# Tagged Questions

37 views

### Running a Tukey's test on a repeated measures ANOVA in R

I've come across several posts dealing with post hoc tests of Repeated Measurs ANOVA. I came up with the below code in R to attempt this, but considering some of the posts on this subject I wanted to ...
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### 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 ...
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### Repeated ANOVA unbalanced data

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 the test phase was 7 days. I tried to do my ...
36 views

### Interpretation of p-value for one-way ANOVA and two-way ANOVA

We are currently handling some results and performing some ANOVA tests on human search performance in virtual environments using different sound systems for audio rendering. We measure the time it ...
81 views

### How to deal with unbalanced group sizes in mixed design analysis?

I have 2 x 2 x 2 mixed design with two between subject factors (sex, organizer) and one within subjects factor (task). The group sizes of the 'sex'-factor is unequal. When I perform a factorial ...
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### Repeated measures one way ANOVA inconsistent with paired t- test result?

I have a repeated measures one way ANOVA with a significant interaction, but no significant main effects. I ran a paired samples t-test to further my analysis and found a significant difference ...
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### Contrasts for one factor in a repeated-measures ANOVA

I am trying to set custom orthogonal contrasts for a repeated-measures design using R. Is it possible to set contrasts just for one factor? The model looks like this: ...
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### Is this a 2-ways repeated measures ANOVA?

Imagine a long, horizontal, transparent acrylic tube which is marked with duct tape every 50 cm in such a way that you can distinguish 10 "sections" of the tube. I want to study the movements of ants ...
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### Estimated marginal means significant, interaction not

This is probably pretty basic question, but how come I can get totally non-significant 3-way interaction, while all the marginal means are significant? See the 3 way interaction in the table.
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### Repeated measurement analysis advice in R lme and / or aov and a couple of more questions

I want to analyse the visual performance, operationalized via contrast threshold, depending on adaptation luminance and spectrum, gathered for 29 subjects. I'm currently kind of confused of how to do ...
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### Repeated Measures of Dependent Randomized Conditions

I'm designing an experiment to evaluate how learnable a software tool is. The basic setup is to have $n$ subjects perform $m$ tasks in a random order, and then test whether the subjects performed ...
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### Does adding a dataset in repeated measures change the type of test?

I am trying to design a test and am confused between the types of experiment that I should be conducting. Here is the description of what I am doing: It is a repeated measures test. So, a participant ...
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### Is there a better test?

I have data of the following sort: There are numerous individuals. This total set of individuals is classified according to three treatments.The first two treatments each divide the total set of ...
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### Is this a repeated measures design or not?

How do you describe, or what do you call, a test that uses two factors as independent variables but uses a dependent variable that is a difference between two measures taken repeatedly from the same ...
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### One factor repeated measures where first time point is a control

Patients were randomized to two groups (control and intervention). Each patient is evaluated at 3 time points. The first time point is taken pre-intervention, so it should have the same mean response ...
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### How should I explain the lack of ERROR in a repeated measures ANOVA table using REML?

I have conducted a repeated measures ANOVA using a Linear mixed-effects model fit with REML in R. When I report the results I include the ANOVA table output by ...
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### Repeated Measures ANOVA interpretation with specified Error () in R

I'm struggling with interpreting the output from R for a two-way repeated measures ANOVA. I used ...
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### 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 ...
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### Violation of Normality in Mixed Design ANOVA

I conducted a study in which two groups of teachers (pre-service and veteran) all watched four video clips of instances of aggression between students. The clips differed by type of aggression and ...
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### Interpreting Two-way repeated measures ANOVA results: Post-hoc tests allowed without significant interaction?

I have conducted a study where I employed a two-way repeated measures design to investigate whether subjects respond to a main treatment effect. What I'm mainly interested in is whether subjects ...
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### fitting a model of each subject and perform a t-test over the estimated parameters

In my field, psychophysics/experimental psychology, sometimes a lot of measures are collected for each subject. Then, a model is fitted for each subject and with the estimated parameters sometimes a ...
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### Drug affects individuals but ANOVA not significant: references?

Let's suppose that I measure the effect of a drug on blood pressure in several people many times. For some people, the drug increases blood pressure significantly and for others decreases it ...
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### Linear mixed model for repeated measures analysis with missing values

we have ran an experiment where we compared three interaction techniques for a 3d docking task. So we had two factors: the aforementioned technique type and a factor representing the direction ...
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### Unbalanced repeated measures

I'm new to using R and therefore I have some doubts. I have a data table with measures gland secretion of chickens at two ages different, sometimes we just need a measure therefore is not balanced. ...
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### Can I use independent-measures ANOVA instead of repeated-measures when I have only one subject?

I have some data where I've measured the response times of the same participants in two sessions and within 36 conditions (each participant took part in all 36 conditions). So the data are repeated ...
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### How to handle empty groups in a repeated measurements two way ANOVA

Suppose you have N individuals you would like to test. You test at the same time for two categorical conditions where condition one could be A,B or C and condition 2 could be W,X,Y,Z. You test every ...
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### Two way ANOVA or two way repeated measurments ANOVA

My study design: I had a N (150) number of longitudinal data files describing growth curves. Every data file I fitted on 4 different models and starting at 4 different points Not every fit was a hit ...
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### Repeated measures ANOVA for an experiment with missing values (unbalaced)

I have an experiment where several subjects (subjects={S1,S2,..Sm})were asked to perform a set of tasks (tasks={T1, T2, T3, ..Tn}) using both their left (L) and right (R) arms. Each task for each arm ...
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### Proper methods for this case of repeated measures?

I am measuring hormone changes in animals. I have three groups: Groups A, B, and C. In each group, blood was collected from the SAME individuals for hormone assay at 0, 15, 30, and 60 min. This was ...
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### 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, ...
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### 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 ...
320 views

### How to report result from two-way repeated measures ANOVA?

I have conducted an empirical study as part of my master thesis. I have developed a software tool where cards can be sorted (affinity diagram) and in the study each test subject did a number of ...
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### Repeated Measures ANOVA variation

I'm trying to design an experiment using repeated measures ANOVA. I have one (possibly two) factors I want to test. I have 5 factor levels that I want to show that there is a difference between. I ...
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### Whether to perform a 3 by 2 repeated measures ANOVA or three separate paired t-tests?

I have $2\times 3$ repeated measures design. 2 conditions(a and b) 3 intensities (low, medium and high). I am concerned only with the a to b differences at the corresponding intensity. For ...
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### Three way anova

I am really hoping you can shed some light on a topic that I am struggling with. I have a 2x3x4 repeated measured anova. I have a significant 3-way interaction, and I want to make sure that I am ...
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### Repeated Measures ANOVA that is NOT fully factorial

I'm trying to design an experiment using repeated measures ANOVA. I have one (possibly two) factors I want to test. I have 5 factor levels that I want to show that there is a difference between. I ...
171 views

### Mixed effects model or mixed design ANOVA in R

I'm wondering if you could quickly advise on the best statistical analysis for my data. I have a designed experiment with 12 plots within one larger area. This area was blocked into 6 to overcome ...
201 views

### Mixed-effects for repeated measures in Matlab — how to choose a model?

This post follows on from this one. I am trying to analyse a dataset: $S$ subjects were tested for $A$ measures in $B\times C$ conditions. I have worked out that I can perform a repeated measures ...
197 views

### ezAnova vs. lme for factorial repeated-measures design: results differ, why?

I have used lme and ezAnova to analyse data from a 2$\times$3 repeated-measures experiment. Theoretically those are two ...
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### Repeated measures ANOVA with covariate (SPSS) [closed]

I measured an attribute X (continuous variable) of the same set of companies' annual reporting at two points in time and now want to test whether the change in the attribute X is significant if one ...
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### Which model to choose for interactive effects within groups in SPSS

I have 4 diet groups (ST, MSG, TFA, MSG+TFA) and the cholesterol levels were checked at 20wk, 32wk and 40wk. From the raw data it is quite clear that MSG+TFA group had high values of cholesterol ...
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### Two-way ANOVA robustness against normality violations

I recently read the article "Is It Really Robust?" (Schmider, E., Ziegler M., Danay, E., Beyer, L. & Bühner M., 2010) The authors of the article come to the conclusion that an ANOVA is quite ...
430 views

### 2x2x5 repeated measures ANOVA: significant 3-way interaction

I have 3 within-subject factors, namely offset (1px, ..., 5px), side (left, right) and color ...
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### Number of dependent variables

I have data from raters who each provided two ratings for a large set of categories. They were asked to rate how coherent each category was on a scale of 0 (members totally dissimilar) to 9 (members ...
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### Which repeated measure statistical test must I use in this case?

I have a set of general conditions A, B, C, D, E and F to solve a problem. Each of these conditions lead me to different number of experiments according to a parameter that i change in each general ...
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### Not all subjects undergo conjunction of two treatments, two-way within-subject (repeated-measures) ANOVA correct?

I am wondering about the correct statistical analysis for an experiment involving 2 independent variables (treatment A, 4 levels and treatment B, 2 levels) and one dependent variable (C, score). ...
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### 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 ...
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### Non-parametric test for comparing four treatments and three times

I am working with a dataset where I need to use non-parametric stats (won't go into details). It is behavioral data on captive animals ($n=8$), where $4$ treatments were introduced $3$ different times ...