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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8 views

Is this random effects crossed design correct in my GLMM?

I am confused about how random effects are structured in my model. I've read the discussion about it Crossed vs nested random effects: how do they differ and how are they specified correctly in lme4?. ...
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25 views

How to measure a pre-post change?

I would be very grateful for any advice on how to analyze the data of a small study I have conducted. The study has only one group of participants and their performance in a test was measured for 5 ...
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1answer
27 views

Visualizing repeated measures (not longitudinal)

I have repeated measures for a large number of variables and about a hundred individuals. These measures are repeated to assure reproducibility and are not longitudinal time points. I want to provide ...
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12 views

How to represented nested model with a varying slope?

I have a study wherein we enrolled about 40 subjects and from each subject we have collected repeated images of burns on subject's body. Approx. 2 burn locations on the body are selected initially and ...
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1answer
36 views

Specifying a mixed model with cross correlations and hierarchies in Lme4 syntax

My aim is to predict the quality $y$ of a food product based on measurements $x_a$ and $x_b$ on the main ingredient. I have several batches of a food product that are evaluated for quality by ...
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19 views

Repeated-Measures ANOVA or Multivariate ANOVA - and how to calculate power?

I am trying to determine the experimental design and find a proper method for statistical analysis, especially to assess power (or the sample size needed for a specified power). First, let me explain ...
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Multilevel multinominal logistic regression

For the analysis of repeated measurements data by developing a multilevel multinominal logistic model, in what format should the data set be prepared? What about any other technical pearls?
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Which tests should i do with a control group and a experimental group with pretest-posttest design ( 2 levels)

I have an experimental design with a Control Group and a Experimental Group, i have one pretest and one posttest ( 2 levels i think i´ts called) for 5 different variables. Which tests should i run on ...
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1answer
24 views

Mixed effects model for longitudinal data with nested random effects?

I have three groups, one control, a low dose treatment, and a high dose treatment. These groups are composed of 6 subjects nested in each group, for a total of 18 subjects. Each of these 18 subjects ...
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35 views

GLM Repeated Measures, with only two time-points (pre-post)?

I have a dataset that comprises of the same variable, measured at two different time-points (Pre-treatment and Post-Treatment). I want to check if there is an effect of Age in the results of the ...
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1answer
25 views

Linear mixed model with one categorical and one continuous fixed effect possible?

I'm planning on using a (linear mixed model) LMM for my analyses but am not 100% sure if it is actually suitable. This is what my data are like: I have one variable measured 4 times for each ...
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Could we consider the cell experiment at multiply time points as a repeated measurement design?

We conduct a study for exploring the mechanism of osteoporosis. There is an experiment about observing the biological reactions of osteocyte when we treat it as three drugs (A, B, C type). First, we ...
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Repeated-measures ANOVA - Where is the difference? [closed]

If I conduct a repeated-measures ANOVA and the p-value is significant (i.e., the means are NOT the same at all time points), what subsequent test would I conduct to determine where the difference(s) ...
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Can I calculate a repeated measures ANOVA using pre-post difference scores between conditions?

I want to run a within-subject experiment with three interventions. I want to see if these interventions change how my subjects perceive certain stimuli. Now I am torn between two different approaches....
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Null Hypothesis in Repeated Measures Study

I am designing an uncontrolled, prospective study (one group) with continuous outcome variables, which will be measured at 3 points in time (i.e., baseline, timepoint_1, timepoint_2). If the null ...
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Contextual levels with 1:1 clustered observational units

Imagine a study that, from a design perspective, has both repeated measures and hierarchical structures. The ratio of observational units at level -3 to level-2 is 1:1(For example, "only one &...
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Three-way ANOVA with repeated measures in R

I need urgent help for my bachelor thesis. my advisor is on vacation for 4 weeks and therefore can't really help me with my questions. I am doing a three way anova with repeated measures. each factor ...
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How to perform ANOVA for data measured with unequal time interval?

So I have a set of patient data divided into 3 groups based upon their vision. I also have data on few variables that I believe to be relevent which are measured pre-surgery, 1 day post-surgery, and 7-...
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Multilevel model for questionnaire-like data

I am trying to create a multilevel model to investigate this question, but I can't come up with a solution (it's the first time I do multi-level modeling, and my statistics skills are rather ...
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Why is the sphericity assumption sufficient for the $F$ test in RMANOVA?

To the best of my knowledge, a one-way RMANOVA is typically formulated as $Y_{ij}=\mu+\alpha_i+\beta_j+\epsilon_{ij}$ where $Y_{ij}$ is the response variable, $\alpha_i$ is the fixed time effect, $\...
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Repeated measures ANOVA comparing before and after intervention but has two types of "after intervention" conditions

I'm running a within-subject study that looks at subjects' performance before and after an intervention. In the study, subjects would perform a task (Task X), followed by a training, and then two ...
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11 views

Repeat Anova with Percentage Changes vs. actual numbers

I have 100 subjects. Their weights were measured at time1 (baseline, before intervention), time2 (after intervention), and time3 (after intervention). we want to see the trend/changes in percentage ...
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1answer
33 views

How to analysis the repeated measured study where combine with matched pairs?

I am doing a study to evaluate the effect of treatment on eyes. The purpose was to explore whether the level of X protein is different between treatment group (sick eye) and normal control group (...
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1answer
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How to test the effect of a grouping factor that should be random to account for repeated measures?

Experimental plan: several species of animals were observed for a year, but not regularly (some months have many observations, others have less). All individuals belonging to the same species were ...
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Test for difference at each time point in panel data of long time series?

The easiest way to describe my question is perhaps with plots: In this hypothetical data, each group has 9 subjects, and each subject's response is measured from time = 1… to 5. Is there a way to ...
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How to test effects of multiple predictors on repeated measure binary outcome

What type of test is equivalent to a 3x2x2 repeated measures ANCOVA, when the repeated measure outcome variable is binary (correct/incorrect)? I have a 3x2x2 between subjects design. Participants are ...
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1answer
26 views

Which test for an ordinal dependent data in a pretest posttest design

This is a pretest-posttest design with a control group (no treatment between measurements) and an experimental group (treatment between measurements). All measurements consist of the same rubric and ...
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1answer
29 views

Nested repeated measures linear mixed-effects model without time as a variable

I want to build a linear repeated measures mixed-effects model in R. I have a sample N=105 that completed measures at two timepoints (baseline and follow-up), and small group (N= 29) that received an ...
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1answer
9 views

Gauge R&R analysis - Preicision of a system

I never attempted to do a GR&R analysis before so I'm sharing an overview of what I would like to attempt to do and hopefully I would get some insight/advice/reference on which approach I should ...
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Unbounded variance components for split-plot, RCBD, repeated over several years

I have a Randomized Complete Block design with 2 factors, replicated over 4 blocks and repeated over 4 years. Each block has 9 plots and each plot is divided into 2 subplots. The main-plot factor has ...
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Uneven Samples at each wave in non-experimental Random Intercept Cross-Lagged Panel Model

I have data from people attending psychological therapy in a non-experimental setting. As this is a naturalistic setting, participants attend a different number of sessions. The sample size is N = 639,...
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how can analyze repeated measured with block(replicated) data

I'm very confused about this data to analyze. First time, I think it is simple repeated measured data, but I'm not sure below analysis is correct to analyzed. looks like something wrong. but I can't ...
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29 views

Covariance structures for multinomial logistic mixed models

I am using ordinal::clmm in R for analysis of ordinal repeated measures data. My understanding is that specifying random intercept: (1|judge) as random effects in <...
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51 views

ANOVA Repeated Measures crossover design, number of measurements in GPower?

I am planning an experiment in which I will have a group of animals which I will give both the control diet also test them on the treatment diet. I think I can use repeated measures ANOVA for this. I'...
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2answers
66 views

Choosing a linear model to take into account multiple observations from the same individuals

I’m looking at how temperature varies across age. Can you help me to choose the most appropriate linear model to this analysis? I’ve got multiple measures from 1 individual per age (13 in total), and ...
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1answer
57 views

How to analyze longitudinal data in R?

I am trying to examine how an athlete’s performance influences their articulations on Twitter on specific dimensions of research interest (e.g., use of ‘we’ personal pronoun). I have all the tweets of ...
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21 views

Hypothesis test (2 groups, daily readings per person in each group)

I am running an experiment: there are 2 groups of people and a reading is taken for every person every day. So I have this dataset: Group A ...
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16 views

Determining Effect size for Quade Test

I did a Quade Test as a non-parametric alternative of the one-factorial repeated measures ANOVA, as my data are not normally distributed. My experimental design includes one factor having 3 levels (t1,...
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2answers
57 views

Does aligned rank transform ANOVA require normally distributed data?

Initially, I wanted to do a two-factorial (4x3) repeated measures ANOVA in order to analyse my data. To be more precise, I do have two factors with factor1 having 4 levels (A, B, C, D), factor2 having ...
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1answer
28 views

Interpreting unintuitive fixed effects sizes in linear mixed effects models

We are working on the analysis of an online behavioral experiment in which participants had to solve problems presented in two different linguistic tenses. One of them was ...
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1answer
19 views

Comparison between two groups of time series?

I have two groups of people. One group of people are healthy and the other group of people is sick. For people in both groups, I let them do exercise for 10 mins and then let them rest for 3 mins. I ...
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1answer
31 views

The method for analyzing the repeated measures study when the data was non-normal distributions

When we conduct the repeated measures data (a continuous dependent variable) by using the method of repeated measures ANOVA, GEE or Multilevel models, the data was need follow normally distributed (...
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1answer
44 views

In a linear mixed model, can I put continuous covariates and a random effect if they are measured at the same level?

I collected growth data on trees on 15 treated and 15 untreated sites. We have 10 trees by site and each tree has 7 years of data (2100 rows). The treatment was applied after year 5 so we decided to ...
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GPower: How to analyse repeated measures (within-comparison) data where the number of participants decreases in each measurement

We conducted an experiment with two groups and three separate measurements, which were conducted 2 weeks apart. The number of participants decreased in each measurement because of the Covid pandemic (...
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20 views

Repeated Measures ANOVA Tests of Within-Subjects Contrasts

Using the MIXED procedure and a set of repeated measures data of vertical format, I obtained the results of fixed effect estimates and related t-tests for orthogonal polynomial linear and quadratic ...
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10 views

Unclear definition of "N-way ANOVA" and "N-way mixed ANOVA"

I am confused about the definition of "N-way ANOVA" and "N-way mixed ANOVA". Are they two totally disjoint classes? Or does "N-way ANOVA" includes "N-way mixed ANOVA&...
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2answers
230 views

Paired t-test with multiple observations per pair

I have a bunch of websites websiteA....websiteZ for example. Now I have an optimization technique that possibly improves the performance of these websites. I want to check whether this technique ...
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1answer
35 views

Difference in slope in longitudinal study

I have a longitudinal study where subjects are measured at given time points and a response is recorded. Each subject belongs to one of three groups (A, B, C) and I'm interested in whether the slope ...
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1answer
98 views

How to analyze the data for multiply measuring result from the mice pass the machine for Gait Analysis?

We want to compare the difference of the data from Gait Analysis between normal group and treatment group in mice. There are 6 mice in the normal group and treatment group, respectively. We plan to ...
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1answer
84 views

How to fit a repeated measure GAM model with mgcv?

We are hoping for some guidance regarding a gam model using mgcv R package. We want to know if variables measured over time affect our outcome variable. In other words if variable "X" and/or ...

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