Questions tagged [manova]

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

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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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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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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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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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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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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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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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between subject, within subject with a covariate

I hope some of you experts can help me figure out if I am doing the right analysis for my study. Basically I have a mixed- design study. This is composed of a between-subject IV (2 groups: treatment ...
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conceptual model and mixed anova

I am doing a research about the influence of a food label on Perceived Healthfulness of a product. My independent variable is Label (absent/present) and my dependent variabel is Perceived ...
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Box's M Significant and One variable in Leven's test failed for quality of variance SPSS

I am doing a MANOVA test as part of a psycology project and have to use MANOVA Box's M gives a sign value of less than 0.05 (stated to be used on imb's website) but greater than 0.001 (stated to be ...
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What's the best function to test multivariate normality when sample size more than 3000?

Before MANOVA, I need to test multivariate normality. Then I tried MVN::mvn() function in R, output as below: ...
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Repeated Measures ANOVA or MANOVA

I am studying the effects on an intervention on one group of individuals two times, before and after intervention. I am measuring social skills using a rating scale. The rating scale has an overall ...
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Wilks.test usage in R

I want to calculate the Wilks' lambda for a given data set. The "rrcov" library in R appears to have a function for this purpose. The examples provided in the documentation run without a problem; ...
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As to unbalanced design sample data,do we need to check variance homogeneity as precondition of two way anova?

For the balanced design data,I know variance homogeneity among each cell is the requirement of two way anova. As to unbalanced design data,do we need to check the variance homogeneity of each cell? If ...
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Can we use `two way anova` when factors have interaction?

You should have independence of observations, which means that there is no relationship between the observations in each group or between the groups themselves. Above sentence come from https://...
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Comparing the before and after scores between two groups

In this experiment I'm trying to make, one group of people watches a lecture series and one does not. Before the lecture series, both groups' levels of optimism, knowledge, and anxiety are assessed. ...
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Test differences among classes (factor levels) on multivariate response, when there are ~800 factor levels

I am performing an unsupervised classification based on several environmental variables (dataset X). I want to test whether the resulting classes (~ 800) present differences in soil properties (...
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Set of Social Values of different Samples: ANOVA?

I have been collecting data for 10 consecutive years. One survey each year, different subjects (samples between 105 and 120), Likert scale 1-5 for each of 30 social values. What is the most ...
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2 groups, 4 repeated measures, dependent variable has 4 categories that add up to 100. What test should I use?

We conducted an experiment in which we had two independent groups of people that received different interventions. We tested each group before the intervention (pre-test), after the intervention (post-...
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How does SPSS calculate composite variable for MANOVA/Multivariate multiple regression?

I have analysed my data using multivariate multiple regression (8 IVs, 3 DVs), and significant composite results have been found. Before reporting my findings, I want to discuss in my results chapter ...
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How can I analyse several ordinal dependent variables across multiple time points?

So, I have several ordinal scales that have been administered to the same sample at three different time points and each is being treated as separate dependent variable. I can't run a repeated ...
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Two way or One way repeated measures Anova

I want to examine the effect of gender on running conditions. There are 4 running conditions including baseline and i want to see if there is a significant difference between genders across these ...
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One way MANOVA or Two way MANOVA

I have done statistics many times at Uni at both Undergraduate and Postgraduate levels but as they say “if you don’t use it, you lose it” and that is certainly the case. I am trying to assist my ...
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Estimating a single drug effect in a sample of patients: each patient assumes multiple drugs. Is this possible?

So here is my scenario: Patient A takes drugs 1 - 2 - 3 Patient B takes drugs 2 - 3 - 4 Patient C takes drugs 1 - 2- 4 and so on ... Each patient gets his symptom severity measured two times: first ...
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Is it possible to incorporate a dummy DV in MANOVA?

I have six dependent variables in an 2x2 between subjects experimental study. I would like to analyze the results using a MANOVA, in order to control for the type 1 error. However, one of my DVs is a ...
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Can a MANOVA be run with dependent variables of different units?

I want to determine if there is a statistically significant difference in the vector of means between two independent groups. Specifically, my between subjects factor is sex (i.e., male, female) and I ...
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RM Manova follow up - Unvariate or discriminant analysis?

I have a one-way repeated measures manova with participants measured on 2 DV's (both aspects of language quality) and one within subjects IV (condition). Participants were all tested over 4 conditions....
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Repeated Measures MANOVA Planned Comparisons & Profile Analysis

I'm conducting a repeated measures MANOVA with one IV (4 conditions) and 2 DV's. My participants have taken each condition. Assuming the MANOVA and univariate tests are significant, I would like to ...
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What statistical test (using R) can reveal relationships between 5 factors in randomized block design?

I'm at a loss as to how I can efficiently obtain p-values in R for the relationships I am interested in exploring in my dataset. Here is a picture summarizing the block design. Various response ...
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MANOVA, linear regression or Chi-square?

We have a dataset we're trying to figure out what the best way to analyze is. The datset looks like this: Group (A/B) Sex (M/F) Race (x) Response (strong, weak, none) Any thoughts? looking at it, ...
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What is Pillai's trace actually telling me?

I've read the site, the MANOVA section in a stats for n00bs book and Googled but I can't find this answer. I believe I'm conducting a one-way MANOVA. I have one IV which consists of two groups. I ...

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