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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13
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1answer
5k views

How to compute confidence interval in ANOVA with repeated measures?

I made a model using repeated measures univariate ANOVA in R. ...
8
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1answer
1k views

How to handle multiple measurements per participant, with categorical data?

I've done an experiment where I've collected measurements from a number of participants. Each relevant data point has two variables, both categorical: in fact, each variable has two possible values (...
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1answer
784 views

Does Greenhouse-Geisser correction influence the effect size estimation, the statistical significance treshold, or both of them?

I discussed recently with one of my colleagues about the Greenhouse-Geisser correction for non-sphericity. I told him first that this correction is very conservative and that it would be more ...
6
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1answer
584 views

Post hoc tests for robust mixed design ANOVA using R

Is it possible to compute the function mcp2atm with unequal sample size? I ran the robust Mixed Design ANOVA by using tsplit and ...
6
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832 views

Effect size measure for doubly-repeated measures design?

Update: I haven't gotten any answers, so I am simplifying my question. Say I measure test scores of $100$ people in one of two conditions. Each test has $10$ items. On each item, each person can ...
5
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207 views

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 ...
5
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1k views

ROC curves for repeated measures

I am trying to model ROC curves for a longitudinal dataset where participants were measured between 1-13 times. Time is not of interest but the fact that the measurements are autocorrelated an issue. ...
5
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568 views

Is this longitudinal data too complicated for GLMM or GEE?

After writing this post, I've realized that I am running around in circles, chasing my tail. Any help approaching this problem would be greatly appreciated, as I think I just need to bounce ideas ...
5
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0answers
2k views

When using repeated-measures ANOVA in R, what does it mean to specify Error(subject) instead of Error(subject/(A*B))?

For a two-way repeated measures design, we can specify the model using aov in the following fashion: ...
4
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1answer
57 views

Modeling binomial outcomes with repeated measures

I'm looking at patterns of a particular injury within individuals and how they vary by age and sex. For each of 1365 individuals I have four locations each of which may be positive for this injury. ...
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0answers
72 views

What is the origin of the Winer's compound symmetry test of the variance-covariance matrix?

In his famous book, Winer (Statistical principles in experimental design 1971; reedited Winer, Brown, Michels, 1991, p. 517) introduced a test of compound symmetry. The test expands on the likelihood ...
4
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3answers
230 views

Data observed with multiple but unpaired/unmatching observations

I have a dataset with repeated measures, in which for each unit $i$, we observe multiple observations (for the same variable) $y_{ij}$ and multiple $x_{ik}$, but we don't know which $y_{ij}$ ...
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4k views

Generalized eta squared

Partial eta-squared are very often used in psychological litterature. As underlined by some authors (e.g., Baguley, 2009; Bakeman, 2005; Olejnik & Algina, 2003), this standardized measure of ...
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28 views

Is there a principled ANOVA-like approach when a “subject” factor forms a symmetric 2D matrix?

I have a dataset where the dependent variable is a similarity measure between any 2 data channels, lets call it S(i,j), with a few dozen simultaneously recorded channels (so there are quite a few ...
4
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408 views

Is it possible to calculate a log-odds ratio with repeated trials?

Background and Problem This is a continuation of a question posted earlier (here) in which I describe a meta-analysis combining between- and within-subject designs using log-odds ratios (OR) as the ...
4
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783 views

Testing for differences between time series with many timepoints

I think the easiest way to describe my question is with plots. I've run an experiment where I recorded data from animals' brains (EEG) at 6 depths. The animals are recorded at baseline for 25 minutes,...
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1k views

What is the ANOVA equivalent of a matched-pairs t-test? MANOVA?

I have n subjects. I perform an experiment on all the subjects and measure the outcome in two different ways. I want to evaluate the difference between these two types of measurements. I would use a ...
4
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178 views

Analyzing the effects of different scholarships among university students

We have a data set that has data on university students, including their socio-demographic characteristics (sex, first language, ethnicity, residency etc.), GPA and CGPA in each semester (note that ...
4
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1answer
2k views

Mixed between-within subjects ANOVA

I am wondering how interpret tables. I used a mixed ANOVA for analyzing: My within-subjects factor is time (pretest, posttest, follow-up) my between-subjects factor consists of conditions (...
4
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0answers
583 views

Longitudinal data analysis where meaning and metric of response variable varies over time

Determining what factors predict change over time is a topic of investigation in many fields and there are a variety of readily implemented methods for analysing repeated measures in the same metric. ...
4
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0answers
912 views

Simulation for power analysis for higher order repeated measures ANOVA

I am attempting to find a way to perform a power analysis for a higher order repeated measures ANOVA where all factors are within-subjects (i.e., there are no between-subjects factors). I have looked ...
4
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98 views

Repeated measures approach or not?

The basic question here is whether the following situation would warrant a repeated measures approach with a mixed effects model or not. Let's say I have a set of grocery stores in 5 different ...
4
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1answer
10k views

Nonparametric equivalent to mixed and 2-ways repeated measures ANOVA

I have run two psychological experiments. The dependent variable is a rating provided by the participant, that is, an integer number from 0 to 100. The first experiment is a mixed 2x2 design, with ...
4
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0answers
195 views

Fitting a multilevel model to data from an experiment with between- and within-subjects factors

I have data from an experiment that I would like to analyse with a multilevel model. In the experiment, participants read 1 scenario about a person and they had to answer a couple of questions about ...
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177 views

Friedman test to report on occurrence of categories in multiple articles

To investigate reasons for certain behavior, we have defined three categories for these reasons, and have determined how often these were mentioned across 15 (very different) scientific articles. ...
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521 views

Interpretation of mixed model with repeated measures

I have performed the following experiment: Two genotype groups of two different ages were monitored in the presence of three drugs one after the other. So, each subject after a control period received ...
4
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368 views

Linear Discriminant Analysis: Using subject as classification

I have a problem where I need to identify from which subject a particular set of data points came. More specifically, my problem is that I need to demonstrate that my subjects (N=9) can be ...
4
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185 views

Should I run measurement invariance if confirmatory factor analysis is not affirmative?

I have a repeated measures design for a Likert scale with 10 items. This scale is assumed to be unidimensional and this is one of the research questions along with the scales measurement invariance (...
4
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246 views

GLM experimental design issues for count data in landscape experiment

I am analyzing bird count data from surveys conducted each week (from Nov-April, when bird foraging most active near breeding cycle) for 6 years in 9 large experimental plots that are split amongst 3 ...
4
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0answers
239 views

Repeated measures interaction betwen SNP and treatment with R

This is my first question is this forum. I have the a problem that I want to solve with the lme function of the nlme package of <...
4
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0answers
364 views

Linear mixed effects vs. Repeated Measures

I have 46 replicate trees I sampled in a 2 year study. My objective is: To estimate the proportion of variation among-trees w/in year, and proportion variation due to among year and tree interaction. ...
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303 views

Is repeated measures ANOVA appropriate for my experiment and is my sample size large enough?

I'm really confused. I never took statistics but am trying to read up as much as I can. I didn't think much about statistical analysis until after doing the experiment, unfortunately, but maybe ...
4
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1answer
780 views

Compare three groups with very small sample size

I have three treatments: control, treatment1, and treatment2. A total of four patients were examined after receiving each of these three treatments. The dependent variable is continuous. My dataset ...
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41 views

Accounting for repeated measures by resampling data and averaging parameter estimates misses the mark, but why?

Let's say I am looking at how unicorn herd size changes with food quantity. Unicorn herd sizes were surveyed at seven localities over the course of twelve months. Food quantity was assessed monthly, ...
3
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0answers
210 views

Equivalence of ANCOVA and repeated measures model

Consider an RCT with individuals i in 2 arms (group, with 0 = control and 1 = treatment) in which one metric outcome (score) is collected at baseline (pre) and after some treatment (post). In an ...
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73 views

ANOVA/ANCOVA - how to analyse

In a basic research design where you want to test how some intervention (let's say our IV is 'drinking' with the categories water; sprite; and rum) affects some continuous measurement (let's say ...
3
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1answer
725 views

R: Power analysis for a 2 by 2 within-within ANOVA interaction effect [pwr::pwr.f2.test()]

Background I would like to perform a power analysis for the interaction effect in a 2 by 2 within-within ANOVA design. I would like to crosscheck that I am performing this correctly using the ...
3
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0answers
108 views

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 ...
3
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0answers
610 views

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 ...
3
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1answer
64 views

Using GLMM to explain vegetation change as a function of change in soil parameters

I have a dataset that consists of vegetation datasets (species/abundancy tables) and soil parameters (tested for ten parameters per soil core). Three different rounds of these data are recorded in ...
3
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0answers
36 views

Should this be a one-way repeated measures anova?

I'm a new phd researcher and I just completed my first set of experiments. Participants played the same game using three different control mechanisms. In the game they had to complete a series of ...
3
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199 views

Propensity matching and analysis of resultant data on a data set with repeated measures

We have extracted retrospective case-level data collected over several years. We are using the administration of rescue antiemetic in the postanesthesia care unit as a proxy for postoperative nausea ...
3
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0answers
598 views

Is it possible to fit a quantile regression fixed effects model on a repeated measures, panel data, with a nested structure?

In the rqpd package manual it is demonstrated how to fit a fixed effects model on a repeated measures data structure. I am looking for ways to extend this to a repeated measures nested structure, i.e. ...
3
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0answers
271 views

Proof that the Hotelling T$^2$ statistic is invariant under the choice of contrast matrices

Consider an one-way repeated measures design with $n$ subjects and $q$ measurements. It is assumed that $\mathbf{x}_{i}$ are $iid$ q x 1 random vectors that follow multivariate normal distribution, ...
3
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0answers
898 views

Mixed design terminology: “Within-subjects variables” and “random effects”

I have trouble understanding the following statement on Wikipedia about mixed design ANOVAs: Thus, in a mixed-design ANOVA model, one factor (a fixed effects factor) is a between-subjects variable ...
3
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386 views

notation for the regression equation in a nested and repeated measures random effects model

I'm looking for help with regard to the notation for a regression equation in a repeated measures model with nested data, $\eqref{eq:2}$, and connecting the notation back to my model specification, <...
3
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0answers
36 views

Modeling true number of sales based on reported number of sales

I have a sequence of numbers of quarterly sales spanning a decade, say $\{Z_i; 1\leq i \leq m\}$. These numbers are not observed until much later. I do have incomplete observations of this sequence ...
3
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0answers
264 views

3-way repeated measures ANOVA with nlme::lme assuming compound symmetry

For teaching purposes I want to show the similarity between a 3-way repeated measures ANOVA aov(y ~ A*B*C + Error(Subject/(A*B*C)), data) and the corresponding lmm ...
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715 views

Difference in post-hoc tests for repeated measures ANOVA and linear mixed model

I have noticed a difference in post-hoc results produced from a repeated-measures ANOVA and a linear mixed model. Here is reproducible code: ...
3
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0answers
650 views

Computing effect size (partial eta squared) from a RM-ANOVA's F value

I want to calculate the number of participants I need in order to get a power of 0.95, when replicating an effect. The effect size of this effect is not reported in the previous study, which is why I ...

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