# manova

1. ### Hotelling's Trace v. Hotelling's T^2- Why make the move?

Hello, I am writing a dissertation and my chair wants me to convert Hotelling's Trace (resulting from my MANOVA) into Hotelling's T^2. No problem to actually do, but what I cannot find in research, and what my chair won't tell me, is why I would do this. The Trace shows the sum of the SSM/SSR...
2. ### MANOVA design

Being rusty, I would be grateful for a quick confirmation of MANOVA being an appropriate model: I have one dependent variable but 6 independent ones: group (3 levels), subjects per group (a variable number, between 11 and 110 subjects) and then the experimental variables: stimulus (3 levels)...
3. ### Multiple MANOVAs - How to adjust post-hoc ANOVA p-values

Hi everyone I have (multiple) dependent variables which I split into two groups. For each group I do a separate MANOVA (one group for metabolism-related genes and one group for immunity-related genes). I assume that if I do post-hoc ANOVAs for each dependent variable (i.e. gene), I will...
4. ### Manova with within-subject and between-subject factors (no repeated measures!)

hello, i need to do a manova with one within-subject factor (veracity) and two between-subject factors (type of speaker and type of presentation). However, it is NO repeated measures design! So how do I tell SPSS what to do? I have only found an option of entering within- and between-subject...
5. ### Manova not significant, some Anova tests are. Are they valid?

I"m doing my dissertation on recommendations made during a diagnostic procedure, so I have 19 dependent variables based on 8 diagnosis levels. When I ran SPSS it was not significant, does that mean that none of the relationships are significant? or could some of the individual Anova tests that...
6. ### ANOVA or MANOVA

Hi, I have a question on which statistical test to use for 2 separate problems: 1) I have 4 different groups, 1A, 1B, 2A and 2C and have 3 different response variables measured at several different times. However I am not interested in the behavior over time and want to treat them as...
7. ### 3x2 design - data analysis ANOVA/MANOVA? How to add interaction in the model?

Hello, Discription of experiment I am researching "The effect of review valence and brand commitment on consumer's purchase intention" for my university thesis. I conducted a 3x2(no review/positive review/negative review x brand/no brand) between subjects design experiment.There were total...
8. ### Statistical test advice, currently thinking a MANOVA test.

Hi, I'm sorry to bother everyone. I am collecting samples (continuous data) from 5 defined sites which can be split into 5 categories (A-E) (1 sample split into 5 equal sections), and will be doing this to gain a minimum of three repeats. The data can be split into 5 different size categories...
9. ### MANOVA, when independent variable is not multi-level and P value significance varies!

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 independent variables are not continuous but they are measured on a 7 item likert scale. And my...
10. ### ITT and per protocol analyses. How to do both and how to compare baseline measures.

Hello, I have read about but cannot find the answer to my queries. I am doing a study looking at the effects of positive thinking (PT) and exercise on depression. I'll be measuring at LEAST 2 outcomes. So far, depression levels and quality of life score levels using standardise inventories...
11. ### Calculating omega squared from spss manova output

I'm trying to calculate omega squared from my output, googling led me to this formula w2=(SSeffect - (dfeffect) (MSerror) / MSerror + SStotal From my output i gather that SSeffect is the sum of squares for my dependent variable, the dfeffect is the degrees of freedom for my dependent...
12. ### Calculating sample size for a two way MANOVA using gpower?

Hi! Just wondering if anyone can help me with this? My normal go to textbook - Quantitative Psychology by Clark-Carter - doesn't cover multivariate stats in great depth and for my project I am planning to do a two way MANOVA. The free Gpower 3 has been recommended to me, but there are no...
13. ### 3 Dependent and 4 Independent Variables...MANOVA?

Hello all, My study recorded 3 continuous dependent variables in relation to an ordinal experimental factor. However, there are 3 categorical bias factors that may have effected the results (some preliminary analysis leads me to believe that only 1 of these had any significant effect). I'm...
14. ### MANOVA / testing multivariatie normality

Hi all, I'm doing an MANOVA with two dependent variables and one fixed factor (three levels). It is said that I need to test for multivariate normality. What is the right way to test for multivariate normality in SPSS? Do I need to test per level or all levels together? best regards Wilbert
15. ### Beginner Question- MANOVA error in R

Hi, I have repeatedly tried to conduct a MANOVA in R but my output keeps returning "no error degrees of freedom". I have three plots each with multiple sample sites, with each sample site sampled 3 times (over 3years). I wish to compare the plots with each but also for differences in each plot...
16. ### MANOVA output- What does this mean?

As I forgot to ask my supervisor yesterday. I have run a MANOVA on two DVs, and in the Multivariate Tests table it says that the main effects of Group and Time are not significant, but that the interaction effect is (Group x Time). I conducted a pre-post intervention study, so I do want...
17. ### Help deciding which statistical test to use in SPSS?

Hi All, I am completing some research and wanted to double check that I am using the correct statistical test to analyse my data in SPSS. I was to look at whether Voting in the community (Categorical response Y/N answer) impacts on the participants feelings that their views are being heard...
18. ### Statistically Challenged Psychology student!!!

Hi everyone, I am really hoping that someone here can help me out. I am really struggling with the analysis for a Psychology study I have conducted, and have lots of questions :( I find stats really difficult, and just cannot begin my analysis yet because I am so stuck. I will try to give some...
19. ### Use of extracted factors from EFA with Mancova in SPSS

For a 2x2 between subjects factorial analysis, I need to test interaction effects of 2 IVs each having 2 levels. The questionnaire has multiple items and I would first like to run FA to reduce DV data and further use it with Mancova. What needs to be achieved: 1. how the extracted data can be...
20. ### Help with statistical analyses with only small sample size and multiple DV's??

I am looking at the relationship between Schizophrenia, Substance Abuse and Neurocognition. I have 30 P's with Schizophrenia and 30 matched-controls (who are matched on age, gender, education level, IQ, and level of substance use), who have been administered a neurocognitive battery of 11...