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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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2 way ANOVA one repeated measures factor and percentages

We're investigating the effect of two different types of feedback on motor learning. We have two groups that performed 4 different tests and we'd like to see whether an interaction between these ...
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Analysis crossover clinical trial

I have data from a six-sequence 3-drug 3-phase crossover trial that had a 7-day baseline period pre-study (used to generate mean baseline value). My outcome is a non-parametric continuous variable ...
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Repeated measure anova (RANOVA) in R [on hold]

How to perform repeated measure anova in R?
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Repeated measures anova: lm vs lmer

I'm trying to reproduce several interaction test between with both lm and lmer on repeated measures (2x2x2). The reason I want ...
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Syntax differences between aov and lmer for two-way repeated measures design

I'm working with the following data frame using R. It consists of measurements obtained from 7 subjects with two independent variables (IV1 and ...
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Repeated measures: Use random intercepts model, too many intercepts?

This is a common question, but I couldn't find a question / answer on Cross Validated dealing with the same problem. In short, is 1000 intercepts too many intercepts, that is, can individual be a ...
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Repeated Measures 2 Way Anova with non-normal non-balanced dataset

I'm doing an experiment where I test participants of two groups (experts/non-experts) under two conditions (eyes opened/eyes closed). From these tests I got 11 variables I want to compare between ...
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Repeated-measures anova and linear mixed effects models with nonrandomized data

I have data from 7 subjects (id) who performed 3 trials of each of 2 different kinds of movement (Factor mov) under 2 different ...
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Can I use a fisher's exact test for repeated measures?

I have a set of data working with embryos where I want to compare whether male carriers of a disease have a higher chance of outcome A than female carriers. My first thought was to do a fisher's ...
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Testing interaction of 2 binary variables on a binary outcome with repeated measurement

I have a study with repeated measurement. The outcome was measured at the baseline, prior, and after the baseline (i.e. 3 time points) The variables are as follow: outcome Y: Binary; with ...
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Selecting a Correlation Structure for GEE

I am using Poisson regression with a log link, to estimate Relative Risk and need some guidance on selecting a correlation structure. My observations are courses of antidepressant treatment where a ...
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Variance components model: proportions of within and between variance are off?

I was hoping someone could help me see what I'm obviously missing here. I simulated some clustered data and, in the sense of a variance component model, wanted to take a look at the variances of the ...
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Are these the correct residuals to test for normality for a within-subjects 2-way anova?

I have data of an experiment where subjects performed a task under 4 conditions (A1B1, A1B2, A2B1, A2B2, where A1/A2 are the levels of factor IV1 and B1/B2 those of ...
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How to run a repeated measures ANOVA for randomized groups?

I have read this article in here that talks about RANOVA. As I understand there are two types of study design that can use RANOVA. Studies that investigate either (1) changes in mean scores over ...
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Construction of linear mixed model (using R)

I would like to use Lineal Mixed model to see if the treatments I applied to some soil changed significantly their CO2 fluxes. I have 2 temperature (t1, t2) and 3 inundation (w0,w1,w2), resulting in ...
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Corrected Standard Deviation for Differences in Means

In the published work of Altman and Bland: Statistical Methods For Assessing Agreement Between Two Methods of Clinical Measurement, Lancet 1986 (https://www-users.york.ac.uk/~mb55/meas/ba.pdf) , page ...
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Within-person centering the outcome variable?

What do you think of within-person centering the outcome variable? If my research questions is clearly about within-person effects (in a longitudinal multilevel model), can I just use the centered ...
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Compare variance of 2 groups with repeated measures

Lets say participants are assigned to either an easy group or a hard group. They perform multiple trials of a computer task and reaction time (RT) is measured for each trial. The data looks something ...
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ANOVA with Error term

I am looking for help to create a model for the following data: I'd like to understand if the abundance of a certain microbial group (dependent continuous variable QUANTITY) found in soils is been ...
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The function of TIME in longitudinal MLM

I am conducting longitudinal multilevel models with Daily observations as level-1 variable and PARTICIPANT as level-2 variable. Predictors and outcome variables are measured every day. I am confused ...
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Difference between MANCOVA and multiple ANCOVAs

I am analyzing the volumes of 13 different regions in the brain in a longitudinal (baseline and followup) study. I have two groups of participants - the therapy group and control group, and two time ...
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1answer
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Repeated measures regression using GLMM if there are varying numbers of measurements per subject

Aim: To develop a predictive model for an infection, judged condition negative/positive by an assumed gold-standard. Data: Longitudinal data for a number of subjects, at each time point comprising a ...
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How should I arrange my data and which appropriate test can I use?

I have conducted an experiment to determine if my treatment affects performance of athletes. Each participant will undergo the control and experimental trial. I measured a few variables: 1) Total ...
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Calculating the correlation of an unbalanced repeated measures data set in python

As mentioned in the title I have an unbalanced repeated measures data set and would like to calculate the correlation of a particular stat with win percentage. The data set is of player performances ...
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How to test whether variability between subjects (repeated measures) is significant or not?

I have resting state fMRI data of 77 subjects. For each subject, there are (let's say) 10 regions of interest, and for each region, 50 measurements (time-series). I am trying to compare the ...
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For repeated-measures ANOVA, is there a benefit to averaging the data of participants?

I'm creating a psychology experiment where participants will all perform the same task in which only one within-subject condition will vary (12°, 28° or 45°). Each condition will be presented 200 ...
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Wilcoxon signed-rank test for paired and repeated measures data

I have a dataset with 45 participants, each with 1-7 datapoints/observations (126 total observations). Each of these observations represents a window of time in which two different methods attempt to ...
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Repeated measures ANOVA in R (split-split-plot design)

I am trying to fit a repeated measures ANOVA from an experiment with a split-split-plot design and several measures over time. The experimental design is as follows: I have 9 blocks in the field. ...
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Within Correlation with ANCOVA or Multiple Regression

i have recently tried to understand a measure for within correlation from the paper (Bland & Altmann, 1995): https://www.bmj.com/content/310/6977/446.full The trouble is, the paper describes ...
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Does the parametric coefficient from GAMM compare patterns between groups over time, or just the means?

I have data consisting of the distance cats travelled each hour, collected over four or five days per cat. The cats were measured in different seasons and I want to know whether the activity of the ...
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Simple trend analysis with unbalanced & short panel data

I have the following (unbalanced) panel data: yearly sustainability ratings (ESG) of ca. 2000 individual firms over a 11-year period. The average observations per firm only covers 5.3 periods. These ...
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Multilevel generalized linear model (MGLM) with rank dependant variable : Specification issues

I am currently trying to estimate a multilevel generalized linear model (MGLM) on rank data using clmm function from "ordinal" R package. My dependant variable is a ranking variable repeatidly ...
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1answer
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Effect of continuous variable with many repeated values on Random Forest

I am trying to build a random forest regression model in R using all continuous panel data. There is a large amount of data relative to the number of predictors. Say 500,000 rows and about 40 ...
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Why use Linear Mixed Models instead of Repetead Measures ANOVA?

Well, here's some background before the question: I have an experiment where I evaluate the heart rate of subjects in 4 different conditions (4 time points). The subjects also answer a psychometric ...
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Which analysis method to use with multiple levels and repeated measures?

I'm fairly new to statistics, I have difficulty to choose which statistical method is needed to answer my research question. In the end I want to see if my analysis method makes a difference or not. ...
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What is repeated measures exactly?

Is repeated measure ( especially the one in spss ) a type of Anova or Regression? Is it alternative for univariate/ mutivariate regression?
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How to calculate significance for an A/B test for average revenue per daily active user over a 1-week test period?

One simple approach is to use "per active day" metrics. e.g. "revenue_per_active_day" . However there is a fundamental flaw with this approach. e.g. during a 7-day period, let's say user 1 is active ...
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Implement repeated measure model Matlab

How to use the fitrm() fuction for the repeated measures class in a within subject experiment? The example (Specify the Within-Subject Hypothesis) confuses me, as I do not have a between subject ...
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Regression: within and between-subject variable interaction

I have a dataset with the following variables, which are measured between subjects (i.e. 1 measurement per individual): ID: subject identifier ...
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Time course experiment with treatment, use two way RM ANOVA with post tests or multiple ttests?

I have time course experiment with time and treatment as variables and want to compare treatment differences at specific time points. Would it be improper to use a unpaired ttest at a specific time ...
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Does it make sense to include a *time-invariant* covariate in a simple pre-post analysis?

Background All participants were subjected to a single intervention and a questionnaire was issued before and after the intervention. This is a simple pre-post design. Question I can analyse these ...
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Two groups but repeated measures across time only for one

I am confuse to find what model do I use. I have two group (A, B) with treatment, A has a treatment in t=0 only, but B has treatment in t=0 , 10 and 20. is-it possible to make one big model (ANOVA; ...
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Comparing regression slopes obtained in the same group at different times

I have a group of participants. I obtain two biological measures at baseline and then take the same two measures again after a period of time has elapse. I wish to determine if the relationship ...
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1answer
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How to deal with unequal variances in repeated measures ANOVA

Angry Birds is a video game in which you fire birds at pigs. A (fabricated) study was set up in which people played Angry Birds and a control game (Tetris) over a two-year period (one year per game). ...
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Analyzing and interpreting main effect in repeated measures ANOVA

Angry Birds is a video game in which you fire birds at pigs. A (fabricated) study was set up in which people played Angry Birds and a control game (Tetris) over a two-year period (one year per game). ...
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1answer
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Calculating normality for a two way ANOVA with repeated measures

I am trying to calculate if my residuals are normally distributed for my two way ANOVA with repeated measures on Rstudio. However, all the tutorials I find seem to specific to one way within ANOVAs ...
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Can planned contrasts in ANOVA be one tailed tests?

I have an experiment with 3 within-subject conditions: A, B and C. My dependent variable is reaction time. I am interested in comparing A to B and A to C. Using aov() on R I run an one way ANOVA with ...
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R: Statistically testing NMDS community differences

Situation I am comparing species communities at 6 different sites. Communities at each site were measured repeatedly over 5 years. I used NMDS plots, based on bray-curtis distance matrices using ...
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Within-subjects experiment using a subset of conditions

I have an experimental design question for which I still haven't found an appropriate answer. Briefly, I'm preparing a user study where we have 11 scenarios. Each scenario involves watching videos ...
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Are there any statistical tests or measures for paired data with more than two groups?

Are there any statistical tests or measures for paired data with more than two groups? My dependent variable is pretty flexible, but I'd really like to have five independent variables compared ...