Questions tagged [manova]
Multivariate ANalysis Of VAriance (MANOVA) is a generalization of ANOVA for the case with several dependent variables.
432 questions
1
vote
0
answers
66
views
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....
1
vote
0
answers
44
views
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 ...
- 11
2
votes
1
answer
344
views
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:
...
- 10.2k
2
votes
1
answer
3k
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 ...
- 21
1
vote
0
answers
134
views
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 ...
- 11
1
vote
1
answer
333
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 ...
- 21
1
vote
0
answers
70
views
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 ...
- 11
1
vote
1
answer
710
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 ...
- 351
0
votes
1
answer
1k
views
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:
...
- 294
1
vote
1
answer
608
views
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; ...
- 113
0
votes
1
answer
177
views
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 ...
- 294
1
vote
1
answer
670
views
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://...
- 294
0
votes
0
answers
1k
views
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. ...
- 1
0
votes
0
answers
37
views
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 ...
- 21
0
votes
1
answer
259
views
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 ...
- 53
0
votes
1
answer
823
views
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 ...
- 1
1
vote
1
answer
28
views
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 ...
- 11
0
votes
1
answer
749
views
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 ...
0
votes
0
answers
58
views
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 ...
- 1
2
votes
0
answers
887
views
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 ...
- 21
0
votes
0
answers
37
views
Determine DVs (dependent variable), IVs, and test objectives
I'm doing a practice problem which goes something like this. It is homework-style but not exactly. I'm doing some practice problems myself.
Envato is a loyalty solutions which rewards their customer ...
- 1
9
votes
1
answer
3k
views
The way PERMANOVA handling continuous explanatory variable
I have read some tutorials which explain the mechanism behind PERMANOVA, e.g., enter link description here. Based on the tutorials, my understanding is PERMANOVA can only handle categorical ...
- 121
0
votes
1
answer
253
views
Statistical analysis of amino acid profiles, quantitative vs qualitative methods?
I work on a study comparing the amino acid profile of 5 sample groups with 3 replicates in each group. This is how the data looks like except that there are 17 columns (one for each amino acid) in ...
- 165
9
votes
1
answer
2k
views
Is it okay to perform PerMANOVA on PCA values?
Is it acceptable to first perform principal components analysis on a dataset, and then use permutational MANOVA on those principal components values, rather than on the original values in the dataset? ...
- 91
1
vote
1
answer
447
views
MANOVA contrast results p-value in SPSS - Bonferroni correction required?
I am running a MANOVA with 2 IVs(2*3) and 4 DVs. I want to test the effect of the 3-level IV using a Helmert contrast: to compare if level 1 significantly differs from the mean of levels 2 and 3, as ...
- 125
1
vote
1
answer
442
views
Deciding to use an ANOVA model with interactions or testing significance without interaction
I know this is a widely discussed topic and there are numerous sources and examples. However, most of the statistical jargon goes over my head. I was hoping that someone could simply explain my ...
- 143
1
vote
0
answers
602
views
How to perform Repeated Measures MANOVA, with unbalanced design [closed]
I am analysing data from a vaccination study and I think that the best way to model my data is with a repeated measures multivariate ANOVA. Because I have different #'s of subjects in each study ...
- 11
1
vote
0
answers
28
views
Whither multivariate regression?
I've been handed someone else's data (again). It's measurements of six proteins' levels from 20 human brain samples, 5 each of different stages of a disorder. I'd like to run a multivariate regression,...
- 1,291
2
votes
2
answers
3k
views
Mixed Model using lme4 in R for multiple response data
I have some questions about how to translate my data structure and research Qs to syntax for the lmer function (lme4 package).
I am looking to predict teenagers scores on a mental health questionnaire ...
- 88
0
votes
2
answers
1k
views
Insignificant two-way MANOVA results - what do I do next?
I am very very new to stats. I decided to try and do a MANOVA in SPSS, my between-subjects IV is gender and my within-subjects IV is the two conditions in which all participants took part. My DV is ...
2
votes
1
answer
56
views
How to quantify measurement error
I would like to determine the measurement inaccuracy one of our laboratory machines in different conditions:
Let's say for simplicity's sake it is a b/w digital camera with 1024x768 pixels (786,432px)...
- 213
1
vote
2
answers
16k
views
Is there a non-parametric alternative to Two-Way Repeated Measures Anova?
I am currently comparing the EEG funcional connectivity measured at 14 electrodes and 4 frequency bands between highly and lowly hypnotic susceptible individuals. I extracted the coherence and the ...
- 11
1
vote
1
answer
355
views
Stratify the analysis if Levene's test fails
I have a question about the correctness of a statistical analysis.
I have a variable called L, which is the log of the number of bacteria present in some foods. L is a function of the treatment T (...
- 53
0
votes
1
answer
11
views
What stat analises to use? In SPSS
What analises to use? MANOVA? And how?
I have a following design:
Two groups made the same task and the result I have in Reaction times ( dependent variable). I have three additional variables (...
- 1
1
vote
1
answer
2k
views
In VEGAN ADONIS, what does "method='bray' do when I pass in a distance matrix I already have (UNIFRAC)?
Suppose I have a distance matrix created by applying the weighted unifrac measure. For instance, using a phyloseq object:
...
- 1,158
1
vote
1
answer
2k
views
Are my PCA groups significantly different?
I am studying the feeding behaviour of deep sea fishes, and have produced a dataset containing percentages for 20 different fatty acids (totalling 100%) for 32 individual fish. I have performed PCA (...
0
votes
0
answers
20
views
What statistical method should I use to quantify a tests ability to separate by category?
Say I have the table of results below. In Test 1 categories a, b, and c produce results which are clearly distinct. In Test 2 the categories produce some separation, though not entirely. Test 3 ...
2
votes
1
answer
415
views
Do I need to correct for p-value when doing repeated ANOVA test?
We are investigating the relationship between smoking status and the hormone level. Smoking status is X(three-level) and the level of the hormones is Y(continuous variable). However, the smoking ...
- 709
2
votes
0
answers
137
views
Why does adding a dependent variable to a MANOVA remove significance?
We designed an experiment with 2 discrete independent variables (IV), 1 (measured) confounding variable, and 2 dependent variables (DV). We hypothesize that the two IVs interact on both DVs.
Right ...
- 470
1
vote
0
answers
106
views
Does ordinal logistic regression substitute for "multifactorial Friedman test"?
I'm searching for an appropriate statistical test, more or less a multifactorial version of Friedman test. But I'm also wondering if Wilcoxons rank sum test can do the job.
Experimental design:
10 ...
- 11
1
vote
2
answers
116
views
A is correlated with B/ A has an impact on B
I've been reading papers to collect materials for my bachelor thesis,
and I came across this question and wasn't sure if my understanding of the concept is correct.
Is "A is correlated with B" the ...
- 13
1
vote
1
answer
2k
views
How to perform MANOVA with categorical independent variables
I have a dataset where the independent variable is sieve size (categorically either 25, 63, 100 or 150), and the dependent variables are length and width.
...
- 111
1
vote
0
answers
31
views
Question on interpretation of covariates in repeated measures analysis [closed]
I am currently having difficulties with the statistical analysis of my research. My research is the effect of a drug on 3 measures, upper limb impairment and 2 qualtiy of life measures at two time ...
- 11
0
votes
1
answer
999
views
UPDATED: Multiple lme models or MANOVA with random effects? Problem with singular fit
hope you can help me with this issue!
In my study I have 4 outcome variables which correspond to the ratings I collected for 4 different psychological dimensions (liking, comfort, approach, ...
- 35
0
votes
1
answer
178
views
Why analysis of variance should I use for my clinical trial proposal?
I have 2 independent variabiles(2 treatment groups) and 2 outcomes, measured at 3 time points. Is manova the analysis I should use?
- 15
1
vote
0
answers
19
views
An Interesting Model with Unknown Orthogonal Design Matrix
Consider a linear mixed model,
$$\mathbf{y}_{ij}=\mathbf{\Gamma}\mathbf{\mu}+\mathbf{z}_i+\mathbf{e}_{ij}, ~~ ~~i=1,\ldots,m,~~j=1,\ldots,n_i,
$$
where $\mathbf{y}_{ij}$ are $k\times 1$ observation ...
- 21
0
votes
1
answer
274
views
Do ANOVA & MANOVA require balanced levels?
I have one independent variable with two levels, or categories, and four dependent variables.
When doing a MANOVA or ANOVA test, how important is it for the number of observations in each category to ...
- 355
0
votes
0
answers
157
views
PCA plot does not show a statistical difference even though the single factor MANOVA was used
My single factor MANOVA showed that there is a statistical difference between the red and black (which represent the effect of treatment given) : the P value was <0.05. But in PCA there seems to ...
- 1
0
votes
1
answer
2k
views
two-way MANCOVA
I am currently trying to run a two way MANCOVA as I have to independent variables with 2 levels each 1) sleep chronotype (late and early) and weekly sleep loss (high and low). I have four dependent ...
0
votes
0
answers
31
views
What type of test do I use in G Power?
I've got 1 IV with 2 levels (within-subjects) and 4 VD's (with 7 levels).
What type of test do I use in this case ?
Thank you
- 1