0
votes
0answers
8 views

3x2 design - data analysis ANOVA/MANOVA? How to add interaction in the model?

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 ...
-3
votes
0answers
48 views

NEED ANOVA HELP ASAP!

I have been looking at my stats results for 4 days now and I cannot figure out how to interpret the results. I conducted a within subjects experiment in which participants rated 4 neutral symbols on ...
4
votes
1answer
49 views

Using Univariate ANOVA with non-normally distributed data

If my data are non-normally distributed and I'm conducting a 2x2 ANOVA, what can I do to correct for this problem so I can report the main effect and interaction output appropriately? Only one ...
0
votes
0answers
32 views

repeated measures ANOVA with covariate

I conducted a repeated measures ANOVA and added a continuous covariate. Now there is a significant main effect of that continuous covariate. If I report that main effect I need to say something about ...
0
votes
0answers
29 views

Calculate residual after SPSS runs ANOVA

I have a task something like compute residuals in dollars for one observed person (with gender code, a class they're in, their age, and they make let's say 50,000 a year-the Dependent Var). After ...
3
votes
2answers
105 views

Is a repeated measures ANOVA appropriate for multiple within-subject measurements?

I recorded 4 groups of captive birds (each group a difference species) at the same 3 times each day for 15 days. I want to determine if there is a difference in their vocalization properties such as ...
1
vote
1answer
29 views

Comparing 8 categories (degree) against % who did a gap year within that degree - which test?

Want to see if there is a statistically significant difference between the % of students who did a gap year across 8 different degrees. $$ \begin{array}{l|r} \text{Degree} & \text{Gap } [\%] ...
1
vote
1answer
93 views

What is the correct ANOVA for repeated measures with multiple measurements for each within-subject factor?

In Andy Field's example for one-way ANOVA with repeated measures, he measures "retching time" for eight different celebrities eating four different gross foods. He tests things like sphericity, runs ...
0
votes
0answers
21 views

Repeating ANOVA analysis after dropping one factor: different means

I had to repeat the analyses after dropping out one of the between-subject factors (order of the questionnaires) and the new means I got for other effects were different from those I had before. Can ...
1
vote
0answers
17 views

Repeated measures ANOVA with unbalanced data [duplicate]

I am a master's student, and I need your help. I did experiment on one group of rats, the group was tested during 8 days, this is the first stage. The same group was also tested again but this time ...
0
votes
0answers
29 views

ANOVA repeated measurements

I am a master's student, and I need your help. I did experiment on one group of rats, the group was tested during 8 days, this is the first stage. The same group was also tested again but this time ...
0
votes
0answers
74 views

Mixed Model t Test (Toothaker’s t-Test)

I'm trying to do a follow up test for a mixed model ANOVA, and I figured that I need do a Mixed Model t test also known as Toothaker's test. I just don't know how do it. I was wondering if anyone has ...
0
votes
0answers
70 views

Mixed Model ANOVA interpretation

I am using SPSS to analyse the 3-way mixed model ANOVA of my study. I have split my variables down to interpret simple interaction effects and found that whilst the graph displays an interaction ...
3
votes
1answer
224 views

Post-hoc test in two-way ANOVA

I am doing a two-way independent ANOVA using type of organisational change (5 levels) and job level (7 levels) within the organisation as the factors (in SPSS). I followed Andy Field's procedure ...
0
votes
0answers
141 views

Customizing a Split-Plot Model in SPSS

I am having a little trouble with SPSS in a rather complex design. I have to analyze an experiment with 1 within factor and 3 between factors. I don't want to test all possible effects (just the 4 ...
0
votes
0answers
143 views

Advantage of using ANOVA over a kruskal wallis test

This question is a follow on from this question - Correlation with non-normal distribution. An ANOVA explanation was given here - Correlation between vegetation and erosion - that could be applicable ...
0
votes
0answers
30 views

How do I figure out how many points I need for their to be significance between 2 independent samples mean scores?

I have 2 products tested by totally separate samples. Product 101 was tested by 160 people and product 201 was tested by a different set of 120 people. People were asked how much they like the ...
1
vote
0answers
75 views

In SPSS two factor ANOVA, how to compare control groups across other factors?

I have two factors: Brainregion (4 levels) and Group (5 levels). Glutamate is my dependent variable. I am running General Linear Models in SPSS (two factor ANOVA). Can I get the output in such a ...
0
votes
2answers
366 views

Unequal Sample Sizes for Two-way Repeated Measures

I have 3 different treatments with the observations of 6 different repetitions. However, all these different treatments (groups) have different numbers of patients. The first group has 26 patients, ...
0
votes
0answers
295 views

How do I check for normality prior to using a Mixed Anova?

I have just conducted an experiment in which I have measured glucose concentration in patients (4 different treatment groups) at 3 different weeks ( pre, 6 weeks and 12 weeks). I want to use Mixed ...
1
vote
1answer
36 views

Compare mean effect of one predictor based on another predictor

I would like to compare the effect of one IV ("sensation seeking") on a DV ("intended infidelity") based on another IV ("gender"). Actually I really just want to compare the means. So I would like to ...
1
vote
2answers
747 views

How can you implement a two-way ANOVA with nesting in R or SPSS?

I currently am conducting a study where I have three variables: one that is binary, and two numerical ratio variables. Each of the subjects in my study has values for each of the three variables. ...
0
votes
0answers
105 views

Nonparametric statistical test for analyzing 2*3 between-subject design's main & interaction effect

I am now having trouble analyzing my data since I got stuck on selecting the proper statistical test to use. My data is a 2$\times$3 between-subject design data. The two IVs are one norminal(with ...
2
votes
1answer
1k views

How to test the effect of pre-post, treatment-control intervention with three age groups, two dependent variables and gender effects?

The hypothesis of my research project is “a certain training improves the ability in Subject A” . Sample details Groups: 1A (25), 1B (21), 2A (25), 2B(27), 3A(23), 3B (23). The number within ...
0
votes
0answers
81 views

Post-Hoc for 2x6 Mixed Design ANOVA

I have run a 2 (gender) x 6 (A) mixed design ANOVA. While I found a main effect for A, the interaction was also significant. While attempting to run post-hoc through SPSS, it said that I was unable to ...
2
votes
1answer
164 views

Repeated Measures ANOVA with several measures entered together: how to find main effect

I've run a 2 (treatment and no treatment) x 2 testing occasions (pre and post) Repeated Measures ANOVA. In addition, I entered several tests given at both time points, so under the Repeated Measures ...
1
vote
3answers
1k views

Interpret significant interaction but no main effect in repeated measures ANOVA

I have a model in which two groups are measured on one DV at pre- post- and 3 months following an intervention (the control group did not receive the intervention). I have an interaction effect, which ...
1
vote
1answer
117 views

Data analysis using matched design - SPSS help

I would love to get some advice regarding the following please! I am involved in a study that is looking at cognition across 3 separate groups (1= the clinical group of interest; 2= clinical control ...
1
vote
1answer
143 views

Interpreting multivariate tests in repeated measures

I have a within subjects design with 4 DVs and I ran a repeated measures analysis on SPSS. My DV is a physiological measurement and is not expected to be linear. My multivariate Wilks lambda is ...
1
vote
1answer
441 views

Replicate ANOVA with linear mixed model in SPSS

I am trying to replicate a mixed ANOVA using a mixed model, but the mixed model is giving me different results. I'd like to know why, and how to get them to give the same results, assuming this is ...
3
votes
3answers
2k views

Choice between Type-I, Type-II, or Type-III ANOVA

We have a dataset with three variables (dV: self-reported measure on scale 1-5, assumed to be metric; iV1: factor with 4 levels; iV2: factor with 8 levels). We are interested whether the dV differs in ...
1
vote
1answer
164 views

Two-way ANOVA, what to do next?

I used a 3x2 between-subject ANOVA to examine the effect of colour (three levels: colourless, light red, and dark red) and odour (odourless or not) on perceived sweetness. The results indicated ...
0
votes
1answer
569 views

What does it mean to have negative values for both lower and upper bounds on a 95% Confidence Interval on ANOVA?

My data shows 95% CI = [-1.07, -0.40], what does the negative sign indicate and how do I interpret the data? as I think it is significant for not capturing the value of 0.
1
vote
1answer
674 views

ANOVA result indicated that there were sig. differences while Tukey post-hoc test revealed that there were no statistically sig. differences [duplicate]

I was conducted one-way ANOVA analysis to examone the level of knowledge shaorng among the employees based on there age differences. One-way ANOVA indicated that there were significant differences in ...
2
votes
2answers
307 views

Help with Anova of categorical and continuous variable in R and SPSS output

I am having some trouble running an Anova on categorical variables in R and matching SPSS output. What I need to do is run an anova on the dataset below (its a made up data set). But, I need to know ...
2
votes
1answer
131 views

How can I perform post-hoc tests to the ANOVA performed during K means clustering?

If I have highly dimensional data and perform k means clustering, I can end up with clusters that differ more on some axes than others. SPSS provides the option to return an ANOVA for each variable, ...
4
votes
2answers
258 views

R p-value half to SPSS rANOVA

I have done rANOVA in SPSS and then in R and got two different p-values from the same model. While SPSS gives 0.032, R gives 0.0162, which when rounded is a half. Other data are exactly the same. 1. ...
4
votes
1answer
328 views

Why is ANOVA interaction no longer significant after including a covariate?

I have initially run a 2x2x2 Anova and found some significant interaction between the independent variables. I then ran a ANCOVA where I added a covariate. I am confused with how to interpret the ...
1
vote
1answer
651 views

Repeated measures ANOVA: Mauchly's test undefined

I'm doing a two-way between-within ANOVA in SPSS. I have two groups with 9 subjects each (so total = 18), and 24 levels of one repeated measure. I understand why Mauchly's test of Sphericity has no ...
1
vote
0answers
126 views

What statistical methods to use for analysis of a scenario questionnaire?

I've produced a questionnaire with 3 parts, demographics, attitude questions, and then a final section on particular scenarios. I'm looking to analysis people's response to the scenarios - as in what ...
1
vote
2answers
249 views

How to analyse three way ANOVA that also has pre-post and one within subjects factor?

I'm currently having a problem understanding on how to enter and calculate my data in SPSS. I have a three way design in which there are 2 variables each in Experts vs Novice; Guided Discovery vs ...
0
votes
1answer
162 views

Two-way ANOVA repeated measures

I would like to know, if you got a significant interaction in a two-way repeated measures ANOVA in SPSS, how can you visualize the interaction (especially using syntax)?
3
votes
1answer
272 views

Checking normality of residuals in 2x2 mixed methods ANOVA

I am running a 2x2 mixed method ANOVA (with one between-group factor and one within-group factor - time 1 and time 2). I want to check whether the assumption of normality of residuals is met. When I ...
3
votes
1answer
369 views

Variances not homogeneous problem in ANOVA mixed between-within subjects, too bad?

I'm conducting a 2x3 mixed between-within subjects ANOVA (group x time). I have 20 participants, 10 for each group, who undergo all the 3 measures over time. Levene's test of equality of variances is ...
0
votes
1answer
1k views

Normality test for anova mixed model in SPSS: I did it in two ways but the results are contrasting

I'm conducting an ANOVA mixed model 2 X 3 (group X condition). Right now, I'm checking for the assumptions of ANOVA, such as normality. I should check indipendently for group and condition, right? I ...
5
votes
2answers
3k views

Post hoc test in a 2x3 mixed design ANOVA using SPSS?

I have two groups of 10 participants who were assessed three times during an experiment. To test for differences between groups and across the three assessments, I ran a 2x3 mixed design ANOVA with ...
3
votes
2answers
2k views

Calculating eta squared from F and df

I'm trying to compute ANOVA effect sizes from papers that provide an F value without other information. If I understand correctly, the effect size for a single-factor ANOVA is $$ \eta {2} = ...
2
votes
2answers
893 views

How to do repeated measures ANOVA for two groups in SPSS and 12 time points?

I am measuring one parameter (say weight) repeatedly at different time points (say monthly, for 1 year) for two groups (say experimental and control groups). My data looks something like data posted ...
2
votes
0answers
59 views

ANOVA variable that is both BETWEEN & WITHIN

Does anyone know how / if can you treat an independent variable as BOTH a between AND within subjects variable (ideally in SPSS ANOVA-repeated measures). That is, we have a repeated measures study ...
5
votes
1answer
405 views

Justification for low/high or tertiary splits in ANOVA

I have two groups of participants and they all took the same measurements. When I perform a median split on one of the measurements to test my hypothesis about an interaction, the dependent ...