MANOVA is the acronym for Multivariate Analysis of Variance. This is a generalization of ANOVA for the case where there are multiple dependent variables.

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How can MANOVA report a significant difference when none of the univariate ANOVAs reaches significance?

I would just like to ask if it is normal for the values from my multivariate tests to be significant but for the values from my univariate tests of between-subjects effects table to be insignificant. ...
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25 views

Split-split plot design (with replicates) with repeated measures

I'm looking for references that can guide me with regard to the analysis of a split-split plot design (with replicates) that also has repeated measures over time. Ultimately, I need to be able to: ...
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1answer
95 views

How to do MANCOVA in R?

I have two groups of persons, GRP0 and GRP1, on which I measured three continuous variables: VAR1, VAR2 and VAR3. I would like to use Mancova in R with: - VAR1, VAR2 and VAR3 as outcome variables - ...
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7 views

Compare model performance to distinguish two groups

I would like to compare a sample from the normal population NP to a sample from an "abnormal" population AP. I have several variables measured on both NP and AP, say age, gender, and VAR1, VAR2 and ...
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14 views

How to statistically test if two continuous variables can combined to be proxies of one categorical variable? MANOVA?

In the dataset I have, there's one categorical variable (A) containing multiple levels. Due to multiple reasons, I want to use continuous variables only for modeling. I feel two other continuous ...
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24 views

Likelihood function for MANOVA

I'm trying to get a handle on MANOVA and Repeated Measures ANOVA. My confusion is around what the likelihood function looks like. Here's how I would formulate the likelihood function Notation: The ...
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19 views

MANOVA on long data format

I need to run repeated measures MANOVA on long data format (the format was created to derive a categorical variable that is needed to be used as IV). Running RM MANOVA on long data format using a ...
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57 views

Simplifying explanatory model using Vegan adonis in R

I am a newbie to multivariate statistics, so please forgive me if this question is naïve, or if I have missed something important. I'd like to know whether it would be valid to approach using adonis ...
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46 views

Estimating and comparing pre-post treatment effects in multiple pairs of treatment-vs-control groups

I have a dataset from an experiment where the goal was to study in which plant ecotype a treatment with a certain bacteria had the greatest effect. Hence the data consists of a number of control and ...
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1answer
44 views

MANOVA when sample size is smaller than the number of DVs

I need to compare $16$ quantitative variables, measured for two groups, A and B. I thought of applying MANOVA. However, there are only $4$ and $9$ cases for groups A and B respectively. I looked for ...
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11 views

Multiple binary dependent variables

I want to model multiple binary outcomes with some predictors. Does MANOVA can handle this or is there any other techniques I can use? Thanks !!!
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1answer
77 views

How can MANOVA report a non-significant p-value while LDA results in perfect separation of two groups?

I am new to statistics and currently got a dataset which contains $80$ dependent variables and $1$ independent variable with $2$ groups. MANOVA reports a $p$-value of $> 0.6$ on this dataset. But ...
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111 views

How to best approach ANOVA with multiple response variables that might be correlated and Bonferroni Correction

I need some help verifying a simple analysis. I have completed a simple two factor experiment of more or less equal sample sizes. Let's assume for the case of this question that the sample sizes are ...
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23 views

Do I use ANOVA or MANOVA and why

I have a project for my thesis with both between groups subjects and within groups subjects. The independent variable is the program I am running and the dependent variable consists of 6 different ...
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1answer
48 views

Test(s) For Comparing qPCR results / ΔΔCт values

To be clear, I'm talking about real-time polmerase chain reaction (qPCR), not Principle Component Regression. Though from a company selling qPCR reagents, here is a good walk-through of the ...
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32 views

Pre-Post analysis

I want to compare Pre-Post measures (the event is induces MI in lab rats) for 3 groups (it's always same groups for different pre-post MI measures. At the beginning i was thinking that the appropriate ...
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1answer
69 views

How can I run an analysis of variance with one independent variable and multiple dependent variables?

From my limited statistical knowledge, I could use MANOVA if I had multiple independent variables (x1, x2...xn). What can I do (specifically in R) with one "x" variable and multiple "y" groups? I'm ...
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2answers
119 views

Many dependent variables, few samples: is this an example of “large $p$, small $n$” problem?

"Large $p$, small $n$" typically refers to "many independent variables, few samples". In my case, I have $1$ independent variable, $300$ dependent variables, and $n < 20$ samples. Thus, my case ...
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2answers
64 views

Confidence interval for $\eta^{2}$ for MANOVA in R

I have to report the Confidence Intervals for the $\eta^{2}$ obtained in a MANOVA in R. I use the function etasq of the package heplots to obtain the $\eta^{2}$. ...
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1answer
35 views

How to predict 4 dependent ordinal DV from 6 ordinal/nominal IVs

My question is simple. I got 4 ordinal variables and I wish to investigate the extent that other 6 ordinal/nominal variables predicts their values. I know that ordinal regression is the appropriate ...
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26 views

Follow-on to “Training with the full dataset after cross-validation” - sequential parameter estimation

Background: Here is the background for the question, both the question itself and the answer given by Dikran Marsupial. Training with the full dataset after cross-validation? It asks about after ...
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1answer
41 views

Confused about which variables should be dependent and independent in this MANOVA

I am currently doing research on social media and how it can effect depression, anxiety and stress scale (DASS) scores. I have two age groups (18-25, 26-35) and also took scores on narcissistic ...
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1answer
60 views

R Error in manova(classification ~ ., data) : need multiple responses

I'm trying to get a MANOVA running to get Wilk's Lambda from the summary but I get a constant "need multiple responses" error. Looking at past answers I figured that one of the variables might be ...
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185 views

Significant output in Levene's test for equality of variances in MANOVA; what to do?

I want to perform a MANOVA in SPSS as follows: i have a independent variable that consists of three groups (- of which the group sizes are not equal), and six dependent variables. When checking the ...
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19 views

Non Significant MANOVA but significant OLS regression

I have data which is showing a $p$-value of $0.15$ significance value within a MANOVA (including a significant planned contrast). However, when I dummy code and put it into an OLS regression, the ...
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2answers
266 views

Post-hoc tests for MANOVA

I am using a MANOVA test to compare nine different dependent variables (from neuropsychological and neuropsychiatric assessment) between three groups. The output shows a significant influence from ...
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13 views

Help: Am I using the correct test to detect differences from zero (multivariate ANOVA repeated mesures)

01 August 2014 11:17 Hi, I have 5 measures repeated 3 times under 3 different scenarios (conditions). The measures are survey questions and participants use a visual analogue scale to mark a ...
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1answer
156 views

Two-way MANOVA vs. two-way ANOVA on a composite variable

Is using a 2 way MANOVA to check whether height and weight differ across age groups and gender, the same as using a 2 way ANOVA to check whether BMI (wt in kg/ht in m$^2$) differ across age groups and ...
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3answers
77 views

Significant main effect in one-way, but not in two-way, MANOVA

I used a one-way MANOVA to study the effect of age groups on the average of height and weight and found that they were significant. Then I used a two-way MANOVA to study the effect of age groups and ...
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27 views

Seeking covariates that can negate the effect size of treatment groups in an ANCOVA model

I was going to build an ANCOVA model with two treatment groups (climbed/unclimbed) and a set of 10 potential environmental covariates which may collectively remove the significance of the climbing ...
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45 views

G*Power analysis -sample size calculation

My experiment is devised as follow: There are two different types of stimuli-- cellphones: android (android-1; android-2) and iOS (iOS-1 and iOS-2). A sample size of 60 subjects are divided into two ...
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48 views

SPSS Repeated measures with different pre-post measures

I have the following data: 20 participants, each one going through 2 types of treatments (A & B) at 3 different sessions (times). For each treatment session, i am collecting 6 "normal" ...
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27 views

Weighting, standardize, transforming data before for Multivariate ANCOVA

My question is in regards to data manipulation prior to Multivariate ANCOVA. My research focuses on crustacean eggs. The model involves a covariate and 2 x independent variables and 4 dependent ...
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222 views

MANOVA for mixed model with multiple repeated measurements

I struggle performing a MANOVA for a mixed model. I have the following columns: S - subject (1,...,N) B - in between group (B1, B2) W - repeated measurement - within (W1, W2) M - measured dependent ...
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1answer
55 views

What are the assumptions for MANOVA and how I should apply it in R?

I would like to analyze effect of a treatment on my patient samples by MANOVA in R. I have measurement of 3 different protein level for treated and untreated patients. Now I would like to analyze ...
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1answer
33 views

How to analyze the effect of treatment on a multi-variable dataset?

I would like to analyze effect of a treatment on my patient samples. I have measurement of 3 different protein level for treated and untreated patients. Now I would like to analyze effect of my ...
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1answer
29 views

question on plotting error values for treatment effects from multiple regression output

Say I have some data, where a dependent variable, dv, is a function of some independent variable, iv, and a categorical ...
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81 views

Calculating sample size. Repeated measures within subject

I'm trying to calculate the sample size for a repeated measures within subject experiment. I'm going to test the subjects under 4 conditions and for each condition 6 measurements are taken at ...
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55 views

Significant result in multivariate table?

I have 30 patients and 30 controls and am interested in group differences in an MRI measure. This measure was taken in 5 different anatomical structures, and each structure exists bilaterally (there ...
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40 views

What's more appropriate in the given case: ANOVA or MANOVA?

recently, I had an ongoing discussion about ANOVA versus MANOVA, but yet, I am lacking of arguments for MANOVA. My colleque has tracked data for two times of measurement. It's known that there are ...
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37 views

Choosing correct statistic aproach for dropout analysis

I need some input from you. At the moment, I feel a gap opening between theoretical knowledge and practical implementation. Problem case: In my study, I did an identic training program, around 10 ...
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1answer
26 views

How to compare groups on multiple facets of a outcome and how that outcome relates to a subsequent outcome?

I am interested in comparing levels of insight between a bipolar group and a schizophrenia / schizoaffective group. I am assuming I will have to use "current mood state" as a covariate because it ...
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46 views

MANOVA vs repeated measues ANOVA example

I have the following situation (4 independent treatment groups, each group is tested for 3 dependent variables) and was wondering what would be the best to do: What is the best test to do? I have ...
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84 views

Alternative to MANOVA when group covariance matrices are heterogeneous?

I'm running into problems meeting some of the assumptions of MANOVA, namely homogeneous group covariance matrices and normality. I'm looking for an alternative approach where assumptions are not ...
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1answer
93 views

Should I use ANOVA or MANOVA?

I have data on two groups...I have one independent variable (times 1, 2, and 3) and a dependent variable fitness score (which includes score of a person's heart rate in five stages of the test, ...
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31 views

Identifying formulas from MANOVA in a research paper

I need to identify the formulas for computing the group differences with Bonferroni corrections and Cohen's d effect size in the following paper (chart on the top of page 6): Research Paper What ...
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107 views

Mixed model, repeated measures, nested?, nominal data

I am not sure how to approach the statistical analysis of the following study. Any insights would be greatly appreciated. Thanks! So, I have two independent groups, group A and group B. I am ...
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133 views

Error message with MANOVA

I am having trouble with a MANOVA. I have an experiment with 6 response variable (say, A, B, C, D, E and F), and 3 explanatory variables (say R1, R2 and R3). I used ...
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1answer
89 views

How to perform this ANOVA?

I am interested to know if we have 3 dependent variables, and 2 independent variables, online and face to face, with 2 levels each, as in the example below. The sample size is 30 for each mode of ...
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187 views

Significant box's test equality covariance matrices, How bad it is?

Having equal number of cases across two groups (60 total cases), if one wants to perform a split-plot Anova and finds out that the Box's Test of Equality of Covariance Metrices is less than 0.001 then ...