my data but I got the ...
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2x3 Mixed Factorial Design or Pre-Post Design?

I am conducting a study for a MSc., and was told by my supervisor that my design would be a 2x3 mixed factorial design, but it seems like it might just be a pre and post test intervention design (I ...
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MANOVA and Hotellings tests

I have a matrix with 33 columns, the matrix can be found here: https://pastebin.com/3pAAGNti Each line of the matrix belongs to a specific group, from 1 to 8. The group number is stored in the last ...
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Test for paired proportion data

I want to test for differences in the connectivity of two different brain regions (A and B) measured in 100 subjects. For each brain region, I have measured connectivity to 150 other brain regions (i....
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ANOVAs with dichotomous and multicategorical IVs: how to compare subcategories? [closed]

I have continuous DVs and my IVs are two categorical variables, one is dichotomous (low/high) and one is multicategorical (1/2/3/4). I'm interested in comparing each group and their interactions. For ...
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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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MANOVA for equal sample sizes, non-independent samples, and heteroskedasticity for time series data

I am looking for a MANOVA-like procedure testing for equal mean vectors for populations that allows for dependent samples (probably because the data are time series and the vectors are correlated), ...
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128 views

How to do randomization check?

I am struggling to find the most effective way to check randomization within my experiment. I have a single factor design with two moderators and two DVs. My IV is type of persuasion (0 direct ...
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154 views

How to use Gpower to calculate sample size for MANOVA?

I try to use the software2 to calculate the needed sample size for a 2 way MANOVA. The experiment is a mixed design, one Independent variable(IV) is between the subject with 3 levels, and the other is ...
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No significance in the multivariate tests

Hope this question is not too stupid. I haven't taken the MANOVA course yet, but I need to figure out a problem right now. I am running a mix-model MANCOVA on SPSS. I have no significance in the ...
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Can you use dichotomous variables in MANOVA?

I have an experimental design with one IV with 5 levels, and a combination of self-report and behavioural outcomes as DVs. The self-report outcomes are all on continuous scales, but many of the ...
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29 views

Some kind of a Manova with repeated measures

I have a question that is somewhere between R and stats I guess... Let's set up the situation: I have a test that gives 4 scores, corresponding to 4 different dimensions of a problem. We can assume ...
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Covariate on a MANOVA mixed-effects model

I have a 2(condition) x 3(group) mixed-design study. I’m interested in the effect of a continuous time-constant covariate (i.e., a unique value for each subject, similar to age) on the interaction (...
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Would a repeated measures MANOVA be appropriate for a 9DV, 2IV within subjects study design?

I am trying to get an estimate of participants to strive for in my study. Being rather new to the research and stats scene, I was hoping the community could help me out a little bit? The study has 9 ...
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63 views

Using and interpreting nested manova in R

I have measured the concentration of 7 elements in 30 Lakes. I have between 8 and 12 observations per Lake (i.e., I measured the ...
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In a One-Way MANOVA, can one of the levels of the IV have a mean of 0 with a standard deviation of 0 on one of the dependent variables?

I realize that this sounds like a very stupid question, but I need to make sure—please stick with me. The project in question is a quantitative content analysis; for the sake of this example, let's ...
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MANOVA statistics and Hotelling T2 for 2 groups

The Wikipedia article for MANOVA (https://en.wikipedia.org/wiki/Multivariate_analysis_of_variance) remarks, regarding the four most common MANOVA statistics (Wilks' lambda, Pillai trace, Lawley-...

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