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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Sex, Dose, and Repeated Measures Analysis

I am testing the hypothesis that male and female have a different timeline of withdrawal behavior, such that either males or females experience greater withdrawal symptoms from morphine across 12-24-...
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lme4: glmer() warning messages with count data mixed-effects model and how to proceed with model fit

I have fitted a GLMM with the function glmer of lme4 package. My data consists of a repeated measures count variable, which I am trying to explain with a continuous variable (week) and some ...
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The use of the index argument in glmmlasso in R with interaction terms

I am using the glmmLasso package in R for variable selection with repeated measurements. I have 14 variables + interactions of each of these 14 variables with age that I want to use the selection for. ...
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Help me compare the allocation of points, repeated measures, within subjects

In my hypothetical study, I'm interested in having the same 150 people pretend to spend 100 dollars on four items (let's say: apples, oranges, bananas and pears). Each item costs 1 dollar. Each person ...
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Can a mixed model random slope include a between-subjects factor in a repeated measures design?

I'm after some statistics help with generalised linear mixed models. I have built a model using glmer from the lmerTest package in R to fit my data with a gamma distribution. The formula is as follows:...
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Analysis on repeated measurements with only one follow-up outcome

I would like to analyze the association between dietary intake and a specific health outcome. Now suppose I have 100 subjects, each having 10 repeated measurements of dietary intake collected from the ...
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Test for non-parametric repeated measures for replicated block data

I asked 133 students to rate 12 audio-samples (on a hedonic scale from 1 to 9): 4 of those samples were generated by myself (human), 4 of those by an algorithm (machine), 4 of those are random ...
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Correcting repeated measures data to display error bars that show within-subjects differences

I have some data containing within-subjects observations for two factors: y as a function of timepoint (300 'levels') and ...
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Unconditional Multilevel model for repeated measures data using lme4 in R

I have a data frame with post and follow-up measurements for approximately 200 people. In the study, we try to find out if there is a correlation between sports participation and distress symptoms. We ...
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Are my data paired or not paired for a t-test?

I am analyzing data where my experimental design is as follows: DNA and RNA samples were taken from 3 mesocosms at seven time points across the duration of the study to see DNA and RNA decay across ...
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Nuisance variable in a repeated-measures one-way ANOVA

I need to perform a one-way repeated measures ANVOA, while accounting for a nuisance covariate that is hypothesized to confound by dependent measure. For each subject I have one value of the dependent ...
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How to compare subjects/groups with multiple variables which have multiple values?

I would like to get an opinion about comparing groups of subjects that have multiple variables multiple times. I have three groups (A,B,C) divided by their age. Each group has a different number of ...
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Nested Individuals within a group - meaning?

I am reading "DID Intro" by Stata Corp LLC. It is recently updated, early April 2022. On page 7, it explains how Stata runs a panel-data difference-in-differences regression. My question is ...
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Which tests to run for a population repeatedly measured both before and after a treatment?

I have an experiment with 10 environmental plots that will be measured for CO2 output daily for 3 months. At about halfway through the experiment a treatment will occur to 5 of the plots. After the ...
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repeated ANOVA in R and JASP

I I have calculated an ANOVA for my project. First in R and then with JASP. On the pictures you can see the respective output of R and JASP. My professor says that the outputs are the same but I don't ...
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2-Way RM ANOVA as a linear mixed effects model

I'm attempting to learn how to run repeated measures ANOVA as a linear mixed effects model. If I run a standard ANOVA, the results are different from if I use lme. <...
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Longitudinal analysis with different baseline value for the groups

We have four mice groups and each mouse had to find a platform in a pool in this experiment. On D14 (the first day) they did this task for the first time and the latency to the platform (time to find ...
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Logistic regression with counts over sliding windows of time

I am working on a logistic regression model that attempts to predict failure events in the following year over a lot of devices (say 1000) using the previous number of minor incidents that happen in ...
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Compare within subject variation between groups

I have run two experiments (exp). In each experiment, we have measured the same property in a number of subjects twice (V1 and V2). The number of subjects are different in the two experiments. and the ...
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Test two samples with correlated observations within sample

I have repeated observations from individuals that have been randomly assigned to either Group 1 or Group 2. In detail, 64 subjects were randomly assigned to one of the two groups and performed a task ...
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Doing repeated measure with blocking design

for this study which analysis do you suggest? repeated measure or blocking design? I have 6 subject, to compare effect of a drug administered in four dose levels. Dose 0 we used control. two days wash ...
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Help finding the right test

I am running an experiment and now it is time to do some analysis, but I am having a hard time figuring out the right way to analyze my data. I have a number of questions, but first let me give you ...
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Linear Mixed Model: Repeated Measures on two levels

I have an experiment with nested repeated measures. Specifcally 3 repeated Rides with 21 participants, with 3 sequential Measurement-Intervals per ride. I am interested in the effect of the ride ...
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Repeated Measure ANOVA in R?

I am trying to run stats on work information and I am hoping for some help. I currently have a project with just a control, and one treatment that is replicated throughout a block. I am wanting to see ...
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Predicting an interaction between a covariate and an IV in a fully within-subjects design

My design is 2x2 repeated measures ancova, and I'm predicting an interaction between one of my within subjects independent variables (IV) and a fixed covariate (CV). My question is what this means for ...
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Fitting a model for data with repeated measure in R

I have below model with repeated measure library(gee) data(warpbreaks) head(warpbreaks) summary(gee('breaks ~ tension + wool', id=wool, data=warpbreaks)) However ...
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What to use for nested subjects with repeated measures, ANCOVA or LME or even SEM?

I have a dataset like: I grouped the subjects based on their initial depressive mood (first step (pre-treatment) of repeated measures level) as 1 low, 2 high. I have two conditions (1 control, 2 ...
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Linear mixed model with outcome measured just once, using nlme in R

I've got repeated measurements data on a continuous, time-varying exposure and a continuous outcome. The exposure was measured 1-...
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Which mixed model in lme4 best mimics the unstructured covariance in GLS?

I have longitudinal study to analyse. M patients examined at N time points. I want to run a marginal model via GLS estimation with unstructured residual covariance. But I want also to apply the ...
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MMRM structure in R for time series data with interaction terms

I'm trying to simulate some clinical trial data where the exact structure of an MMRMs have not been provided, however, it is known that the general structure is as shown below. In one iteration a ...
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Missing R Squared and ICC for Multilevel Binary Logistic Regression

I am currently assessing if allocation to a rejection scenario and degree of negative beliefs predicts the odds of engaging in a series of behavioural outcomes (e.g. avoiding the person). My first IV (...
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Adjust outcome variable values dependent on a factor

I am running an longitudinal study on electricity consumption. I test the effect of 3 interventions on DV consumption in kWhs. For the interventions, I have a categorial dummy var with 3 levels. I run ...
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Advice on use of survival vs logistic model

I have a longitudinal dataset from a medical registry where every subject has a certain medical condition. Periodically, each subject is checked for a specific outcome (yes, no) of interest. I have ...
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Classification of Repeated Measurement data

I am currently working with sensor data (sensor response from object gas at different temperatures at different time points) that has 1200 features (independent measurements) and one response variable ...
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Is Homicide Victims dataset repeated?

I am studying an example where a Poisson model is applied to the Homicide Victims dataset. The dataset contains survey results of 1308 people who where asked about the number of homicide victims they ...
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How should I conduct repeated ANOVA if I have multipe group within a person?

I have dataset like follows: In this case, I want to compare the mean difference between A, B, C. Should I conduct repeated ANOVA? ...
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Parametric and non-parametric statistical test for between groups differences in means with "repeated measures"

I am trying to understand the appropriate statistical tests for the following experiment: I have 3 different groups consisting of 5 individuals per group (each individual is a member of only a single ...
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Test-retest reliability for a test taken twice but with a variable delay between tests

I have a dataset that is composed of a few thousand datapoints, each of which consists of two test results for a participant that were collected when they underwent the test at Time A and Time B. The ...
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Modifying covariance structure in statsmodels mixedLM

I am using the following command to fit a linear mixed model for repeated measures (MMRM) in statsmodels: ...
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polynomial contrasts mixed model with repeated measures

I'm trying to compute a mixed design with an multilevel approach in R. I'm quite new to the game and really hope someone can help me here. What I have is a group of people measured 10 times (in 10 ...
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2x2 Repeated measures ANOVA gives DIFFERENT result in R and SPSS? (Same type of sums/data/analysis) Anyone know why?

Reposting this because I fixed the formatting to see if someone can actually provide a solution for this problem. I have a study design in which I am carrying out a 2x2 repeated measures ANOVA in ...
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Surveying mostly the same population over time: t test appropriate?

I'm looking to run a satisfaction survey on a population of about 100 subjects. My response rate is about 70%, and I plan to survey repeatedly, once a month, for a year. How can I test statistical ...
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How to obtain contrasts for constrained longitudinal data analysis?

I would like to apply a constrained longitudinal data analysis (cLDA) with a linear response variable of the form, y ~ Time + Treatment:Time + (1 | ID). I am using &...
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Would i do a mixed model MANOVA, a one factor MANOVA followed by individual MANOVAs?

Ive been trying to learn about MANOVAs and cannot seem to find examples relatable to my data, or I am not understanding the language being used to teach the concepts. I have stable isotope data which ...
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What post hoc to use after finding significant main effects and simple interactions in a GLMM?

I have a experiment with multiple nominal and ordinal variables of interest ($7\times4\times3\times2$) as well as 3 nominal nuisance variables ($2\times2\times2$). The one outcome variable is binary: ...
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Mixed-model with 2x2 manipulation and pre-post-measures

I have a data set from 112 participants who were split into 4 groups based on the manipulation 2(cond1 vs cond2) x 2(cond1 vs cond2). We measured their salivary cortisol pre- and post-manipulation. I ...
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Correlation analysis for repeated measures categorical data

I'm confused about the correct way to deal with my data. They are structured as follows: and here is a sample: ...
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One-way repeated measures MANOVA in Python

I was wondering if it is possible to do a one-way repeated measures multivariate analysis of variance in Python? Sadly, I can only find explanations for repeated measure ANOVAs online. I have 1 ...
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Do Eta Squared and Partial Eta Squared Coincide in One-Way Repeated-Measures ANOVA?

In one-way anova, do eta squared and partial eta squared always coincide, both in between- and within-subjects designs, i.e. both in independent and repeated measures designs? I have been discussing ...
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A terminology related to within-subject/between-subject design

I want to ask the terminology for this method: "I have run a survey with many respondents. There was a pool of questions, and each respondent was asked 3 of the questions (chosen uniformly at ...
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