1
vote
1answer
18 views

post-hoc for non homogeneous data

Which post-hoc test is used for non homogeneous data. I have checked my data set and they are normally distributes. I used Anova with Levene's test and it showed that my data is not homogeneous, and ...
1
vote
2answers
75 views

data analysis, dissertation of thesis? help please?

I'm having a problem with my dissertation. My research is "level of satisfaction in relation to customer service: comparative study between 2 fast foods my questionnaire consists of 19 questions. ...
0
votes
0answers
8 views

ICC to assess independence of observations in a cluster randomized trial

How can I compute an ICC to assess independence of observation assumption using SPSS for ANOVA. The data on two DVs were collected from participants one time over 28 weeks in 28 clusters (so this is ...
0
votes
0answers
6 views

Bootstrapping with random effects in SPSS

I'd like to use bootstrapping in my two-way ANOVA containing two fixed and one random factor. Why is the bootstrapping method not available (greyed out) for models containing a random factor? Thanks! ...
0
votes
0answers
21 views

How can I perform a post hoc test of a three-way interaction in SPSS using the 'test' command?

I will describe the design of the experiment briefly. The task have two within-subject variables ($A$ and $B$), A. have two levels B. have three levels one repeated variable with 5 levels ('time ...
1
vote
0answers
83 views

How to: repeated measures anova and Friedman's test with multiple imputations for missing data

I have a study where patients were measured pre-operatively (time_pre), post-operatively (time_post) and long-term follow-up (time_lt). I have 60 subjects. Data consists of: 5 scale variables ...
1
vote
0answers
37 views

Repeated measures ANOVA with missing data

I have a DB with multiple missing values (scale, ordinal and nominal). I used multiple imputation to fill in these missing values. How can I perform a repeated measures ANOVA on these (5) datasets? ...
0
votes
0answers
24 views

Split plot ANOVA or t-test

I did a study in which I wanted to see if a teaching intervention would have an effect on student learning. I nonrandomly divided students into two groups, a control and experimental group, and gave ...
1
vote
1answer
233 views

Interaction/Moderation effect in ANOVA - variable is not one of the factors

I am running an univariate ANOVA in SPSS to test my hypotheses for my 3x2 between subjects design experiment. The factors for the ANOVA are review valence (3 levels) and presence of brand (2 levels). ...
1
vote
1answer
40 views

2x2 ANOVA interactions

I'm doing a masters project where I look for effects of font (fluent, disfluent) on two populations' (control, dyslexic) reading comprehension. SPSS only gives me a significant main effect for ...
1
vote
0answers
55 views

Repeated Measures ANOVA pairing counterbalance issue

I have been conducting all of my analyses on one DV (Quality) using a repeated measures ANOVA, with two variable (Time and Gender) at two levels each. However, it occurred to me today, that this might ...
0
votes
0answers
48 views

Repeated Measures ANOVA or mixed model? And with massive group differences?

I need some guidance on which statistical test to use: I want to know if the nature of frog calls changes depending on the time of day. I observed 4 species of frogs at the same 3 times for several ...
0
votes
0answers
11 views

slowing down effect

I am looking for an algorithm or function to look at the difference in reaction times after negative feedback. The problem is that I need to consider just the times in which negative feedback came ...
4
votes
1answer
292 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
103 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
42 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
154 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
32 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
112 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
24 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
19 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
32 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
97 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
81 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 ...
5
votes
1answer
404 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
199 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 ...
1
vote
0answers
94 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
3answers
567 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
448 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
1k 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. ...
2
votes
1answer
2k 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 ...
2
votes
1answer
221 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
2k 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
142 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
194 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
500 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 ...
9
votes
3answers
3k 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
190 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
939 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
930 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
424 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
2answers
1k views

Post-hoc for 2x2 mixed design ANOVA using SPSS

I am analysing an experiment run with 20 participants using a $2\times 2$ mixed design ANOVA. The experiment has one within subjects variable A with two levels (a1, a2) one between subjects ...
2
votes
1answer
153 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
316 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
496 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
1k 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
185 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
445 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
178 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)?