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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R - Model specification for repeated measures in linear mixed-effect model (lmer)

I am quite new in linear mixed-effects models, and trying to figure out how to properly design my model according to what I want to show (especially with the nesting and random effect). I am reading ...
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repeated measures PERMANOVA nowhere to find

the internet seems full of people looking for a way to account for non-independence of samples when using the PERMANOVA method as implemented in the functions adonis...
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Power analysis and sample size for multilevel modeling growth curve (repeated measures)

I am aware that there are some useful threads already on free software for calculating sample sizes (see here). However I couldn't find anything specific to cross-classified MLM and repeated measures. ...
2 votes
2 answers
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What should be normally distributed for a two-way repeated measures ANOVA? R

When running a two-way repeated measures ANOVA, should: A) the independent varibles be normally distributed? B) should the scores between the variables be normally distributed? Overall: should the ...
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Using Binomial Cumulative Distribution Function to Analyse Repeated Measures Design

I performed an experiment in which a group of $N=42$ participants performed a task under three different sound conditions. My data meets all the requirements for a RANOVA which confirmed that the ...
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How to specify a repeated measure in a Mixed Effect ANOVA?

I am trying to run a Repeated Measures Mixed Effect ANOVA in R. However, the syntax of the code is really tricky and it seems like there is not a lot of clarity on how to run it as I do my research. ...
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Testing association in repeated measures with zero in contingency table

I have a small dataset of repeated measures data (each participant (id) has up to two samples taken) and would like to determine if there is an association between ...
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3 votes
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What kind of study design is this and what kind of statistical analysis should be suitable?

I plan to conduct a study in which respondents will be asked to solve total 6 puzzles together. Is there a specific study design (name) for this? The scenario would be: First, ...
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1 vote
2 answers
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How to test whether there is a significant (general) within group trend with data from many groups

I am having trouble identifying the correct statistical method for the following problem: I have data on a characteristic (e.g. body length) from several individuals per species, distributed in an ...
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What regression/analysis should i do for the following case?

I am analyzing a survey where I check for the importance that certain variables have in the referral decision making of individuals in the workplace. In the survey I have one normal scenario and two ...
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1 answer
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First test nonsignificant; second test significant. Do I need to include repeated testing as a factor in ANOVA?

I am running a repeated measures ANOVA for my data set. Our rats completed 8 training sessions in 2 conditions (within-subjects; 16 sessions total). Then they completed a test - the same test in each ...
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Calculate interaction standard error for a 2x2 within-subjects design

I'm conducting a meta-analysis and I'm trying to calculate some missing information to calculate relevant measures. Assuming that I have a 2x2 within-subject design (factor A two levels and factor B 2 ...
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How to incorporate repeated measures (pre and post experimental conditions) into three-way ANOVA?

I'm analysing data from an experiment I conducted last year with one treatment group and one control group, each imposed on two plant varieties in five pot sizes. I took two measurements from each ...
4 votes
1 answer
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how to analyse a dataset with both repeated measures and independent measures

I am doing a research project looking at the impact of noise on fish behaviour. I have two experimental groups, with one doing a task in the control (silence) condition and the other doing it under ...
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Multiple comparison correction for 20 Likert items questions

I have an experiment where participants try a system then answer 20 Likert-item questions and then try a second system and answer the same questions again. One system servers as the baseline the other ...
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Is a linear mixed-effect model the correct approach?

I conducted a crossover study where 10 subjects performed tasks using two different methods (A and B) based on different conditions. 5 of the subjects started with method A and 5 subjects started with ...
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Which is the best approacho to analize repeated measures of categorical data?

I have the results of an experiment done on 60 individuals (n=60). The experiment was divided into four stages and after each one, we did a set of measurements of each individual and we assigned the ...
0 votes
1 answer
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Chi-squared for repeated measures for 2 by n

I have data on patients who have two gastric samples drawn to culture bacteria. I would like to see if gastric pH (categorized as acidic, neutral, or basic) has an influence on the dichotomous outcome ...
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2 votes
2 answers
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Specify an lmer model for fully crossed data with replications

I have experiment data with multiple independent variables: shape - 2 factors color - 2 factors ...
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1 answer
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permutation tests of group differences when data contain repeated measures

I have data from several mice with id id. Each mouse either belongs to either group C or group ...
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Getting trustworthy results from small samples and small population

I am an undergraduate student of psychology from Indonesia. Right now I am doing a mini research project where I correlate geographical data to outcomes at the provincial level. The hypotheses is that ...
3 votes
1 answer
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Permutations with repeated measures

Let's say I have data from several mice with id id. Each mouse wandered around two mazes (A and ...
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Analysis of a repeated measures data (longitudinal)? LMER package in R

I have two groups (A and B, with 23 non-overlapping subjects in each group). Each of these groups underwent a different treatment. My two main variables of interest are V1 (continuous physiological ...
2 votes
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Using multilevel modeling to test differences in the ability of trait and state measures to predict outcomes

I'm currently trying to test whether trait is better at predicting overall/mean job performance than state anxiety and whether state anxiety is better at predicting daily job performance than trait ...
1 vote
1 answer
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What is the difference between Partial Eta Squared and Partial R Squared in factorial repeated ANOVA?

I carried out an repeated measures ANOVA in SPSS with two within subjects predictors, and requested for measures of effect size. SPSS provides partial Eta Squared as a measure of effect size, but I ...
2 votes
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How to distinguish between measurement error and within-person variability in multilevel modeling/HLM

I'm currently running a model to determine if people vary in their daily levels of variable Y, and if daily levels of variable X predict daily levels of variable Y. I collected measurements of both X ...
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When one out of two moderators is non-significant in an additive moderation model, does it make sense to keep it? [duplicate]

based on a within-subjects design I am looking at the effect of three different products (X) shown to each participant and their product perceptions (Y) while controlling for two moderators ...
3 votes
0 answers
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How are repeating dependent variable in long-data format affect outcomes in mixed effects linear regression models [closed]

My question is about the mixed effects linear regression analysis (i.e. lme4 or brms libraries in R) using long data format in R. How does brms analyze the data where the dependent variable repeats ...
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Is it better to use mean values from measurements or measurements themselves in the ML model?

I have a following problem that I am not sure how to tackle. I did a number of experiments and measured values of dependent parameter Y. I had 3 independent parameters X1-X3 each with a different ...
1 vote
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Linear mixed model with repeated measures at two timescales

I want to use a Linear Mixed Model on the following design: 20 subjects with one between-subjects factor (10 males, 10 females). Each subject is measured at 4 timepoints: At 0 weeks, 2 weeks, 4 ...
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LMER returns errors, but Repeated Measures ANOVA on the same data doesn't, why?

everyone! So, I've been trying to fit a LMER for my data, which I fully described in this post . This post, therefore, is a follow-up from the previous one. There's something intriguing me, I don't ...
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Significant interaction in repeated measures ANOVA becomes insignificant with a covariate (SPSS)

I'm finishing my masters' project and have some results that are confusing me! I ran a repeated measures anova as 2 (valence - neutral or negative) x 4 (Task 1-4) This showed a positive main effect of ...
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2 answers
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Which test to use that includes repeated measures (pre and post) but also different treatments?

Currently looking at data in which each participant recorded their level of pain from 1-10 in terms of severity for both pre and post operation, for 3 different treatments. Such as the table below, ...
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1 vote
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What kind of transformation should I do to improve my linear mixed model?

I had asked in a previous post how to check the validity conditions of a linear mixed model I made, and here is the link After additional diagnostics I have the impression that the distribution of the ...
1 vote
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How to assess whether study strategy affects slope of repeated measurements?

I wish to assess the effect of teaching strategy on improvement in grades (slope). For this, I plan to conduct a study where students will be assigned different teaching strategies for their tests. ...
4 votes
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Confused about the correct model specification given the study design (fully-crossed factors with nested repeated measures)

THE ISSUE Apologies in advance, being primarily a biologist and only tangentially a statistician I hesitate to ask this question for fear of overly complicating a simple situation. That said, I have ...
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Using mixed models on SPSS for multiple observation per subject across time

It's my first question here and I'm french-speaking so bear with me, I'll try to make this as clear as possible =). I am unsure how to construct my database and how write my syntax (in SPSS) to test a ...
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Non-parametric equivalent of two-way repeated measures nested ANOVA

I have read the closest answers to my case in this forum and everywhere else, but still remain unclear about the best course of action. I am trying to analyze transect data from multiple locations to ...
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MCMC model: how to study the influence of personality (repeated measures) on a trait

I am trying to investigate how frogs level of aggressiveness influence their plastic responses to a more or less big opponent. To do so, I presented an individual with a simulated opponent, ...
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1 answer
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Regression on longitudinal data with varying observations times

I have a question about performing regression for prediction on a continuous dependent variable that is time dependent. The table below shows an hypothetical structure of my data. I want to estimate ...
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Binary Classification using Machine Learning Models for longitudinal data in R

So I have longitudinal data with a binary target variable, and I'd like to perform binary classification using a random forest, xgboost, and glmnet (ridge/lasso/elastic net) model. Is this possible to ...
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Mixed ANCOVA SPSS Interpretation

Before I ask my query I need to explain some basic details with respect to my study. Design: I have a mixed factorial design 2X2x2 with two within subject factors (having 2 levels in each factors) and ...
1 vote
1 answer
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Repeated measures ANCOVA interpretation – significant covariate/test day interaction

I am in the last phases of my master’s thesis, and came across a question regarding my data analysis results that I cannot seem to find a clear answer for. For context, my data is from a randomised, ...
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1 answer
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Need equality of variance test between control and experimental conditions on a within subjects with replication dataset

I have some proteomics data of 16 biological replicate samples split between 8 control and 8 knockdown. One of the tests I wanted to do was to see if the knockdown impacts the variance of the protein ...
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Do there exist welch's repeated measures anova/ancova/manova?

Do there exist welch's repeated measures anova,ancova for unequal variances or does one have to run a mixed-effects regression or friedman test? Is it possible to generalize this methodology to ...
1 vote
1 answer
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One sample t-test equivalent for repeated measures design

I might be looking for something fairly obvious but here is my setup: I have one group of participants who will perform multiple (different) tasks in an experiment. For each one of the tasks, I want ...
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Repeated Measures Linear Mixed Model - How to treat time when time is not a variable of interest

I have a hierarchical data and I would like to analyze it with a repeated measure mixed model in SPSS. My data is coming from 90 different fields for 15 years annually. In SPSS, I included the field ...
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What does it mean when in a mixed design the "within" subjects is significant only when the "between*within" interaction is excluded from the model?

I have a mixed-design, 1 between (group A and group B) and one within (pre and post). Anova, as well as mixed-effects model, showed non-significant results in the between, in the within, nor in their ...
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Double-count in Poisson Regression (SAS) for repeated measurement?

my team is working on a project about covid incidence in elderly nursing home in a particular state. We tried using proc genmod in SAS with link=log and dist=poisson to calculate the incidence but it ...
1 vote
1 answer
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Which non parametric test can be used for multiple repeated measures at the same site?

I have repeated monthly measurements of some variable at several different sites, so that I have 21 data points (21 months) for each site. Now, I want to see if there are significant seasonal ...
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