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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Adding repeated measures to a mixed model with lots of NA's

Summary of my dataset. I've got islands on a river. Over the last few years, they've received one of three management actions, maybe two at once, in a year. 0 or 1. My response variable is the ...
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Linear Mixed Models for Variance in Repeat Measurements

I am measuring blood pressure in patients and controls. Two measurements of blood pressure are taken on two different days (for a total of 4 measurements). I would like to be able determine what is ...
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Covariate on a MANOVA mixed-effects model

I have a 2(condition) x 3(group) mixed-design study. I’m interested in the effect of a continuous time-constant covariate (i.e., a unique value for each subject, similar to age) on the interaction (...
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PROC GENMOD Repeated Measures in SAS [closed]

I'm trying to run an analysis on a repeated measures anova. The study was nine months of data. Four treatments was applied to 3 separate blocks and the result is average cover of native plant species. ...
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ROC for a family of repeated experiments

Suppose I have a continuous covariate like age, and I want to use it for RNA expression which means that I have to fit a large number of linear models, one per gene, that predict the expression. ...
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Comparison between 2 conditions with repeated measures

I am working on an experiment which took place during 12 months, during which the same specimens underwent periods in so-called "optimal" conditions (months 1, 3, 4, 5, 6, 10, 11 and 12) and periods ...
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GLMER Model Failed to Converge: Convergence code 0 unable to evaluate scaled gradient

I'm attempting to perform univariate mixed-models logistic regression. Data: https://pastebin.com/dkwLzRka Here we have multiple observations of a given individual. The outcome is binary, and the ...
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Resample / restructure within-subject comparisons to save computational power

I want to calculate several "comparison scores" between biometric data of several subjects. I just want to compare each biometric sample within a subject to each other (no comparisons across subjects)....
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Repeated measures ANOVA for equality of two measure

I have used two different designs for a questionnaire to measure the same variable, and I want to investigate if changing the design led to a different measurement as a result. I have a within-...
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R: Mixed ANOVA works with the aov{stats} function and fails with the anova_test{rstatix} function. Why?

I can implement a rather complicated mixed ANOVA in R with the aov{stats} or the lmer{lme4} functions, but not with the anova_test{rstatix} nor the Anova{car} functions. My question follows: How can I ...
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Generating a full rank model matrix in R

For a particular tool I need a model matrix which allows me to build desired contrasts and which is a full rank, i.e. no columns are linear combinations of other columns. The experimental design ...
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conceptual model and mixed anova

I am doing a research about the influence of a food label on Perceived Healthfulness of a product. My independent variable is Label (absent/present) and my dependent variabel is Perceived ...
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Specifying the random effect for repeated measures mixed model

I have two treatment plots: impact and control these treatments were sampled over 5 different time periods: T0, T1, T2, T3, T4 Within these plots: 4 replicates were taken for the control and 9 ...
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Problem with repeated measures GLMM in SPSS for psycholinguistic study : Failure to converge and SPSS runs forever

I'm trying to run a generalized linear mixed model in SPSS, with a continuous response variable (ResponseTime), SubjectID as a random factor, Items as a repeated measure, and five fixed factors: three ...
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mixed model with repeated measures in R

I have a crossed design with 2 levels of Trt1 fully crossed with 5 levels of Trt2. This same design is applied at 10 different locations. Now the samples are collected from the same subjects at 6 ...
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A mixed two way repeated measures ANOVA post hoc

I am measuring the difference between two questionnaires (one before a distraction task and another after) between two different conditions (talking vs not talking). I have conducted a mixed repeated ...
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Mixed model with first and second levels nested, but crossed higher levels

I'm having trouble figuring out the equation of a mixed model I'm trying to estimate. For beginning, I have data collected for several municipalities and banking institutions over the years. In the ...
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How many days should I measure a variable to get a good estimate of 'average' behavior?

I have data for individuals, spread over a number of days. My dataset is very large: it covers way more days than what is typically feasible to collect. I want to use this to create a 'benchmark' of ...
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Friedman test: non-significant post hoc (exact and Nemenyi test) should I run Wilcoxon signed rank tests or Sign tests? Or just accept the results…?

In my data, participants were tested on the same ordinal variable 3 times. In order to test for within-group differences, I ran a Friedman test. After reading this post, I ran the friedmanTest ...
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When comparing groups of subjects with within-subjects repeated measures, is it appropriate to use the per-group observations directly?

I'd like to show a summary figure comparing two groups. Within each group, each individual responded to multiple independent trials. As an example: ...
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Significant effect with overlapping boxplots?

I'm puzzled about some of the results that I got, after plotting the data. I have a dataset where 38 participants are tested on three conditions "time" and are thus tested three times. I figured this ...
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Implementation and interpretation of time-varying covariates/predictors and their interaction with time in linear mixed effects model

I have a longitudinal design, where we are interested in the relationship between clinical symptoms (continuous data) and brain data (also continuous) both measured over two timepoints. As we have a ...
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Comparing the before and after scores between two groups

In this experiment I'm trying to make, one group of people watches a lecture series and one does not. Before the lecture series, both groups' levels of optimism, knowledge, and anxiety are assessed. ...
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Syntax for repeated measures, nested, mixed effects model using lmer()?

I'm trying to analyze temporal trends in a community of amphibians and looking to see what variables may be important in understanding declines. My response is a single vector of ln transformed ...
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28 views

Linear mixed model right?

I was wondering if a linear mixed model is appropriate for my data. It looks like this: ...
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Can a repeated measures ANOVA be applied to non-time-series data?

Good Evening :) I am currently analysing data in which I have thickness measurements for different subfields of the same tissue at one timepoint. So basically my data looks like this: ...
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Mann-Whitney with repeated measures on only *some* participants

I've been working on the stats for a paper which involves comparison of various pairs of groups on a particular score that is heavily skewed (and so I don't feel it would be well suited to comparison ...
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How to analyse Likert Scale with multiple product evaluations?

I'm getting lost on how to analyze my data. I've looked through many of the Likert data threads but couldn't find answer to my specific problem. So I'm desperately asking for help here. The objective ...
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Interaction within*between in mixed models: slope of the within factor as random or not?

I am struggling with conceptual understanding and analytical choice in mixed models. In a within-subject experiment (2 conditions, factor X), I want to test if the effect of the condition on the ...
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Can I use Binary Logistic Regression (odds ratio) in longitudinal studies for the tracking (stability) analysis?

Can I use Binary Logistic Regression (odds ratio) in longitudinal studies to check the tracking (stability) of a variable? Is there any advantage to using Generalized Estimating Equations (GEE) or ...
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Repeated measures with 2 timepoints

I am collecting data where phenotypes are measured at 2 timepoints for multiple individuals. I know that I can use mixed models with a individual-specific random effect to identify if a phenotype ...
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Repeated measures anova in R: comparing each month against itself across a ten year period

I am an R novice and trying to perform a repeated measures anova to compare each month against the same month across all 10 years (e.g. Jan 2010, Jan 2011, Jan 2012 and so on... for each month). And ...
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Follow up Repeated Measures ANOVA with paired t-test?

I have conducted a repeated measures ANOVA with 2 between subject factors and one within subject factor. The within subject factor is trust in politicians. Trust in politicians is the dependant ...
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Can I use the early response to a treatment to predict the full effect? - Dealing with regression towards the mean

Suppose I have a 6 week weight-loss program, that I know is only effective in a fraction of the population. I weight the participants at baseline, after 1 week and after the full 6 weeks. $$ T_0 = ...
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Can I use two factor repeated measures ANOVA?

I have 10 participants that undergo Treatment 1 and another 10 participants that undergo Treatment 2. All 20 participants are being measured twice on their blood oxygen saturation. Once BEFORE the ...
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Two-way or three way repeated measures ANOVA with replicates

I have tried to read some papers about two-way ANOVA and repeated measures ANOVA but I just get more confused the more I read. I have a BACI study design where I have investigated 12 stations. I have ...
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Interpreting repeated-measures oneway ANCOVA

I have a question on how to run a repeated-measures oneway ANCOVA. I have only one within-subjects factor (time) and I am interested in how a construct changes from T1 to T2. I would also like to add ...
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How exactly should repeated measures situation be treated in machine learning models?

I was reading this SE about repeated measures and I was a little bit confused. I have a data set consisting of claim information for million locations for up to 5 years and 99.9% of the observations ...
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Using Repeated Measures ANOVA when the treatment and control only occur at the start (and not later in the study)?

Is it appropriate to use repeated measures ANOVA in cases where we apply a treatment at some time and then monitor how the subject respond over 2 or more time periods? E.g., I have a medication that ...
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How do I interpret the regression coefficients when making comparisons between the change of slope between control and disease?

I have 15 genes and two groups (58 control and 51 disease). I have relative abundances of the genes at two time points (time point 1 and a few years later time point 2, the average age difference is 4....
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How can I analyse several ordinal dependent variables across multiple time points?

So, I have several ordinal scales that have been administered to the same sample at three different time points and each is being treated as separate dependent variable. I can't run a repeated ...
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Two way or One way repeated measures Anova

I want to examine the effect of gender on running conditions. There are 4 running conditions including baseline and i want to see if there is a significant difference between genders across these ...
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R - Formulating repeated measures logistic regression

I have a basic knowledge of statistics and very new to the realm of mixed models. I'm working with some longitudinal repeated measures data (4 time points) and am trying to properly set up my model in ...
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18 views

Specifying a linear mixed effects model for two-way repeated measures data

I am trying to figure out how to specify a linear mixed model in either Python or MATLAB (I don't have any experience with R, unfortunately). My data consists of the following: Three continuous ...
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Linear model equivalents of classic within subject tests

I'm trying to build a broader understanding of linear models in the context of A/B testing. The situations I'm usually dealing with involve categorical within subject factors and testing if they have ...
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How can I predict a single binary outcome with multiple repeated measures?

I am using SPSS 25. I want to predict the probability of a binary outcome (DV): pass or fail a test at the end of “this” school year. My independent variables are Test status (pass/fail) at the end ...
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Can I use repeated measures ANOVA on small sample size (n=14)?

The data I'm trying to analyze is of a single arm, repeated measures measurements (n=14). Obviously, it it difficult to assume normality on such a small dataset. When running Shapiro-Wilk test, 40% of ...
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Properly accounting for quadratic time term in repeated measures

I am trying to fit a repeated measures model (random intercept) of the form Score = Time + Treatment + Time * Treatment + (1|Subject). The Time * Treatment term is what I am interested in. I want to ...
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Expected values of the mean squares of the pure error and lack of fit error

I know what pure error and lack of fit error are. I also know that their mean square is their squared sums divided by their degrees of freedom. But then how do we derive the expected values of these ...
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Do I have a true within-subject design?

I am currently in the design phase for an experiment on different packaging attributes and their effects on an actual purchasing choice. In this context, I am asking myself a possibly trivial question:...

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