# Questions tagged [repeated-measures]

Repeated measures data occur when more than one measurement is collected on the same unit (e.g. subject). Use this tag for RM-ANOVA together with [anova] tag.

2,770 questions
Filter by
Sorted by
Tagged with
1 vote
48 views

### Multilevel Model Residuals Scatterplot Assumptions

I am conducting multilevel modelling (MLM) in SPSS (mixed modeling) to analyze cross-sectional repeated measures data. One of my dependent variables is a survey question scaled 1 to 10, which ...
• 53
5 views

### Modeling Condition Specific Associations

I am trying to model a crossover repeated measures design in which individuals complete both the active and control conditions. These individuals also complete cognitive testing before and after both ...
1 vote
34 views

### Selecting random effects in a linear mixed model when all participants complete all repeated measures?

Participants read 10 pairs of stories from Author A and Author B on 10 different topics (different topic for each pair). For each pair, they indicated whether they preferred Author A, Author B, or ...
9 views

### Repeated-Measurements Analysis with Cross Correlation

I am trying to find the cause-and-effect relationship between water release from dams and downstream temperature. I have a data frame containing all of the temperature measurements from various sites ...
35 views

### Best Practices for Splitting Data in a Repeated Measures Classification Problem

I am working on a classification problem involving repeated measures. My objective is to classify positive patients as early as possible. In my practical application scenario, once the target becomes ...
12 views

### Post-hoc tests for repeated measures ANOVA with aligned rank transformed(ART) data

I'm working on a 2x3 factorial design with two within-subject variables and I'd like to test for both main and interaction effects. Since the data is not normally distributed, I've performed an ...
36 views

### Longitudinal analysis of peer effect

I am working with hierarchical data (2 repeated observations on children nested within households), obtained from a RCT with 2 treatment groups. The primary goal of my analysis is to see whether the ...
9 views

### Repeated measures analysis of covariance literature

Does anyone have a literature to study about repeated measures ANCOVA? For example, the concept, assumption, and how to calculate manually?
55 views

### Repeated measures ANOVA

I would like to seek help with a statistical analysis. I am conducting a study on the learning outcomes of different teaching methods. My dataset includes student IDs, binary data on exam performance (...
• 1
27 views

### Ancova or other test?

I am struggling to select the correct type of test for my data and would like to eventually run it in R. The design is as follows: A treatment vs control group of plants From each plant the following ...
43 views

### How to fit a binomial model with repeated observations per subject

I have a small dataset for 100 participants. The dataset includes repeated 'tests' over a course of a week. A test can have the binary outcome of pass or fail, and the same number of tests are not ...
• 21
16 views

### Which type of ANOVA is the right choice?

I have a data set as follows and I'm wondering how: (i) this should be organised for an ANOVA test and (ii) which ANOVA (two-way mixed, two-way repeated measures) test is the correct one. ...
• 1
34 views

### multilevel moderated mediation with Lavaan in R - failed to converge

This is a repeated measure study, we have X, Y, Mediator, and a moderator, which we hypothesis can moderate the mediation relationship. So I have level 1 and level 2 for between subjects and within ...
• 11
1 vote
89 views

### Repeated Measures Analysis of Variance Question

I have the following data set. ...
• 247
22 views

### Analysis of Variance Assumption Testing When Multiple Error Terms Are Used

I am conducting a repeated-measures analysis in R, where blocks were sampled repeatedly over a season. ...
• 247
80 views

### Non-Parametric Two Way Within-Subjects ANOVA

I have a dataset with 4 individuals that are measured twice in each of the 5 groups (so in total 40 observations). Subject ID Group Value 1 1 A 45 1 2 A 62 1 1 B 70 1 2 B 37 ... ... ... ... 4 2 ...
1 vote
27 views

### Bayesian multivariate regression with repeated measures

I am trying to estimate variance components (specifically, genetic correlations) using mixed-effects models. My random effect is subject id and my dependent variables y1 and y2 are categorical scores ...
• 11
1 vote
34 views

### Independence assumptions in correlations when all data comes from same individual

This feels like a silly question, but anyhow - do the independence assumptions in common correlation tests matter much if all the data comes from the same individual and I don't want to make any ...
• 13
20 views

### How to do repeated measures mixed effects analysis with covariate in R

I have a dataset that consists of the oxygen consumption (MO2) values for 3 different species of fish. My experiment was a repeated measures design where I measured MO2 of the same 14 fish per species ...
• 31
122 views

### Sample size for REPEATED MEASURES ANOVA

I am calculating a required sample size for the Repeated Measures ANOVA (within subject). I came across two different packages and the results are different. Using "WebPower" package and the ...
1 vote
47 views

### What is the best approach to look at association between change in X and change in Y?

What is the correct approach to analyze the association between changes in two variables with two synchronous repeated measurements? I have calculated delta change scores for variables X and Y both ...
• 309
22 views

### Repeated measurements of proportions with no information on individual subjects

I am working on a dataset (not mine) that includes repeated measurements of proportions, measured at 50 equally spaced time points. There are two groups. Group A has 65 individuals, and group B has 23 ...
1 vote
23 views

### Fisher exact test in correlated dataset

Suppose I have n subjects. I have measured them twice with some binary outcomes. Now I want to test whether outcomes measured earlier agree with outcome measured later. Usually, I would need to do ...
• 1,445
35 views

### The repeated measures, mixed effects models

My dataset contains participants who have been treated with intervention or placebo, the outcome is salivaflow (continous) and is measured at 0, 4 and 12 months. The outcome variable ($Y_{i}$) is the ...
1 vote
66 views

This is my first attempt with multi-level analysis. My research question is; How does the freshness of different types of bread (6 level) within a bread basket, change over two time points (ranging 4-...
• 11
16 views

### Combining Variation and Uncertainty from Replicate measurements

I have 3 measurements from 3 independent experiments {m_1, m_2, m_3}. I have another 3 measurements that are used to scale the m measurements {n_1, n_2, n_3} from the same experiment (different from m)...
49 views

### Can a GLM Binomial regression on repeated measures be seen as a trustworthy alternative for a Survival Analysis?

I'm working on an actuarial project to estimate monthly probabilities that someone becomes disabled. We have data available in a wide format. For example, the following lines are part of the data: ...
43 views

### within- and between-subjects variance and independence of observations

I came across some statements saying that if the within-subjects and between-subjects standard deviations are similar, the observations can be considered independent even if repeated measures exist (e....
• 15
14 views

### How to check if an intervention helps a continuous variable (angle) stay within normal limits?

I have two different surgical interventions, and they are both used to treat cervical stenosis. One of the predictors of long-term success is the spinal alignment (relative angles of the vertebra). ...
25 views

### Variance ratio below 3

Can it be assumed that the repeated measures (RM) ANOVA is robust, even after having a significant Levene test for a variable? What about if the ratio between the maximum and minimum variance is below ...
39 views

### Factor Scores explain less Variance than Item means in a multilevel cfa

I conducted a multilevel confirmatory factor analysis (CFA) in lavaan on repeated measures questionnaire data (satisfaction with travel scale). 42 participants had ...
36 views

### Multilevel Modelling with Crossed and Nested Factors in R

I am trying to create a model to determine the effects of Stations and Circuits (and any interaction) on students scores in an OSCE exam, using the lmer function in R. I have 3 factors: circuit $\beta$...
14 views

### Mixed model for repeated measures logistic regression?

I ran an experiment where participants were randomly assigned to one of two conditions (control vs. treatment). In both conditions they had to make 8 binary choices. That is they were presented two ...
• 31
1 vote
35 views

### How to do analysis of correlation from multiple-timepoints measurements?

My case is analyzing the association between the concentration of HIV DNA prior to therapy (time point 0, $t_0$) and the concentrations of biomarkers of HIV infection after therapy, measured in 6 time ...
• 13
52 views

### Sample size calculation within-subject

I need to conduct a sample size analysis for an experiment with the following characteristics: One intra-subject independent variable is the type of cheese with two levels, Cheese A (1) and Cheese B (...
• 1
12 views

### nonparametric model for longitudinal data analysis

For the longitudinal data provided below, we have the following variables: the response variable 'y', the time variable 'week', 'grp' (with two levels: treatment and control), and 'subject'. My ...
• 1,173
76 views

### untrustworthy p values? emtrends following lmms with fixed effects of different levels of repetition

Edited to clarify further 23/04/24: I have a fairly complex linear mixed effect model in R and I believe that there are issues to do with repeated data when running my post hoc tests. The model ...
16 views

### Most suitable statistical model in an unbalanced, repeated-measures, paired observations setting

I've got the following dataset. For every subject, brain data has been recorded across different days, and for each day, in different states (sleep/awake). Data has been recorded in many channels ...
• 1
30 views

### What is the correct stat model to test whether there is a significant difference over time and between two conditions whitin participants?

I'm conducting a study using a within-subject repeated-measures design to examine changes in anxiety levels over time. Participants experience two conditions: salient positive and salient negative. In ...
18 views

### Reasons for failure of convergence in multiple imputation in wide format of (longitudinally) repeated Likert items

Our group is working on a dataset of approximately 1000 patients with 10 complete variables at the time of an acute disease, who subsequently completed a questionnaire of 5 Likert items (questions ...
• 305
72 views

### How should I analyze data that is paired and also repeatedly measured?

I have data collected from the same subjects (n=10) over 11 days, with measurements taken under two conditions each day: immediately after training(D0) and 30 minutes after training(D30). The data is ...
• 21
55 views

### Is a correction for sphericity violation needed for post-hoc comparisons following repeated-measures ANOVA?

In a repeated-measures ANOVA, there is an assumption of sphericity, so that the variance of differences between groups is similar for all pairs of groups. A violation of this assumption can be ...
• 11
28 views

### A Priori Sample Size Needed for Linear Mixed Model

I'm new to the site so I apologize if I fail to follow some norms. I am an early-stage doc student and am still early in my stats courses. In a class, I want to propose the following experiment based ...
• 1
63 views

### How do I calculate the power and effect size for the Wald-type statistic of the RM-function from the MANOVA.RM package in R?

I have calculated the RM-function from the MANOVA.RM package in R and now need to calculate the statistical power of the test and the effect size for its Wald-type-statistic, including the ...
15 views

### How to compare frequencies of type of stress events with repeated measurements over time in a weekly diary study?

We hope you can help clarify whether a Chi-square test of equal frequencies (in SPSS) would be the correct choice. Study participants have reported experienced stress events (text variable) in a ...
37 views

### Within subject experiments done by (some) Psychologists

Thanks in advance for any responses or resources you can link me to. I've had more of an Econ/Stats training and recently I've been working with some people who have a Psych background at work. They ...
27 views

### Additional covariate reduces AIC in mixed models (LMM, GLMM, GAM)

In repeated measure for timepoints in different Group, Age and Gender act as a covariate in ...
• 21
1 vote
51 views

### Within group vs between group variance in an RCT: how to handle?

I have a question about how far the naive treament effect estimator can go wrong when there is appreciable within group variance vs between group variance in an RCT, and what we can do about it ...
• 149