# Tagged Questions

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### Analyzing within subjects time-limited factors

I have 2 x 2 x 2 mixed design with two between subject factors (sex, organizer) and one within subjects factor (task). The last factor has values for task 1 and task 2. Both tasks were timelimited, 3 ...
29 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 ...
70 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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### 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: ...
78 views

### Analysis of longitudinal data with very few points

I'm trying to analyse some data I've recently gotten my hands on, but I'm not entirely sure which model to use. One suggestion has been a Mixed Model, Repeated Measurements ANOVA, but I'm not sure if ...
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### How to do mixed logistic regression with multiple repeated measures in R?

I have data from a psychology experiment in which participants were assigned to one of 3 training conditions and then gave responses for 16 trials for each combination of two within-subjects factors, ...
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### Predictive model from ordinal panel data

Here's a hypothetical problem analogous to one that I am having trouble with: Prostate cancer biopsies are scored according to Gleason pattern (0-10). The scale is ordinal. Over 7 warrants surgery. ...
55 views

### Repeated-measures multiple regression that takes care of sphericity in R

I'm looking for a way to run a repeated-measures multiple regression in R, which would take care of sphericity - either by applying some corrections (such as Huynh-Feldt), or by avoiding the problem ...
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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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### How can I look for a correlation between dependent variables in a repeated-measures/within-subjects design?

I have a 2x3 within-subjects design, with two different dependent variables (DVs). I would like to know if the two DVs are correlated or not. Here is an example of what the data look like, e.g. a ...
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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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### What statistical test is appropriate for correlations within repeated measures?

We have $N$ individuals measured repeatedly in time. For each individual, at each measurement, we measure the values of two variables: $A$ and $B$. The number of measurements per individual might ...
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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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### Representing repeated measurements within sample plots in linear mixed effects model in R

I have collected data on gas fluxes from plots of soil subjected to 5 different treatments ("D2", "K2", "M", "N", and "O2"), which also possessed variable clay contents. The experiment was laid out ...
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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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### Analysis of repeated measures when fixed effect changes within-subjects?

I'm helping a colleague with a repeated-measures analysis in which each subject's fixed effect changes over the course of data collection. He's measuring a continuous, positive response variable ...
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### Partial $\eta^2$ for repeated measures ANOVA (with R's car package) [closed]

I have a 2-way repeated measures design (3 x 2), and I'd like to get figure out how to calculate effect sizes (partial eta squared). I have a matrix with data in it (called a) like so (repeated ...
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### Repeated measures across time, two treatment groups

I'm having difficulty modeling somethingâ€¦ I think it's fairly simple, but I'm just not confident enough in my ability. I setup an experiment with two treatment groups, six replicates in each ...
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### Help with repeated measures regression (in R)

I have some small datasets (example data given below) where I am interested in describing relationships between $Y_1$ and $Y_2$ across a gradient $X$ at two time points (date = "early" & "late"). ...
158 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 ...
141 views

### Finding correlations in longitudinal data analysis

We are doing research on video lecture watching. We offer a course which lasts four 5 weeks, and there are 9 or 10 videos in each week. We organize group-watching activities. A group usually is ...
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### 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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### Within-subject correlation before deciding on correlation structure in GEE

I want to have a look at the correlation coefficient for repeated measures in $x$ number of individuals. This will help me chose which correlation structure will best fit in GEE (Generalized ...
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### Post hoc tests for robust mixed design ANOVA using R

Is it possible to compute the function mcp2atm with unequal sample size? I ran the robust Mixed Design ANOVA by using tsplit and ...
410 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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### How to write the error term in repeated measures ANOVA in R

My question is very closely related to a previous post Error term in repeated measures ANOVA in R However, I would like to get more insight into how to define the error term. Suppose I have a ...
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### Is my random variable affecting my response?

I performed an experiment on coral colonies (10 colonies, randomly chosen in repeated measurements); manipulating aragonite/carbon chemistry and temperature (fixed effect) to analyse effects on the ...
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### Repeated Measures in R, SAS or SPSS: Whale Body Temperature Data

I have a question regarding a repeated measures experiment. I have 5 whales (randomly selected) that I recorded body temperature on. Data was collected via satellite, programmed to transmit records at ...
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### Repeated measures ANOVA in R for non-orthogonal design

I have data from a two-factor within-subjects experiment design where the conditions are not orthogonal. Factor one (Location) has three levels; factor two (Stimulus) has three levels, one of which is ...
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### Specifying a correct full model for an unbalanced repeated measures design in R lme4

Recently, I have done a fairly complex experiment, and I am having trouble coming up with a model that is suitable for the data. I have spent a few days reading about, e.g., when random effects should ...
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### Using lmer for repeated-measures linear mixed-effect model

EDIT 2: I originally thought I needed to run a two-factor ANOVA with repeated measures on one factor, but I now think a linear mixed-effect model will work better for my data. I think I nearly know ...
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### Repeated-measures error in R ezANOVA using more levels than subjects (balanced design)

I'm having a problem running a repeated-measures ANOVA in R using the ezANOVA function. I have data from 18 subjects - each subject participated in 3 conditions, ...
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### What factor (trials or blocks) to use in a repeated measures ANOVA

I am conducting a psycholinguistic experiment. Each trial consists of the subject responding to a word by pressing a button.The design of my experiment is as follows: 5 blocks of a 100 trials each ...
144 views

### Multilevel modeling of experimental data with repeated measures in the same condition of factorial experiment

I'm struggling with modeling some experimental data using the lme4 package in R, and would appreciate input. My experimental design is as follows: subjects ...
140 views

### Lmer model design

My data is a series of repeated measures in time (14 measures). I am trying to model the variable HbA1c which is a blood test performed at each visit to measure the ...
240 views

### Blocked repeated measures ANOVA in R

I am trying to test if richness varies by treatment (Severity) over time (Block) using a repeated measures ANOVA in R. Any suggestions on how to do this correctly? I have tried, but get an error ...
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### Pretest-posttest plus control design

I am evaluating the effect of an intervention (treatment: a lecture) on the ability to spot behavioral clues of emotions using visual stimuli using pretest-posttest plus control group experimental ...
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### Repeated-measures ANOVA looking at interactions for a BACI design in R

Here are my data: ...
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### How can I analyse results from repeated measures of mixed design in R

I want to investigate performance in a learning test, where my test animals have been submitted to a number of trials within test day over several test days. I want to investigate if there is an ...
730 views

### Post Hoc test for between subject factor in a repeated measures ANOVA in R

I have done an experiment of how different animal species affect nutrient fluxes in sediments. I had a number of experimental units (sediment boxes) to which different animal species were added. I ...
232 views

### One-way repeated measures anova

I tried finding an answer to this question on this and other sites but to no avail - if I am missing something please excuse my inability to locate the answer! Basically I have several dependent ...
143 views

### Two-way repeated measures ANOVA random factors missing data

I have a pretty simple time series experiment that I'd like to analyze in R. I have an experimental and control group and for each individual in each group I collected samples from them over a course ...
267 views

### Error term in repeated measures ANOVA in R

I am having problems with defining the error terms for a two way repeated measures ANOVA in R. My data consists of wood density estimates for three radial positions (inner, middle, and outer) along a ...
308 views

### Specification of error terms in aov() in R

For a two-way repeated measures design, we can specify the model using aov in the following fashion: ...
345 views

### How to interpret R output for two-way repeated measures ANOVA

How do I interpret the following output from R for a two-way repeated measures ANOVA ...
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### Between subjects repeated measures ANOVA in R - 5 brands, 11 measurements

In my research I have performed a series of measurements on 5 different brands of blocks. Each block has been inspected for deformation under incremental forces (20, 30, 40, 50, 60, 70, 80, 90, 100, ...
199 views

### How to construct GLMM model for repeated measures with binary responses with lmer

In my experiment I assigned subjects to one of the 3 treatments A, B or C. Within each treatment, a single subject was tested with two models sequentially. The test sequence was randomized. The ...
730 views

### Post-hoc test after 2-factor repeated measures ANOVA in R?

I have problems finding a solution regarding how to run a post-hoc test (Tukey HSD) after a 2-factor (both within-subjects) repeated-measures ANOVA in R. For the ANOVA, I've used the aov -function: ...