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.

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How do I structure my data in a time-lagged, multilevel mediation?

I am analyzing a repeated measures experiment using a multilevel growth curve in SPSS. I want to test a time-lagged, multilevel mediation model. My X variable is linear time in weeks (week 1, week 2, ...
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How to specify that I have both independent and repeated measures predictor variables in my glmer model?

I am having a little bit of trouble wrapping my head around how to specify my glmer model. My design is as follows: y is a binomial (Bernoulli) response variable x1 is a categorical (factor) ...
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Effects of pretest-posttest vs ANCOVA approach

I'm trying to see if performance on a task differs among conditions A, B and C. Participants completed an easier version of the task on day 1, and a harder version on day 2, when the intervention took ...
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How to analyze repeated measures data with categorical and continuous IVs

I'm trying to determine the best way to analyze my data. Participants completed a working memory task under two conditions-the order of which was counterbalanced. All participants completed both ...
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Alternative methods to multiple paired t-tests?

For my project, I want to compare user experience between different assessment formats for 4 different diagnoses groups. I am only interested in the within-group differences and do not want to compare ...
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Suitability of one-way repeated measures MANOVA

I'm undertaking a research study where I want to look at the difference between the value of a variable before and after an intervention. I've been suggested the one-way repeated measures MANOVA ...
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Mahalanobis distance in Repeated Measures [closed]

I have a study design with 3 dependent variables, each going over 6 levels. So I have 18 columns in SPSS with the dependent variables, 3 for each level. I want to calculate Mahalanobis distance. For ...
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Does anyone know what test SPSS uses when performing a post-hoc tests for within-subjects effect?

I am conducting a one-way repeated measures ANOVA in SPSS version 27. Does anyone know the name of the statistical test that SPSS performs for post hos tests for within-subjects effect when the box &...
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Should I use Tukey's test or Bonferroni?

Should I use Tukey's test or Bonferroni as post hoc test for repeated measures ANOVA? I appreciate your reply. /Michael
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Binary Repeated Measures with One Group

I have a set of experiment data that has one group of participants who answered questions under different experimental conditions (about 5 questions per experimental condition combination). The ...
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repeated measures ANOVA for radiology study?

I am wondering if I should use a repeated measures ANOVA or just an ordinary one-way ANOVA for the following study: I am assessing the image quality of 4 kinds of image reconstruction algorithms for ...
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Difference-in-difference and panel data models

I understand that according to the observations you have (two independent cross-sections in two or more time periods or the same individuals observed in two different periods), then difference-in-...
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Analyze Repeated Measures of a Frequency

I have the same group of participants (n=31,000) that answered the following question "What is your favorite subject?" by selecting one of three answer options (Science, Math, Art) at two ...
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Error terms for repeated measures ANOVA with among-subjects factors

What's the formula to calculate a sum of squares for the interaction between subjects S (nested within an among-subjects factor A) and a within-subjects factor B when there are other within-subjects ...
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How to analyze interdependent variables

I have a problem with my research. I have to analyze the changes of four variables within subjects at different time points (in times) and between subjects in two groups. The problem is that the 4 ...
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Does a linear mixed effects model with random effects make the samples independent for rANOVA?

I read a paper in which the authors used repeated measures ANOVA to compare linear mixed effects models with random effects in order to establish a a correlation between a DV and IV1. Each participant ...
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Repeated measures ANOVA in SPSS, but within-subjects factor is defined using a nominal variable

I have 10 dependent variables corresponding to the performance of the same subjects in 5 trials. To distinguish between the trials, I use a nominal "Trial" variable for each entry that can ...
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Multiple treatment levels in repeated measures anova

I have a simple experiment to run where the idea is to look at the influence of repetition over time. I am looking at one-way repeated measures anova but I am observing the response for 4 stimuli. So, ...
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two-way repeated measures ANOVA and long_db format

Good morning everybody Here I show a dataset I'm performing a statistical analysis on. Aside the meaning names of most remarkable variables are indicated: ...
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Performance Metrics on Within Subjects Study

I ran a simple yes or no within-subject experiment. i.e there were 4 conditions, and each participant answered a single question for a subset of images per condition. My question is how would I ...
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How to deal with this survival data?

I'm dealing with survival data which comes from hospital records. All the patients were diagnosed with cancer. During their stay at the hospital, patients are enrolled in treatment protocols (to ...
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Averaging repeated measures in ANOVA model

I am looking for an appropriate ANOVA model for the dataset I am working with in the assignment. Specifically, the dataset measures the mortality rate of diabetes per ethnicity group in different ...
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Poisson regression or ANOVA, repeated measures or independent?

I have been trying to figure out the best way to approach analysis of my data for a while now and I'm struggling to understand if a Poisson regression is correct and, embarrassingly, I'm not sure if ...
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When to use robust one-way repeated measure design ANOVA?

I have a set of 9 different factor levels from my independent variable to be compared against each other. Here are the results of the different assumption tests in R. I'm just going through my ...
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Why do faux::rnorm_multi and faux::rnorm_pre produce different results in a simulation of a repeated measures design? [closed]

I want to simulate repeatedly drawing two dependent samples for a t-test (ultimately for power simulation). To generate the correlated samples, I tried two functions from the faux-package: rnorm_pre: ...
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How can I run repeated measure ANCOVA in r?

I originally performed 2x2 repeated measure ANOVA using a dataset. There were two independent variables, within factors (foot position and limbs), and the single-leg jump heights were measured. For ...
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How to run the appropriate analysis in R - repeated measures with continuous independent and 2 different situations

I have a slightly complex analysis, I would appreciate it if someone could help me figure out how to write it in R and in what package. The variables: Dependent, all of them repeat measurements (each ...
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G*Power settings to find minimum sample size for a 2x2x3 design

For a power analysis, does "number of measurements" refer to the number of LEVELS or the total number of CONDITIONS? I have a three-way (2x3x2) ANOVA that is entirely within-subjects, and I'...
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Perform a principal component analysis (PCA) with repeated measured items using multiple factor analysis in R

Given Data: I have set up a short questionnaire consisting of 7 items (X = 7), and the main goal is to find underlying components. I do now, 7 items already is not much, but ignore this fact for now ...
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Performing Paired Sample t-test on sampled height measurements when using different platform sensors?

I’ll be upfront, my Achilles’ heel is understanding how to apply statistics. I want to test/compare the relative accuracy of sampled height points created at set intervals (say 50 metres) along a 1 ...
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interpreting within group correlation magnitude (Multilevel Modelling)

I am trying to get a basic understanding of how to interpret the magnitude of within group correlations- and whether the general rule of weak (.2 to .4), moderate (.4 to .6), strong (.6 to .8) and ...
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Should I use a mixed model and if so which types?

My research question: How is percent cover changing in each transect over time? The data was collected on the same 3 quadrats on each of 6 transects of different locations over 6 years, so must use a ...
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Multivariate Linear Mixed Model with Categorical Predictors? Or MANOVA?

We would like to analyse two continuous reaction measures in a multivariate model using only categorical predictors and are looking for the best model to do it. We are using R, and have not yet seen ...
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Question about Within Subjects V.S. Between Subjects

What are two advantages and two disadvantages of within-subjects designs (designs with repeated measures) in comparison with between-subjects designs?
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Evaluating rate of change in repeated measure on an outcome

Here is a brief description of my problem set up. Retrospective observational cohort of people seen in the ED with pneumonia. Index day or start time is day disease diagnosed. Independent variable is ...
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Mixed model for detecting change in response measurement

I have a dataset where each patient has a baseline measurement (taken at time $t=0$) and somewhere between $1$ and $8$ additional follow up measurements. I am interested to see whether some other ...
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What statistical test to conduct?

We conducted an intervention study (digital intervention) to understand the change in knowledge and various psychological variables (likert scale -- attitudes, beliefs, anxiety) on a group. We first ...
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Using Generalized Mixed Models In R

I'm trying to run a logistic regression but for a within-subject design so I ended up using a genearlized mixed model (glmer and lme functions in R). There is one predictor (with 3 conditions) and a ...
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Repeated Measure (Within-Subject Design) with Categorical Dependent Variable

I've made a study using a within-subject participant design. There are 3 conditions that each participant sees (2 stimuli per condition) and the dependent variables are one of four categorical options ...
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Is it okay to use ANCOVA to show something is correlated to A but not to B?

I did a study to look for a neural correlate to a behavioral performance score, say scoreA. scoreA is obtained in a behavioral test. At the same time, scoreB is also obtained, though I don't care ...
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What are the statistical drawbacks of my naive and simple approach to discarding outliers?

I'm trying to measure and compare the performance of some computer programs. The simplest idea that comes to mind is to time, say, 10 runs in a row and present the arithmetic mean of the 10 timings as ...
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ANOVA vs. t-tests (yet again)

I am aware that there are many questions on this site with basically the exact same title. I have read them all and still want to formulate my question as follows: I am trying to understand the ...
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A basic question regarding mixed-models (study design and code provided)

Maybe this is too simple a question, but imagine in a 3-wave, longitudinal study, two therapists both get to deliver the treatment and the control arms of the study ...
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Justifying terms taken as random at different levels in a mixed-model in R (study design and code provided)

I'm following up on this question. In short, imagine in a 3-wave, longitudinal study, two therapists both get to deliver the treatment and the control arms of the study to a different set of subjects (...
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Anova vs wilcoxon

I have collected data of 73 patients with tinnitus where 45 have received a cochlear implant (therapy 1) and 28 have received a hearing aid (therapy 2). To research the impact of these two therapies ...
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Measuring a parameter in a changing attachment probability of an urn model given the draw sequence

I want to find a way of measuring a parameter in a changing attachment probability of an urn model given the draw sequence. I hope this is the right place to ask these kind of questions, I apologize ...
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Follow-up: Random & Crossed Random-Effects in Model Syntax in R (lme4)

I'm following up on this question and this answer. The answer mentions that without having a clear study design, understanding whether the random-effects specified in an ...
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Cumulative predictors in longitudinal mixed-effects models

I am conducting an mixed effects for repeated measures regression where I want to estimate the effect of a pharmacological treatment and therapy on severity of mental health symptoms. Participants had ...
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Comparing Time Series temperature data to determine similarity between two subjects (ANOVA, Python)

I hope that you can assist me with the following question on data post-processing and analysis! Background: I have over 600 .csv files which contain temperature data vs. time, measured from one ...
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Random effects structure using glmer: need for a nested structure?

I am analyzing data from a field experiment looking at the effect of different plant species (“treatment” with 6 levels) on pollinator visits (“visits”=response variable). The experiment is a ...

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