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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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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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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15 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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86 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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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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123 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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61 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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15 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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23 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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22 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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11 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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38 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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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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29 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
19 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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40 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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46 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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31 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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26 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
21 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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36 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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57 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
77 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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25 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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78 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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61 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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67 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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119 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 ...
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181 views

Does one need to adjust for multiple comparisons when using MANOVA?

There are 10 dependent variables and 2 groups. When I wanted to compare 10 dependent variables between two groups, I performed MANOVA. I wonder if there is a multiple comparison problem in that case. ...
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10 views

MANOVA, when independent variable is not multi-level and P value significance variance [duplicate]

My research has 4 independent variables and 4 dependent variables. My hypotheses are constructed in such a way that 1 independent variable's effect size is checked on 4 dependent variables. My ...
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23 views

how can i use regression model selection technique and to carryout ANOVA for calculated data [duplicate]

how can i use regression model selection technique and to carryout ANOVA for calculated data I have problem regarding to know , what kind of relationship is excised between parameters to produce a ...
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78 views

MANOVA, when independent variable is not multi-level and P value significant in MANOVA but not in ANOVA

My research has 4 independent variables and 5 dependent variables. My hypotheses are constructed in such a way that 1 independent variable's effect size is checked on 5 dependent variables. MANOVA is ...
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1answer
129 views

Does one lose information or precision when calculating effect sizes from statistical values rather than from the raw data?

Let's say that I want to compute the effect size of a certain intervention, for which I have both the raw data and some statistical value that can be transformed to an effect size. For example, if one ...
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118 views

one-way MANOVA effect size interpretation

I'm having problem understanding effect sizes in one-way MANOVA model. In my case, I'm having a 13 variables which I used for clustering and then the produced ...
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650 views

ANOVA shows no significant interaction effect, but Tukey's Test shows significant differences between groups?

I am a PhD student but I am having a hard time understanding certain aspects of statistics. I just ran an ANOVA and I got no significant interaction effect between Density (0 and 20) and Species ...
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36 views

Using MANOVA for classification without separating training and test sets

In this study: Rosenblum, Sara, et al. "Handwriting as an objective tool for Parkinson’s disease diagnosis." Journal of neurology 260.9 (2013): 2357-2361 The researchers attempt to classify ...
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116 views

Which statistical analysis replaces MANOVA when there are too many dependent variables?

I want to understand if an experiment gives equal response at two different levels of an experimental parameter. What I did was to repeat the experiment 6 times at the first level of the parameter and ...
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22 views

MANOVA or repeated-measures ANOVA? [duplicate]

thank you very much for your time! I am currently working on a neuroimaging study comparing lateralization indexes between the two hemispheres in three different groups. I have 4 lateralisation ...
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41 views

Manova Repeated measure?

I am making some marketing research for a new ready to drink product. I want to measure consumers expected quality and experienced quality. Therefore consumers are to answer questions abut the ...
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1answer
87 views

How do I compare two groups by several dependent variables and get 1 p-value as a result?

Suppose I have two groups and several dependant variables. I would like to show statistically whether the two groups are different or not, based on the combination of these dependant variables. The ...
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668 views

How to work out Effect Size for a MANOVA using G*Power

I'm using G*Power to work out how many participants I need. I'll be using a MANOVA, I have two independent variables (Male and Female) and they will be answering 13 different questionnaires so 13 ...
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303 views

How is MANOVA related to LDA?

In several places did I see a claim that MANOVA is like ANOVA plus linear discriminant analysis (LDA), but it was always made in a hand-waving sort of way. I would like to know what exactly it is ...
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Assessing group differences on multiple outcomes

I have one independent variable with two levels: Gender (Male and Female), and dependent variables will be composed of three test scores: Impulsivity, Assertiveness, and Social Desirability. My ...
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54 views

Determining if experiment data can be pooled from multiple experiments

We have a dataset with Time and Treatment as independent variables, and growth volume as a dependent variable. The experiment was repeated on three occasions, with multiple time points and multiple ...
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100 views

Group-Time interaction from MANOVA in R?

I'm practicing MANOVA with R. I have a data (perhaps famous) called 'rat-weight data.' ...
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57 views

Regression or Manova?

I have the following problem: I have one manipulated IV (degree of co-creation) based on three surveys "no" "low" and "high" degrees of co-creation. Furthermore I have 4 DV (Purchase intention, ...
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1answer
702 views

Difference between MANOVA and two-way ANOVA

I have read the articles of both of these statistical methods on wikipedia, and as far as I can tell they are used in the same cases. I could not tell in how far they work the same way, since the ...
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53 views

MANOVA for count data

I'm comparing two groups where each individual was tested on 9 response variables. These variables are a count with an upper limit of 2 (it's a count of missing copies, and max number of copies is 2). ...
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183 views

MANOVA with unequal sample sizes

I have data for 352 response ratings that have been categorized as "Low," "Medium," and "High." I would like to compare the differences of five variables across the three categories to see which ones ...
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32 views

Methodology for finding source of MANCOVA interaction

I am trying to find out the best method for determining the source of a significant MANCOVA interaction. I have 17 traits measured for four locations. Is there an alternate to univariate ANCOVAs ...