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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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Anova on Normalised Data

I have cells expressing a protein under three conditions; Control and two different treatments. I have repeated this experiment 9 times. I need to see whether the treatments are affecting the level of ...
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Repeated measures does not give result

For my thesis, I have to perform a repeated measures analysis. I already found videos and articles about how to perform this and it works with the data that they use in these videos. However, if I ...
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Can I use regression with one independent variable?

I have a question regarding the right choice of statistical test for my data. My data is as follows: I want to assess the predictive power of the CognitiveScore regarding PerformanceHigh (yes or no, ...
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Comparing two groups' retention at three time points

I have data from two groups. One is a control and had no intervention. The other had an intervention to help their retention. I have 3 time points at which I measured retention and attendance (both ...
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Random effects in repeated-measures design using lme

I have a repeated-measures design where participants were measured 4 times each on 2 consecutive days. There were 2 conditions, randomly attributed to day 1 and day 2 for each participant. So, this ...
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Interpreting a 2 x 3 design with two empty cells

My psychology grad student and I have a study conducted in three different countries using two different method variants. Neither country nor method variant is a predictor of focal interest, but might ...
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Bootstrapping with repeated measurements

I am trying to estimate a linear relation between body temperature and body mass, and I have a sample of measurements from subjects, with most subjects having one measurement, but several subjects ...
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Independent or matched groups?

A very beginner level question here: I'm trying to see whether there is a difference in how students assess the usefulness of 5 possible courses to be added to their curriculum. Each student was asked ...
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1answer
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Stata xtlogit, pa vs logistic

I'm a grad student with a moderate statistics background having a bit of trouble figuring out which binary statistics model to use. I have a dataset with repeated measures of patient lab values at ...
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Help regarding experimental design with repeated measures

I am studying the release of Nitrate-N and Ammonium-N from Organic fertilizers by sampling the soils after every 7 days from my treated plots. For instance, I would fertilize my plot on 4/25/2018 and ...
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How is it possible to control for observer bias in measurements with a random effect?

I have a dataset with repeated (but not always) measures of animals. I need to control for observer bias in measuring the morphology of my animal. I'm wondering what is the way to first estimate ...
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2answers
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Which statistical test to analyse?

I am trying to find out how inflammatory markers change in response to a mechanical device change. I have daily readings for the 5 days before the event and for the 5 days after the event. I am ...
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Data transformation on grouped data

I am running an Ax(BxCxS) mixed design. During data screening, I assessed for normality by splitting my data based on the two levels of Factor A. Some variables for one level are nonnormal (and normal ...
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A non-linear regression model for within subject observations

I am trying to perform the equivalent of a repeated-measures ANOVA using data that have a non-linear relationship. There are two independent variables: Spacing between stimulus (10, 20, 35, 45, 60), ...
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In glmer, can I treat both like a random effect and a fixed effect the same factor?

I conducted a memory study and used glmer to find if there was an interaction between time and ...
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Repeated measures/pseudoreplication - Comparing all samples against all other samples

I am currently analysing some data, and I am not confident that I am going about it in as statistically sound way. We are trying to determine whether our treatments affect the distance between two ...
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Evaluating the variation of two variables through time

I'm currently trying to figure out a statistical issue. I have two variables: -HRV measures -Cognitive measures For these two variables I have 7 time bin (i.e., the first 40 trials, the second 40 ...
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Abbreviated repeated measures factorial design - not everyone takes all conditions

We are planning a study in which participants are shown profiles that vary across three factors with 3 x 2 x 2 levels. We don't want to do this fully between-participants, but also don't want to give ...
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Comparing regression/correlation values within-subjects? Repeated Measures ANOVA afters Fishers Transform?

I was interested in the most appropriate way to assess whether there is a difference in the R values from a regression analysis in a repeated measures design. I transformed my R values using a ...
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Repeated measures with rotation of subjects within groups

I was wondering if you could help with the interpretation of a potential experimental design. We are testing two versions of a 'group' exam, score (out of 100) being the outcome variable, aggregated ...
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How to test for a difference between differences?

I have 6 sites with 3 sites as constant food in a feeder and 3 sites as pulsed food in a feeder. For the pulsed food sites, there are days with food and without food.So, I have 2 treatments: constant, ...
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1answer
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Repeated measures correlation as mixed model

I'm writing this question to better understand how to set up a mixed model to estimate a linear relationship between two variables from repeated observations. Suppose the variables $X$ and $Y$ are ...
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1answer
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Repeated measure correlation in Python

I'm trying to see if there's correlation between two variables over days for different individuals. I have 100 individuals' data over 60 days. For each day, I have the distance traveled on that day ...
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Meta-analyzing means/SDs from repeated-measures studies

I'm working on a meta analysis of prospective studies assessing changes to mental health in the year following an event. For the purposes of example, say it's the severity of depressive symptoms (...
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Significance of the autocorrelation for repeated measures

For example, I perform the following experiment: I invite the person and instruct him to stare on some object for 10 minutes. During this trial, I detect blinks and measure inter-blinks intervals (...
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Sample size calculation and number of independent variables for repeated measures Generalized Estimating Equations

I'm trying to understand sample size estimates for repeated measures Generalized Estimating Equations. Reading papers on this topic, it seems that the number of independent variables are not assumed ...
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Split split plot: defining expected Mean Square error term for calculation of F values

Note: my endgoal concerns multivariate analysis but I do not believe my question is specific to this setting Motivation: the RRPP R package allows to analyze composition data (i.e. multivariate) ...
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Logistic regression with repeated mesures and unique outcome

I have one independent continuous and time-dependent variable X, repeatedly measured (from 1 to 4 times) in different patients during some period of time. My dependent variable Y is binary and is ...
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Mixed Effects Logistic Regression w/ Repeated Measures for Observational Data

I am working on a study of how different scholarship programs at a university may influence student retention (i.e., if students are still enrolled at the university one year later). Each student can ...
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Which multivariate test on repeated k-fold cross-validation with collinearity?

I am running repeated k-fold cross validation (5x5-fold) for comparing two models based on 3 dependent numerical variables (X, Y, Z) and 4 independent categorical variables (A (two groups), B (five ...
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1answer
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Repeated measures regression in R?

I am looking for a way to perform linear regression in R. So far I have done a lot of regression analyses, but never with repeated measures. My dataset has the following variables: DV - the ...
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1answer
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Accuracy vs Precision: Can I use the Sphercity Assumption data in a meaningful way?

I understand that when conducting a repeated measures design with say one factor having three levels (Training: None, Standard, New Method), in the analysis you want the sphercity assumption to not be ...
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How to compare turnover rates across three facilities over a period of 5 years?

I need to compare the turnover rates between 3 facilities (turnover calculated as number of voluntary & involuntary terminations divided by the average number of staff multiplied by 100). In ...
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1answer
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Should I use repeated measures anova? and what post hoc should I use?

I have an independent variable which is observed 3 times over the span of 78 hours (24, 48, 72) respectively. Should I use repeated measure anova or should I treat the hours of observation as a ...
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REPEATED MEASURES DESIGN

I am not sure how the results of this study should be analysed given its design. I have searched everywhere for this info on this TYPE of experimental design and have had no luck. I don't even know ...
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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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1answer
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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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1answer
241 views

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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1answer
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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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1answer
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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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1answer
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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 ...