# Tagged Questions

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

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### The use of MANOVA, ANOVA or t-tests for Likert-style data

I have two groups I would like to compare on a series of Likert-style mood dimensions (e.g. Very Sad - Slightly Sad - Neutral - Slightly Happy - Very Happy). The sample sizes are 19 and 63. The data ...
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### Alignment / matching problem with groups

I have two data sets (base and to_match), each with 10 individuals, grouped in 2 classes. Each individual is described by a set ...
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### How is MANOVA a case of the GLM?

It's easy and convenient to teach students the following regression equation $$Y=\beta_0 + \beta_1X_{\text{(continuous)}} + \varepsilon \\ \text{where }\varepsilon\sim\mathcal N(0, \sigma^2)$$ ...
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### regression analysis or MANOVA or..?

We have this data from 5 different treatment groups with a different sample sizes and need some help for analysis. Participants were randomly assigned to a group and were exposed to a certain ...
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### Carry manova with contrasts statements in R [migrated]

how can I implement the equivalent Manova analysis of SAS with contrasts which look like this: contrast 'category1 vs category2' category 1 -1 0 0 in R language ? ...
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### Which analysis do I use for this experimental design?

Seeking feedback from those with a better quantitative mind than my own! Currently preparing my doctoral research proposal. I want to determine the impact that various levels of technology ...
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### Bonferroni correction in MANOVA

so if I've done a MANOVA and followed that up with Bonferroni correction and found that only 2 out of 7 variables are significant (whereas before there were a few more) does that mean that only these ...
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### Repeated measures MANOVA with NO between subjects variable

I'm struggeling with the choice of the proper statistical method for my dissertation in clinical psychology. About my research: - 2 Dependent variables (two different questionnaires; 'dysfunctional ...
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### MANOVA or ANOVA

I have 3 DVs that are correlated, and 2 IVs. I measured the DVs on 2 occasions. There is no control group, just a single group. Should I use repeated measures ANOVA or repeated measures MANOVA to ...
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### Application of repeated measures ANOVA for differentiating pre-treatment and on-therapy groups

I have conducted a clinical trial using three different medications. Three different medications were given to three different groups selected randomly. I have measured a biomedical indice (multiscale ...
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### MANOVA + machine learning

If I fail to reject the null hypothesis of MANOVA at an alpha level of 0.05 in my dataset... am I trying in vain to apply machine learning classifiers and regression algorithms on it? Thanks,
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### Transformations possible when performing a single multivariate ANOVA on a continuous and categorical species database?

I want to study the impact of aquaculture on a hard rocky seafloor community which is naturally low in diversity. 4 replicate images (0.25 m2 each) were taken at fixed distances (0, 20, 40, 80, 120, ...
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### What stat test to use and help with code in R (for a beginner)?

i am just wandering what test to use for the following trial: I have a one treatment at 9 different rates (untreated, 100g, 200g etc) and I want to see how 4 continuous dependent variables and 2 ...
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### What is the best approach to test 2 independent groups on 4 DV's?

So I have 1 IV that consists of 2 categorical groups. Both groups complete the same four tasks, the 4 DV's in my study which are continious. I planned a MANOVA, to see whether the DV's are different ...
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### Nested Manova with random nested factor won't run!

I'm running a multivariate analysis on a nested design with a random factor (Site) nested within a fixed factor (Region), with five dependent morphological variables. I have two sites within each of ...
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### Hypothesis testing for matrices of RVs

I looking for the correct statistical test for comparing matrices of random variables - my IV being a categorical variable and my DVs being n by n matrices of random variables (which are themselves ...
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### Quasi-experiment: sample size & statistics

I am conducting a quasi-experimental research in a school, where I have access to 100 students who are chosen as classrooms and who will be the participants of the study. I am interested in the ...
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### What does it mean if your Mean Squares and F value are very similar?

I am running three separate MANOVAs in SPSS. When I run my tests the results for the tests of Between-Subjects Effects shows that my Mean Square and F are very similar across all the variables I am ...
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### How to compare two sets of time-series 3-Dimensional data?

Let us say we have two data sets. Each of the data sets has velocity $(v_x,v_y,v_z)$ and acceleration $(a_x,a_y,a_z)$ of particles at time steps n where $0 \leq n \leq 100,000$. Now how do I compare ...
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### Is it possible to calculate cohen's d from nonparametric statistics?

I am working on my thesis and my supervisor wanted me to calculate cohen's d for my significant results. I am using SPSS and I was able to calculate Cohen's d using an external site. My independent ...
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### Repeated measures ANOVA or MANOVA (SPSS)

Statistical help needed. I have an experimental design of two independent groups (pregnant/non-pregnant), in which each person has described past memories and future episodes on different variables on ...
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### How to analyze a Semantic Differential?

1) How do we statistically analyze data from a semantic differential? I have seen the results rendered as a graphic joining each point as such
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### Looking for the best data analysis

I am currently in my dissertation phase and I am stumped on what data analysis I should be using. I am looking to evaluate resilience differences in genders. I'm using a non-experimental, causal ...
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### experimental research design

In an experiment, same group of participants are required to test (low and high) visual quality of a user interface. The goal is to find whether perception of usability is affected by any of the low ...
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### Comparing two groups with different size on multiple continuous variables [duplicate]

I want to compare two groups on 9 continuous variables to see whether mean scores on these variables differ between the two groups. However, my samples have a very different size: one group includes ...
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### Planned Contrast after MANOVA and RM ANOVA

Im not sure I will get much help on this but this is a last resort. DESIGN I have 2 Independent Variables: 1) Group (Experimental and Control) 2) Time (Baseline, Post-Intervention, Follow-up) I have ...
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### DFA in SPSS: Sorts effectively, but Box's M is still 0.000. Is the analysis worthless?

I am a geologist attempting to apply the discriminant function analysis to surface features I have mapped in ArcGIS. At the moment I have 4 dimensionless sorting variables calculated for each feature, ...
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### Can longitudinal studies ever be treated as having independent observations?

This may be a dumb questions, but for sake of statistical analyses I'm wondering if the data of a longitudinal study can ever pass the assumption of having independent observations? For example, I am ...
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### How to interpret P-value from mixed model and P-value from overall ANOVA?

I fitted mixed effect model with several effects with lme package in R by command ...
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### Research Design Strategy

The total number of participants in a study is 70. This sample is divided into two groups. Group A (35 participants) and Group B (35 participants). The purpose of the study is to investigate the ...
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### T-tests, manova or logistic regression - how to compare two groups?

I'd like to check whether women and men differ on those five variables, that can be correlated with each other. The groups are also not equal with 589 females and 293 males. The solutions that come ...
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### Proper regression method for multiple continuous independent and a single continuous dependent variable?

I have 3 continuous (actually ordinal) independent variables and a single continuous dependent variable. I'm trying to sort out which regression method I should use in this case. MANOVA appears to ...
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### Kruskal Wallis or Manova

I have to analyse 8 independent variables (IV) toward 8 dependent variables (DV) in my research. The IV is nominal while DV are ordinal (likert-scale). I run the normality test and the result is zero ...
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### Statistical analysis of groups with reversed treatments and control groups

I have a quasi experimental study with three groups of students. One group received no treatment, only pre and post test observations on two units of instruction. Another group received treatment A ...
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### The same participants completed survey three times, how many cases do I have?

I have total 22 participants in my treatment group, I have three DVs, and I asked my participants fill out the survey three times (beginning, middle, and the end) throughout of the treatment. I want ...
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### How to determine trend in Achievements before and after an event?

I have the following data-set for a lot of persons (only 1 person being shown here) Actually the dataset has 4 levels, each level being a roll up of the original dataset A <- being rolled at a ...
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### Why do the results of a MANOVA change when the order of the predictor variables is changed?

So, for example, using the Iris data and treating iris species as the predictor variable and sepal length, sepal width, petal length, and petal width as the dependent variables we get MANOVA output ...
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### MANOVA or Mixed ANOVA? Several measures as dependent

I am trying to analyse data of 2 different groups (control vs experimental, brain damage) and their performance on 3 different cognitive tests (the results of which are not correlated) to determine ...
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### Correct way to perform a one-way within subjects MANOVA in R

Note: This question is heavy on R programming, but it was recommended that I post it here after I posted an almost identical question in StackOverflow Main Question I'm looking for help correctly ...
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### Nonparametric MANOVA for paired samples

I have a Test group(~ 20 subjects) and Control group (~ 20 subjects) on whom 10 sets of measurements (10 Dependent variables - DV's) exist before treatment. Post treatment (on the Test group) the 10 ...
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### Is MANOVA the correct analysis for this case?

During an experiment I presented participants with some sound stimuli and I asked them to modify two parameters of the sound (Centroid and Sound_Level_Peak) to reach a given experimental goal. The ...
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### Complex Factorial Manova in R/SPSS

Hello I have been struggling for many days with this problem. The situation and data set are following. The data set comes from an experiment that asked subjects (ID) to compare several CVs on ...
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### F.model doesn't make sense to me in adonis, vegan package

I am having some trouble with adonis (vegan), and I don't think it's my data that is causing my head to go around. I ran the example code on the help page, which uses the dune data set. ...
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### Two sets of % figures - which test to use?

I have two sets of data, and would like to know which test to use to best analyse. I have 28 records (each is a country) - For each record I have two categories (each comprised of three variables): ...
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### showing the estimator of $\sigma^2$ [closed]

Let's take a one way ANOVA Model as $Y_{ij}=\mu + \tau_i +\epsilon_{ij}$ $i=1,2,3$ and $j=1,...,n_i$ and $\epsilon_{ij} \sim N(0,\sigma^2), \ \ \ \forall (i,j).$ Sample variance for factor ...
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### RM-ANOVA alternatives for non parametric data

I have the following experimental design. 1 treatment with 2 levels ("UT" and "TR") 20 animals per treatment level 30 time measurements from p1 to p30 Details: p1 and p2 are stimulation periods ...
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### Negative Pseudo-F value in Permanova / NPMANOVA?

I am using PAST v3.09 for Permutational / nonparametric Multivariate ANOVA. I am getting negative Pseudo-F value for the interaction and I was wondering if someone could help me understand what a ...
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### ANOVA of d' (d prime) and the potential issues therein

Repeated measures ANOVAs of d' (d prime, or sensitivity) are common in a wide range of literatures. This being said, d' is distributed roughly exponentially, and therefore violates the assumption of ...