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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Measuring variability in blood pressure in a repeated measures design with different time intervals between study visits

I have repeated measures on blood pressure for a lot of patients, measured at different intervals (table below). I want my standard deviation to reflect that a large deviation in blood pressure ...
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linear mixed effects models: should I aggregate repeated trials?

A colleague of mine asked me to analyse some data from a movement experiment. Participants were asked to turn their head three times to the left (toL), three times to the right (toR), with both the ...
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Is there an R function for a robust three-way mixed ANOVA?

I'm a PhD student in the social sciences and I have run into some issues analyzing my dissertation data - namely, non-normality, and to a lesser degree, heterogeneity of variance. Specifically, I am ...
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accounting for standard errors when examining correlation between parameters

I have a repeated measures data set with about 100 unique individuals responding (50 responses per individual) that I am using to estimate two different models that each have one parameter. I would ...
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3 factors, one of them not fully crossed --> repeated measure?

I am not sure which statistical analysis to use for my data (in SPSS). I did not realize until the data was collected, what an odd design I had constructed... I would greatly appreciate your help! I ...
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How to calculate the sample size by using G*Power for repeated measure anova?

I need to calculate sample size by using power analysis. My experiment is a 2*3 repeated measures ANOVA which means there are 2 independent variables and each one of them has three conditions. I'm ...
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How to analyze the data for measuring multiply site from same patients? Repeated Measures Analysis of Variance (ANOVA)?

I am doing a study to evaluate the effect of ossification ligament on thoracic vertebra. The purpose was to explore whether the evoked potentials is different between compressed area and uncompressed ...
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Single subject anova

I collected walking speed data over 2 weeks for a single subject. These different walking speed were separated into 7 different groups based on whether they were extracted during a shorter or longer ...
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Is GEE the simplest choice for a 2x2 factorial design with repeated measures and binary dependent variable?

I have a 2x2 factorial design. Both independent variables are binary (age: young/old and condition: experimental/control). Age is between subject and condition is within subject. The dependent ...
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Repeated measurements of one set of samples before and after treatment?

Given a set of samples that are measured before and after treatment. The size of the treatment effect depends on the measurement value before treatment. However, the number of measurements per sample, ...
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Compare variability of a panel of measures collected at five different timepoints

I have a panel of 60 measures that have been collected from 14 people on 5 consecutive days I have a second panel of 40 different measures that have been performed under the same conditions. Ideally, ...
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How to calculate the slope per day using 3 measurements?

I have a dataset of 134 lung cancer patients who had an inflammatory biomarker measured at 3 time points before during and after therapy - we're trying to investigate if the biomarker is predictive of ...
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Similarity of N Dimensional Panel Across >2 Repeated Measures

Looking for some signposting really. Thanks in advance I'm trying to determine how useful a biomarker panel is. I've recruited 15 participants who have provided a sample on 5 consecutive days the ...
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Is pooling countries together or running a regression model for each country alone is more suitable for comparison?

My research questions are: Does the gap in earnings has changed between individuals with different educational levels between 2007 and 2010 (before and after the 2008 financial crisis). Does that ...
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Glmer two measurements, two groups, gamma distribution

i wondered whether this is the right approach for my data. I have two groups that completed a questionnaire twice (so two measurements for each subject). My data kinda looks like this: ...
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Is a repeated measures t-test appropriate for this scenario?

I am working with a dataset that involves participants taking a baseline test and a post-test. The company I am working with has the mean baseline score for participants from a year ago, and they ...
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How do I compare two sets of subjective exertion ratings given by treadmill runners at 8 time points during two experimental sessions a week apart?

Thanks in advance for your advice—here's a sample of my data for one participant to add context, also shown in a screenshot below. 2 running workouts were done on a treadmill. Exertion ratings (...
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repeated measures ANOVA or one-way ANOVA for a radiology study? [duplicate]

I am conducting a study on different image reconstruction algorithms for computed tomography (CT). My aim is to investigate which of the image reconstruction algorithms that have the highest signal-to-...
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ANOVA? MANOVA? repeated ANOVA? what test to choose for my purpose?

I'm having a hard time to choose the correct test that fits the study I conducted and if the general approch is correct. The test design is as follows (simplified): 10 different participants rode ...
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singular fit issue due to data structure in mixed regression?

I am trying to analyse the effect of agreement with various items and respective sentiment towards these items on election results. I have a probability describing how much the parties agree with the ...
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Odd sample size in GPower (Repeated Measures ANOVA, within factor)

I am going to conduct a pretty simple experiment: one within factor with 8 levels for a single group of participants. I'm trying to determine the apporpriate sample size using GPower based on an ...
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What do the “Corr” values under random effects section of the nlme output mean?

When I want to analyze longitudinal data with few observations, I implement it in the following way: ...
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116 views

Paired and repeated measures! Now what? ANOVA or mixed model?

I have a simple setup. I have 10 patients and I would like to test the effect of a certain drug on kidney function. Each patient will serve as his own control and intervention. First for the control ...
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Aside ANOVA[Repeated Measure], is there a more efficient approach to repeated measure longitudinal data?

I came across a discussion thread on ResearchGate's where one researcher mentioned that repeated measure ANOVA is an outdated approach to longitudinal and intensive longitudinal data. It is known that ...
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How to build a correct GAM model with repeated measurement and replicates?

i made an experiment with repeated measurement depending on time scale and I was advised to use GAM model to describe my data. I made an experiment on 12 mesocosms (big tanks) for 6 weeks to test the ...
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Within and between group factor in linear mixed model?

Could I please get some advice on coding a linear mixed model for looking at between and within group effect. I have 2 Timepoints (Baseline and 12 weeks Post intervention) and 2 groups (Ex1 and Ex2). <...
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How to run repeated measures in mvabund?

I have a dataset of fish species abundances collected from 6 different habitats over the course of 30 years. Fish were collected multiple times per year and environmental variables were recorded at ...
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How to do regression using paired points extracted from time series? continuous categories/Gaussian Processes

Consider something being measured using two analytical methods, a Standard and an Experimental, over a period of time. In this simple example I'd like to extract the paired Standard&Experimental ...
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Whats the right statistical assay for testing groups of differently treated human cells

I'd like to analyse my data but I'm unsure about the correct statistical test as I find conflicting opinions during my online research. About my data: I have a control group, which I'd like to compare ...
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Linear Mixed Effect Model: Control for Continuous Variable that Changes with Condition

This is a neuroimaging study. I have a repeated measures study, where each subject has been scanned under two conditions (Movie1 and Movie2) (same day). I have measured how much they moved during the ...
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Bayesian estimate of treatment effect for within-subjects and between-subjects design

Let's say I'm running an experiment with an experimental condition and a control condition, where four subjects in total provide two reaction times each. I'm interested in estimating the treatment ...
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How to look at correlation between dependent variable and independent variable with independent variable measured twice?

I have a dataset, where a cohort underwent two measurements (concentrations before and after surgery) and I now would like to see, whether those measurements show a correlation with a third ...
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Between Subject Covariates and Within Subject Variables in Longitudinal - Long format data

I have a longitudinal nested and crossed design dataset with both between-subject covariates and within-subject variables. My study design is below in figure 1. As shown, the between-subject variable ...
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Intra-individual associations

let me preface by saying I'm very new to quantitative analyses. DATA BACKGROUND: I am working with multiple observation data where individual IDs have several documented purchases in one day which are ...
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Analysis of binomial variables with random effects

I have a study where each of the 43 items is a question to which the response may be A or B and I want to infer whether A has been chosen significantly more than B. There are 20 participants and 43 ...
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Alternatives to binomial test when the observations are not independent

In my experiment, participants had to choose between two possible answers (say A and B) for different (40+) questions. I want to test whether option A is chosen more frequently than the alternative; I ...
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Why is it that repeated measures ANOVA does not allow continuous between-subjects factor?

I have a continuous DV measured in Time 1 and 2; time is my primary IV here. Also, there's a continuous, time-invariant moderator for each participant. I want to see whether the effect of Time on DV (...
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How to perform regression on dataset with varying number of observations for each athlete?

I am trying to figure out the finishing times of different marathon runners in a race by using their past racing times and personal data to predict their finishing times in an upcoming race that they ...
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Mixed Effects Model with Binomial Repeated Mesures

I have a dataset that most likely requires a logistic mixed-effects model, but I would like a confirm that this modeling is correct. Group A read a random sequence of 8 highly confident memories ...
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Computing statistical Significance of Rank Order Question

In my questionnaire, I have a rank order question concerning three different videos. Each respondent must rank each of the videos either on position 1, 2 or 3. All respondents are in the same group (...
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Is it possible to perform a pre-test post study with different sample groups?

I want to perform a study in which I compare two groups before and after an intervention (communication training) on patient experience. This will take place at an outpatient clinic in which patients ...
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Contrasts in linear mixed model with repeated measurements in SPSS

I am currently building a linear mixed model with repeated measurements in SPSS. My syntax is: MIXED measurement BY female mediansplit time WITH age /CRITERIA=DFMETHOD(SATTERTHWAITE) CIN(95) MXITER(...
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On which level to look for outliers? Individual, collapsed or per condition?

This is a rather simple question about the level at which one should look for outliers. I have data from 100 subjects from 5 conditions (between subject), 1000 observations per person (within subject)....
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Can two sources of information be combined to get a better prediction than given by either multiple regression or time series analysis?

Suppose I have a data set, which I will call Height-Weight-Age featuring annual height and weight measurements of $N$ people from ages 10 to 30, where $N$ is relatively large, e.g. $N \approx 5000$. I ...
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Differences between RM Anova and RM Manova

I've a conceptual question here regarding the use of ANOVA and MANOVA for fully within (repeated measures) data. It seems that with no covariates or other factors, a repeated-measures ANOVA and a ...
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Specification of nested random effects in glmer

I have a doubt about nesting random effects. I'm using R with the lme4 package and, in particular, the glmer function with binary family. I will describe the data first -- In this experiment, people ...
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One-sequence Two-period crossover with repeated measures

I am struggling a bit with determining how to properly specify a model. I have multiple repeated measures on individuals prior to some exposure, and then multiple repeated measures on individuals ...
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How to assess the fixed effect of age in a repeated-measures design with a linear mixed model

In my experiment I want to assess the effect of age on various response variables (all continuously distributed). The experiment is a repeated-measures design with 7 conditions (1 predictor variable ...
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Test-retest reliability: Calculation of intraclass correlation coefficient with random and fixed effects

I have a design in which each participant is measured at three days. On each day, participants are measured twice. The dataset is structured as follows: $$ \begin{array}{c|c|c|c} y & \text{Subject ...
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G*Power calculating the correlation among repeated measures - Fisher z-transformation

I want to calculate the sample size in G*Power for a study. It is measuring social distancing behavior (proportions showing the least appropriate distance in %) at four different time points (factor). ...

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