Stack Overflow
Stack Overflow

Questions tagged [manova]

The Multivariate analysis of variance (MANOVA) is a statistical test procedure for comparing multivariate (population) means of several groups.

Multivariate analysis of variance (MANOVA) is a statistical test procedure for comparing multivariate (population) means of several groups. Unlike ANOVA, it uses the variance-covariance between variables in testing the statistical significance of the mean differences.

Details: http://en.wikipedia.org/wiki/Multivariate_analysis_of_variance

91 questions
1
vote
0 answers

Create covariance-matrix that mauchly's test has been violated

How to create a covariance matrix by eigen-values, so that mauchly's test indicates to reject the null hypothesis. Is there a pattern of a covariance-matrix for a experimental design which produces r.v., so that the assumption of sphericity has been…
Klaus
  • 1,946
  • 3
  • 19
  • 34
0
votes
0 answers

ANOVA in science social

I want to know if I can applied the test of ANOVA in my data: the items are scaled from 1 to 4, the Dimension is the sum of the items, the last variable is the region. I want to applied the test anova to see if there is an impact of region on the…
John
  • 1
  • 1
0
votes
0 answers

Does PERMANOVA analysis (specifically adonis2 in the vegan package) allow for nested terms?

I am trying to run a PERMANOVA analysis on the bray-cutis dissimilarities between my samples, but I need to nest sample days within time of day. I read that the "strata" function in adonis2 constricts the permutations, but I can't get this code to…
Ayda L
  • 1
0
votes
0 answers

MANOVA after multiple imputation (mice) in R

I've used the mice package to impute missing data (created 30 imputed datasets) and I want to do a manova and pool te results. I can't seem to find any code or examples on how to do this, only on regular anova. Can anyone help me? Thanks!
Laura
  • 1
0
votes
0 answers

How to adjust MANOVA code in SPSS to using a continuous covariate?

I use this code (inspired by the Andy Fields SPSS book) to obtain contrasts for Interaction effects (e.g., Time X Group in an intervention) in repeated measures (M)ANOVA in SPSS. Now for my current project I need to add a covariate into the…
Ninke
  • 247
  • 1
  • 12
0
votes
0 answers

Post-Hoc tests for MANCOVA

:) I am quite new here so I hope I can present my problem in an understandable way: I conducted the following MANCOVA and received the output that there is a significant effect on the Independent variable as well as on a covariate (attached the…
Raya Küssner
  • 1
0
votes
0 answers

Which type of statistical analysis to run in R with 2 treatment types in my study?

Screenshot of Data I have a seed germination study that I am trying to analyze. In this study I had 4 different media types (nutritious agar plus different vitamins/additives) with 40 plates each. Each group of 40 plates was split into 5 groups of 8…
midwestbotanist
  • 1
  • 1
0
votes
0 answers

can I feed a test statistic to the MANOVA test in R? (or are my statistics already implemented?)

In a publication from Juergen Cox and Matthias Mann (2012) there are test statistics stated for the manova test. However, with the manova() test in R I get different results than i get with their software. Are the test statistics (included as images…
McP
  • 1
  • 2
0
votes
0 answers

PERMANOVA - small and unequal sample sizes

I am comparing fish communities at 2 sites (upstream vs downstream) with data collected in two seasons (wet and dry) over several years (2017-2022), with data from the first pair of wet and dry seasons representing the period before a treatment and…
Reason
  • 15
  • 3
0
votes
0 answers

permanova/anosim test microbial community composition

I am trying to run a multivariate analysis of variance test on a small set of microbial community samples. I have tried using anosim, manova, as well as the adonis functions from the vegan package and I keep coming up against similar errors of…
Heather Hirsch
  • 1
0
votes
0 answers

Emmeans package clarification

I have been looking at forming adjusted means for a value in a ancova regression. I have quite a simple question: when using emmeans does it provide the adjusted means over mutiple coavariates. For instance: model<- aov(Score ~ categoryA+B+C+D,…
DW1310
  • 147
  • 7
0
votes
0 answers

How to get adjusted means following multiple imputation?

I am trying to find the adjusted means for values following multiple imputation using the mice package for a ANCOVA model (zScorePALAdj~Grouping+age+sex+education_years). I have had to impute some missing values for a model, and then used the…
DW1310
  • 147
  • 7
0
votes
1 answer

Unexpected output table for permanova (adonis2 in r) to test for interaction

I am rusty with my stats knowledge, please correct me if I use the wrong terminology or misunderstand anything. I am using adonis to perform a permanova test with the script: nmds.div<- adonis2(nmds.dist ~ Season*Area, data = Type0, permutations =…
locopoko
  • 5
  • 2
0
votes
0 answers

Anova for multiple subgroups

To compare two models using anova in R, I can simply use anova(model1,model2) and conclude whether they are significantly different or not based on the p-value returned. However, currently I have data such that: Cities Localities x1 x2 …
zaira
  • 153
  • 1
  • 7
0
votes
0 answers

How do I compute in R a rm MANOVA with three types of SEN as a within factor and two dimensions as dependent measures?

I want to compute a repeated measures MANOVA with type of special educational needs for three groups as a within subject factor and two dimensions called warmth and competence as dependent measures in order to see whether the warmth and competence…
Charlotte Sophie
  • 1
  • 1
1 2 3
4
5 6