Statistical Analysis Stack Exchange
Statistical Analysis Stack Exchange

Questions tagged [mancova]

40 questions
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What is the intuition behind (M)ANCOVA and when/why should one use it?

As per my understanding here's the what/why/when of the following hypotheses tests in a crude sense: t-test: Used when comparing means between two samples ANOVA (one way): Used when you have one dependent variable and one independent (i.e.,…
PhD
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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 - GRP={0,1} as predictor variable - age and gender as…
michael
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Non normally distributed data and comparing correlation

I have data from a research that was conducted by me, the data refer to four conditions made of two levels of time (pretest and post-test) and two levels of group (control and intervention). Shapiro-Wilk test have shown that the data for two of…
Gilad Sabo
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Data analysis for two groups?

I have a data set for two groups i.e. control group and treatment group. They are two different group from the same socio-economic background. But the treatment group has participated in co-management program with the local forest department. Both…
KH. Kabir
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MANCOVA or several ANCOVAS

I am analyzing pre- and post- intervention data for which I have 6 dependent variables for two groups (treatment, no treatment). I want to know if, controlling for pre scores from the 6 measures, post scores differ between the two groups. (Some DVs…
redracer
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Suitability of one-way repeated measures MANOVA

I'm undertaking a research study where I want to look at the difference between the value of a variable before and after an intervention. I've been suggested the one-way repeated measures MANOVA approach. From what I've read about this approach…
Ananya
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Box's M fewer than two nonsingular cell covariance matrices

would appreciate some help with the following problem. While running a MANCOVA i received the following error message from SPSS: " Box's Test of quality of Covariance Matrices is not computed because there are fewer than two nonsingular cell…
Mikhael
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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 multivariate tests, but a significant interaction in…
Jessica
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two-way MANCOVA with two covariates in SPSS

I am running a two-way MANCOVA which needs to be adjusted by two covariates. Problem is, I am not entirely sure whether I clarified all assumptions correctly and how to finally deal with two covariates in combination. I would appreciate if someone…
RSB
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How would you do a moderation analysis?

I'm currently analysing data on an experiment I have run in connection to my BA thesis, but as I'm not that statistically strong, I have run into difficulties and I hope you will be able to help. With this experiment, I test if exposure to green…
Niels
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Anconva or Anova for multifactor analysis

I have non-normal plankton community data, where rows are sites and columns are species (dependent) and a few factors. I want to check the influence of season on community (dis)similarities but am cautious that night and year have an effect. Ideally…
Jim
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What is the best statistical test for this data with multiple predictors?

have a set of data as follows where we measured the change in aluminium or copper according to time, concentration of sediment, temperature and the site the water was taken from. Here is a sample of the data Id Temp Time Site Al Cu Alch …
LucySHE
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Do I need to use a Bonferroni adjustment after a MANCOVA?

My thesis supervisor insisted I do a MANCOVA with 5 dependent variables. However to answer my research questions I need to use the results of the subsequent 5 univariate tests SPSS automatically produces, and the post hoc comparisons for the…
Urszula
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Which statitical modeling in more appropriate when there are several yi? (MANCOVA,Multivariate regression, canonocal correlation)

I have these variables in my data set: a categorical variables with 5 levels (Country) sex a continuous variable (grade) different continuous variables as dependent such as y1,y2,y3,...,y25 (I have 25 columns and each column is one dependent…
Mehrbanoo
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Dependent variable with two dimensions; which statistical test is appropriate?

I do have a dependent variable with two distinct dimensions (factors). In total the dependent variable do have 10 items. The first 5 items belong to dimension 1 (as sub-dimension of the overal dependent variable) and the second 5 items belong to…
Raphael
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