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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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Generalized Linear Mixed Effects Logistic Regression with Repeated Measures

I have an experiment where subjects reported multiple results (binary) in two treatments. I have compared each subject separately to see if the treatment had an effect on a given subject, but would ...
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Estimates radically change when including Random Slopes in Multiple Logistic Regression

I am interested in the fixed effects of two within-subject experimental manipulations (i.e., Ambiguity 0 = No / 1 = Yes, and Uncertainty 0 = No / 1 = Yes) on a dichotomized variable (i.e., Punishment, ...
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order of levels in crossed design

How can I determine if a factor A is nested in B or B is nested in ...
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Within-subject test controlling for a third variable. with classical regression

I would like to compute a within subject test controlling for a third variable using a classical regression analysis. This is the design: DV: score IV1: Time = time1 vs. time2 (within-subject) IV2: ...
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Power analysis for t-test instead of ANOVA

Let's say I have an experiment with a 2x2 repeated-measures design. Let's call the four cells A1B1, A1B2, A2B1, A2B2, for the factors A and B, each with two conditions, labeled 1 and 2. I want to ...
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Using chi square on unequal groups with unequal repeated trials

My dataset includes four groups (A, B, C, D) of unequal numbers of individuals. Each individual engages in an activity that results in one of three categorical outcomes (X, Y, Z). The individuals ...
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Right model approach for repeated observations

The problem: Panel Data, nested data or repeated observations for the same individual over eleven years. All independent variables are fixed effects and could be categorical or continuous variables. ...
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Best Practice: Multiple Correlations with the same Variable

I am facing the issue that I want to test the correlation between one variable and multiple other variables. The data stems from an Experiment, where I have a control variable of which I want to test ...
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Computing average of repeated measures before linear regression

Suppose I have a repeated measures dataset where multiple measures of a continuous outcome are taken on each subject in the dataset. How would one perform linear regression? Does it make sense to ...
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Linear Mixed Model for evaluation of students

My dataset about students (n=74) contains one outcome variable (exam points/integer) and eight predictor variables: 2 categorical: gender [F,M] study years [1,2,3] 6 continuous variables: age [...
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Multiple Observations per Subject per Time-point analysis?

I am having a difficult time finding an appropriate test for my analysis. Please help - In my study I have 130 participants who were tested with a binary outcome (pass [1] /fail [0]) before and ...
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Analyzing pre-post data without a control or random assignment

We want to model the effects of an outreach campaign on people's attitudes towards a species of animal. We surveyed people pre- and post-campaign to ask about: Their attitudes pre-campaign (pre-...
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Analysis of repeated measures at different timing

I'd like to ask how can analyse data of different patients if they have repeated measures at different timing. How can I group repeated measures to each patient in order to have descriptive data of ...
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Compare change score across groups VS relation between pre score and change score

I have some data of pre/post structure of about N = 100 subjects. Some training is given, and the same tests are given before and after the training on knowledge and attitudes about some subject ...
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Account for Panel Correction with a Large Number of Respondent

I am currently running a binary logit model which looks at whether a participant, when he/she makes a bid on an offer, is successfully selected. Data: I have a data of more than 80,000 observations. ...
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lmer for repeated measures

I have several animal pairs pair. For each, I repeatedly measured daily proportions of time they spent in contact time.con (30-...
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How to test if a variable is a confounder in a repeated-measures design?

I would like to test is a given variable is associated with both the dependent and the independent variables (and therefore a potential confounder) in a repeated-measures design. My model has a ...
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Difference between Within-Subject Contrasts and Pairwise Comparisons in a Repeated Measures ANOVA

I'm running a two way repeated measures ANOVA, and I'm having trouble finding what is the appropriate output to report (Contrasts vs Pairwise Comparisons). I have a 2x5 design. Lets say I have ...
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ANOVA with two repeated measures/within subjects factors

We are working on a BOLD fMRI study with a visual stimulation block design. Participants get to see 4 visual stimuli categories in blocks. Each participant belongs to one out of three "experimental" ...
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Appropriate follow-up test in a 2-way within groups ANOVA

I have a 2 (time1 vs time2) x 2 (drug blood concentration: resting vs. post-exercise) within subjects design. I want to know if the difference between post-exercise and baseline is different at each ...
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Can someone confirm if I am running this generalized linear model in R correctly? Multiple observations in each experimental unit

I'm a grad student and stats beginner just trying to make sure I'm using the right model and using it correctly. I'm using R version 3.5.0. My data look like this: ...
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GEE vs mixed model for time-varying covariate

Assuming the attached dataset, I am looking to examine whether participants who are treated are more/less likely to have high addiction severity compared to non-treated. Both treatment and high ...
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Correlations between variables in a repeated measures experiment

I have a dataset with, to make things simple, 3 variables (Response, PredictorA, and PredictorB) measured in multiple subjects over time. I am administering a toxin to my subjects (lets say there are ~...
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R Mixed-Effect Models for 2-way Repeated Measures Design with more than 2-levels in each factor

Background: I am running an experiment with the following parameters. Design: 2-way Repeated Measures Design (as of right now there are NO between-group/grouping variables Dependent Variable: A ...
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How is correlation among repeated measures calculated for ANOVA interaction effect?

I am performing a replication study, of an interaction effect found in repeated measures ANOVA. The study is of a 2X2 design (1 group of subjects, 4 measurements each). To estimate the required ...
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Repeated measurements descriptive statistics for whole period

I am looking at the number of doctor’s visits over a 10-year period in about 2000 municipalities. Each municipality is assigned to one of five municipality types (e.g. large town, rural community, ..)....
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Including baseline measure as control variable for DV and IVs when testing the effect of change on change

I am attempting to run an OLS regression: A cooking intervention resulted in increases in vegetable intake compared to control after 12weeks. There were no differences in motivation between control ...
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Is the R package Multivariate Imputation by Chained Equations suitable to fill in repeated measures survey data?

I am dealing with a dataset that contains demographic covariates (constant across time) and dummy variables for subjects for six repeated measures in wide format. I.e. a row represents a single ...
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glmer post hoc test at each time point

I have a question about post hoc tests for glmer. I haven't been able to find a solution on this site or in the documentation. My experiment looks at repeated measures of flower counts (Total) across ...
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Centering covariates with repeated measures ANCOVA

I have a study design with a repeated measures variable (four time points) and a time-invariant covariate. I am analyzing the data using a repeated measures ANCOVA in SPSS. I am interested in the ...
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Test of concavity for repeated measures data

First question here. I'm trying to figure out what statistical test is appropriate for testing whether a series of data is concave or convex. Specifically, this is coming from a human subjects ...
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1answer
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Post hoc analysis after two-way repeated measures ANOVA

I am measuring test performance at 10 different timepoints, before and after drug application. So far I ran two-way repeated measures ANOVA and determined there is a significant timepoint, drug, and ...
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1answer
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Measuring blinding procedure in a 3 conditions repeated measures experimentation

I'm confused about what to do, chi-square or something else. I want to measure the efficiency of my blinding procedure. In my study, each participants received 3 conditions (10Hz, 20Hz, sham). After ...
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non-parametric tests for repeated observations

I am looking for an RM-ANOVA alternative that fits with non-normal data that may not satisfy sphericity assumption. My dataset: Through a mark and recapture study, I trapped turtles, and collected ...
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One group; multiple within-subject conditions - which test/design am I using?

I am a statistics beginner and trying to get a better general understanding ... let's consider this fictional experiment: I am testing 30 couples. Each couple will participate in three successive ...
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Regression on a change between a variable before and after?

In my dissertation I am using a paired sample t test to see if there is a statistically significant difference between consumers' intention to purchase from and attitudes towards purchasing from a ...
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Time Series of Wound Healing percentages / proportions

I am looking at wound healing over time and have hit a wall with analysis. My data consist of injury cases which are tracked over time. Injury healing is measured as percentage wound area/perimeter ...
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Descriptive analyses of repeated measures data

I have a dataset with repeated measures of a continuous outcome in a closed cohort of individuals at multiple timepoints that are equally spaced. Beyond the use of the mean, median, outlier ...
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Survical model: get time-dependent survival estimates with nested random effect and repeated measurements

In an ecological experiment I have recorded survival of individuals in response to two different food items (treatment). Individuals belong to different families (random term) and are measured at 5 ...
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Repeated measures to predict binary outcome

I would like to predict outcome of an event based on repeated measures. The problem is the following one: I have 100 patients with measures of a certain feature at different times, but all the ...
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Assess statistical significance with before & after binomial data from few participants

For the quantitative analysis of a pedagogical approach, I applied a series of (equivalent) tests prior and after lessons. I want to evaluate the reading (proper identification of sounds from written ...
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Analyzing multiple repeated measurements from same individuals under different conditions

I have 4 participants who are exposed to two different environments A and B and their skin temperature is measured every 10 minutes for 1 h. Hence there is 7 measurements per one experiment (0min, ...
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checking normality in repeated ANOVA (residuals vs differences)

If I check for the assumptions of a repeated ANOVA (one IV with 3 measurements) I need to check for the normality of differences. From t-test for paired data I know, I calculate the difference and ...
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How to analyze repeated measures data w/ no groups and w/o averaging the repeated measure scores

STUDY DESIGN: -- N=110 participants. -- I do NOT have groups – everyone in the study does the exact same thing. -- There were 3 waves, each separated by 2 days. Participants completed a survey at each ...
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1answer
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Lmer set up for repeated measurements?

I have 139 subjects (ID), with measurements taken at two time points (Time1, Time2), at 148 brain regions, a dependent measure called volume, and a covariate called thickness. Each subject has 148 ...
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Correct to evaluate the relation between likert type ratings, response time, and age with repeated measures ANOVA and covariates?

I would like to kindly ask you for your point of view on whether my approach is correct. First I will describe my project, then I will ask a question: I conducted approx. 30 surveys in which 28 to ...
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Valid use of repeated measures ANCOVA

I am running a repeated measures study with four time points. A single group of participants receive the same questionnaire at each time point, which is assessing variable X. I am determining how ...
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Which statistical analysis is most appropriate to determine differences between 3 treatments and control for monthly and yearly variation?

I have a 4-year dataset of zooplankton biomass that was sampled three times a summer (i.e. June, July, August) for all four years. There are 6 sites that were sampled in triplicate (took 3 reps): two ...
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Questions about conducting Mixed-Design ANOVA in R

I have a dataset that includes one IV with 3 levels (group 1, group 2, and group 3) and a repeated DV (pre test score and post test score). I am using R, but I'm unsure what codes I should use to test ...
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Calculating Repeatability by MCMCglmm

I'm trying to calculate repeatability of aggression (ordinal scores ranging from 1 to 6) of individuals. Individuals (ID) are not independent, but are nested within colonies. We know that colonies ...