Repeated measures data occurs when more than one measurement is collected on the same unit (e.g. subject). This data cannot be analysed through normal methods because the rows in the data are not independent due to the multiple measurements. The time sequencing of the measures may not be important.

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Pretest posttest regression

I am trying to set up a multiple regression for a pretest posttest dependent variable. There will be no control group, and we will be controlling for age (continuous) and gender. Want to use the ...
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Summary statistics & CIs for sample variances from multiple populations

Suppose $X_i$ are $n$ random variables that are all distributed normally, but with differing means and standard deviations: $X_i \sim N(\mu_i, \sigma_i)$. Now suppose $y_{ij}$ is the $j$-th random ...
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Normality test for repeated measures data

I've measured the motor function of the same subjects (n=6) over 7 different time points. I would like to know whether the mean motor function varies significantly with time (day 1 versus day 2 etc) ...
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repeated measures ANOVA, crossover trial, R

I am sorry for stating such a question. Unfortunatelly, it's very-very hard to go through all statistics. I have a crossover study design with 3 treatments, 3 periods, and a baseline (covariate). The ...
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Apparently varying effects in experimental replicates

We are testing whether Drug A increases particle count over control. When we were designing the experiments and knowing that there is a good deal of biological variability, we included both technical ...
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Comparing means between 3 categories across 10 subjects with repeated-measures

I have 10 animals ("fish") with 30 trials for each one of them. Those 300 trials are classified into 3 categories ("classification") and each trial is associated with a continuous variable ...
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35 views

ANOVA for paired data

I'm asking just of curiosity. If I have, for example, paired data and 3 groups (for example, baseline, 1 week, 2 weeks of treatment: I mean we take some samples at the baseline, then we apply some ...
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14 views

conditional independence in repeated measures design

How the responses are independent when conditioned on random effect in repeated measure analysis (linear mixed model)?
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17 views

Repeated measures ANOVA with replicated measurements.

I have performed an experiment testing 3 different modes of operation on 16 participants. Each mode of operation was tested twice per user. ...
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36 views

Effect sizes in within-subject design on R

I'm doing a meta-analysis but I need your precious help on couple things : 1) First, on R, in the compute.es package, I found only effect sizes computation formula ...
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77 views

Mixed, repeated measure model specification and results interpretation using LMER in R

I am working with data from a computer task which has 288 total trials, each of which can be categorically classified according to Trial Type, Number of Stimuli, and Probe Location. Because I want to ...
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8 views

Comparison test of reapeated Cohen's kappa

Suppose two raters judged a set of stimuli. Then Cohen's kappa was calculated as measure of inter-rater agreement ($\kappa_{pre-training}$). Suppose now that after a training session, the same two ...
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41 views

Factor analysis with repeated measures

Multilevel factor analysis seems to be the technical term for factor analysis with repeated measures, judging from this abstract. To be precise, following Wikipedia's factor analysis notation, the ...
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21 views

Power analysis for repeated measures design with ordinal response

I am designing a randomised pretest-posttest trial for which I'm trying to do a sample size calculation. My brain is about to explode from confusion, so I hope someone can help me. Just a little ...
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Testing significance of a treatment inducing correlations over a time series

Example data In the example dataset, there are 3 distinct biological measurements, over 3 time points (0,12,24hrs) for 19 individuals. These individuals have been divided into 2 groups: treatment and ...
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19 views

Pre-post analysis with multiple post measures

I am having trouble deciding what type of analysis to use for the following data: I have two groups (one control, one treatment) and took a pre-measure of my dependent variable, and then 3 ...
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34 views

Identifying outliers for within-patient numerical data

I have a simple dataset of people's heights, many people with measurements on multiple days (once a year for 10 years, say). I have the date of each measurement. Some of the height values are ...
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13 views

Variation of binary responses between repeated measures

I am bit confused in terms of analyzing my data. I have done an experiment which involves testing of detection systems with controlled footage.The footage has been grouped based on scene properties ...
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29 views

SPSS Contrasts for a Five-Way Within-Subjects ANOVA (Yes, You read correctly)

I have a 4 x 4 x 2 x 2 x 2 repeated measures design and I'm trying to test a contrast for just the first variable (here called "SOA"), averaging over the others, in SPSS. Initially, I thought it ...
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42 views

Probability of event happening when data is aggregated with many independent events over the course of time

Let's say you have $X$ coins, each with a differing probability of landing heads (e.g. coin 1 has 10% chance of landing heads, coin 2 has 20% chance of landing heads, etc.). Now, let's say that you ...
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14 views

GLMM - time or day/date as a random factor

I have searched for many days trying to find the answer to this question, and am still not 100% sure I am happy with my conclusion. I am interested in looking at the effects of environmental variables ...
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Standardizing unbalanced repeated measures data

I have a dataset of height and weight measurements for adult patients in hospital clinic and want to calculate a standardized measure of boy mass index (BMI). For a given pair of measurements, it is ...
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34 views

How to analyze full-factorial within-subject experiment with ordinal (likert) data?

How can I analyze an within-subject full-factorial experiment with ordinal data from likert scale (with repetitions)? I would greatly appreciate your help. Study design Here is a description of the ...
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49 views

Mixed model in SPSS with random effect and repeated measures

I am working on analyzing a dataset that involves repeated measures data. The data was previously analyzed by a colleague using custom code written in C++, but I have expanded the dataset and am ...
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Single Categorical DV (3 levels), and Single Continuous Repeated Measure IV: which test?

I'm a Ph.D. psych student and am having trouble finding information on which test to use for a continuous repeated measures IV and categorical DV. I would really appreciate some help with this. The ...
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22 views

Is it possible to measure the independent variable with part of the dependent variable

I have Beta as my independent variable and Economic value added (EVA) as my dependent variable. To calculate EVA I need to use Cost of capital and to calculate that I have to use Beta, so is it ...
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Estimation of change and difference in changes for repeated measurements

In an ongoing project concerning life style changes, I can't find the way to study the difference in effects over time between the intervention and the control group. The project is set up as a an ...
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26 views

feature selection for longitudinal data

I have a longitudinal data which looks like this. Number of time points are different for each ID. Y is the binary response variable (take values 0 & 1) and X1-X20 are either continuous or ...
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Repeated measurement model for Dichotomous variable in spss?

I have a repeated data in 7 diffrent time and 4 group. my variable is Dichotomous (yes/no). How I can do it with spss? what non-parametric test could I use? I appreciate your answers Leili
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33 views

Cosinor analysis with repeated cycles

I'm interested in developing a model for the circadian rhythm of hormone levels via a cosinor analysis. I just started looking into cosinor analyses so I have a few questions. The data is being ...
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71 views

How to model the effect of time in a balanced repeated measures design with 2 measures each at baseline, during instruction and post instruction?

I want to examine growth for 38 participants. I have 2 scores at each of 3 separate phases of instruction - baseline, during instruction, and post instruction. Restated, I have 2 baseline scores, 2 ...
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some suggestions for analyzing two-factor within subject design?

I'm doing a two-factor within-subject design experiment, and the two factors are all categorical variables. factor one has four categories, while factor two has two categories, and is counterbalanced. ...
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142 views

Why am I getting inconsistent results from Wilcoxon signed rank test and Kruskal-Wallis test?

I am doing a study on 3 drugs, comparing response pre-post treatment. My objective is to know if these drugs are effective and which one is better. I used non parametric tests since the results ...
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1answer
48 views

Two-way repeated measures ANOVA with unbalanced data

I have a system / operator repeated measures data set for which I would like to answer the questions: is system 1 quicker than system 2 is operator 1 quicker than operator 2 does the order of using ...
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46 views

How to do multiple regression with within-subject independent variables using SPSS?

I have two groups of subjects, both undergoing two experimental conditions. During the experimental conditions, the subjects take questionnaires for evaluation of the mood states, and blood pressure ...
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46 views

Specifying variable levels in multilevel repeated measures in R using lme4

I am trying to analyze a dataset in which there are three measures on patients within areal units, however I am having trouble in how I am thinking about random/fixed effects and including covariates ...
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Getting unexpected lme results

I am evaluating an experiment in which subjects had to rate quality of audio files. The design of the experiment is repeated-measures. So I'm trying to figure out which factors have an impact on ...
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57 views

How do I perform this complicated ANOVA type analysis in R?

I have the following type of dataset: | | | variable_r | subject | gender | age_group | Cond_1 | Cond_2 | ...
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62 views

$\textit{Post hoc}$ test after repeated measures ANOVA (LME + Multcomp)

I have a dataset where the samples are dependent, belong to different groups, and measurements were taken over time. It looks like this: Subject Group Time Value S1 G1 12h 5.55 S1 G1 24h ...
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How to confirm a two-way interaction in a three-way ANOVA model using SPSS

I have two groups of subjects, both undergoing two experimental conditions, and data are collected at two time points: pre- and post- condition. I run a 3-way ANOVA, with one between subject factor ...
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1answer
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ANOVA with repeated mesures - No random groups

I have 4 groups, 3 of them receiving a treatment and the last nothing. I will do two mesures, before and after the treatment. But my groups are pre-defined, not resulting of a random selection. Is ...
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12 views

How to do and interpret a generalized estimating equation

My study is looking at the effects of enclosure type (1 IV (penned v not penned)) on the stereotypical behaviours and interactions (2 DV's (counts)) of elephants, however using rain (yes/no) and high ...
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1answer
34 views

Can I use ANOVA if a sample is not normally distributed

My data are not normally distributed. I have to compare three groups for their achievement in skill learning. $n=4$ in each group. I have used three methods ($M1$, $M2$ and $M3$) to teach one skill to ...
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41 views

comparing a variable (that is repeatedly measured) between groups in R

I have a rather simple question (I hope) but for some reason I can't find the right/ a working answer anywhere on the web. For my research I have measured mood on a scale 1-10, 6 times a day for 5 ...
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12 views

Oddly structured data - longitudinal data struggle - Interaction testing

I'm struggling with an analysis and I'd like to have your contribution. I work with neuroimaging, and I have tested the capacity of a certain imaging parameter (let's call it A) of predicting a ...
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52 views

Statistic for count process and measurements

I am facing some problems concerning which statistical approach to use for my measurements. I have a sensors which counts how many times an events occured. I had to characterize two lots of sensors, ...
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Can repeated measures ANOVA be used with only 2 time points?

I am analyzing my data of my experiment and I have a question concerning the repeated measures ANOVA. I have 2 independent variables (temperature and salinity), 1 dependent which is length and 2 ...
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43 views

Repeated measure two-way ANOVA (non-parametric)

Non-parametric ANOVA – a hot topic that is unanswered. There are many questions on this topic online. However, they all seem to end in a debate and no definite answer or clear explanation (that I ...
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37 views

ANOVA to find subjects that responded significantly different between treatments

I have a dataset composed of several subjects exposed to two different treatments (treat) in three distinct times (test), and I am interested in highlighting which subjects have significantly ...
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Help: Am I using the correct test to detect differences from zero (multivariate ANOVA repeated mesures)

01 August 2014 11:17 Hi, I have 5 measures repeated 3 times under 3 different scenarios (conditions). The measures are survey questions and participants use a visual analogue scale to mark a ...