All Questions
Tagged with lme4-nlme repeated-measures
377 questions
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How do I correctly formulate the random effects with repeated measures in a paired design
Sorry if this is a cross-posting, but I haven't found the exact solution for my problem yet.
Let us assume I have an experiment with 20 households, with 2 people each (1 female + 1 male).
Over the ...
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1
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49
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How do I compute the intra-rater intraclass correlation for a study design with some repeated measures?
How do I compute the intra-rater intraclass correlation for a study design with some repeated measures?
The study had approximately 1000 subjects rated (continuously 0-100%) by 500 raters. Each rater ...
- 131
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57
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Error in lmerTest: The random-effects parameters and the residual variance (or scale parameter) are probably unidentifiable
I know that there have been similar questions before, but I dont still get it.
I would like to estimate a multilevel model with repeated measures in R using the package “lmerTest”. The model ...
- 11
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31
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Mixed effect model for two levels of repeated measures
I have a repeated measures dataset that I am attempting to analyze using linear mixed effects regression. I would like to compare the effects of different products (A and B) on a dependent variable (y)...
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0
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69
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Bread freshness in bread basket, Multi-Level Analysis in R; 2 time points [closed]
This is my first attempt with multi-level analysis.
My research question is;
How does the freshness of different types of bread (6 level) within a bread basket, change over two time points (ranging 4-...
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86
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untrustworthy p values? emtrends following lmms with fixed effects of different levels of repetition
Edited to clarify further 23/04/24:
I have a fairly complex linear mixed effect model in R and I believe that there are issues to do with repeated data when running my post hoc tests. The model ...
- 21
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1
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30
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Additional covariate reduces AIC in mixed models (LMM, GLMM, GAM)
In repeated measure for timepoints in different Group, Age and Gender act as a covariate in ...
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6
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2
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217
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exclude random effects component for a repeated measure
I'm analyzing a dataset on the Nurse Licensure Exam, comprising 3000 participants. (n)
These 3000 participants were randomly recruited from 13 Sites across the US. (group level variable)
About 40% of ...
0
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1
answer
123
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mixed effect model in R with unstructured covariance [closed]
For the longitudinal data provided below, we have the following variables: the response variable y, the time variable 'week', 'grp' (with two levels: grp1 and grp2), and 'subject'. My objective is to ...
- 1,183
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37
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How to specify mixed-effects using lme4 in r for a within-subjects experiment [closed]
Now I want to regress the overall quality of the ideas (DV) on the source interacting with a continuous variable. I was advised to use the lme4 package, but I am ...
- 11
2
votes
1
answer
98
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Mixed model that tests for within-subject differences between two conditions while including covariates
I would like to use a mixed model to test if the values in a response variable differ between two conditions that each subject underwent. On top, I would like to control for the influence of other ...
- 223
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1
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53
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Is repeated measures appropriate for testing for a difference in repeated paired group measurements?
I'm new to repeated measures and am trying to understand how it maps to lmer.
I have measurements from two time periods:
$t_1, t_2$.
At each measurement period, the same 50 different foods are scored ...
6
votes
1
answer
137
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Modeling repeated measures data in R - Interpretation and Validation
I am currently working on a control-case study where patients and controls are assessed at five different time intervals. The aim of the study is to assess possible differences in the response ...
- 381
2
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0
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139
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Equivalence test with random effects
I am designing an experiment where I will test different subjects’ multiple times under two different conditions (lab and real life)
My hypothesis Is that that the subject will perform equivalent in ...
5
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2
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107
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Repeated measures within participant
I'm trying to learn linear mixed effects models and how to estimate them using the R package lme4 and I am confused about some aspects.
I have a dataset where a ...
- 3,242
2
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2
answers
97
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lmer analysis for 58 people 4 timepoints, advice on setting the model
I’m looking for some advice on analysing this data. I think I need a multilevel model.
I have 58 participants measured progesterone and a factor at 4 timepoints. I would like to do a model to see how ...
- 121
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1
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40
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LMM for Repeated Measures tree ring chronology
Having my first go at R and stats.
I sampled and analyzed tree rings for different measures (width, density, etc.). There are 3 treatments, 3 plot per treatment, and 5 trees per plot. The ring time ...
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1
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42
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Physical model for multilocation RCBD with repeated measures in time
I am trying to write a model for an experimental design that looks like this:
There are 5 farms (A,B,C,D,E) , and each farm has a RCBD design with 2 treatments(1,2) randomized in 4 blocks in each farm....
- 79
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1
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103
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Repeated-measures regression in single subject design
I'm grateful for advice on which R analysis to choose for the following study:
I measured stress in one subject on 27 days in the night and in the morning.
Now I want to predict stress in the night ...
1
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0
answers
47
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How to conduct post hoc paired comparisons for mixed effects model?
I am working with some biological data where I am trying to compare 5 categories of genes by expression which occur at different loci (locations on the chromosomes). I have samples from different ...
- 255
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3
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655
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longitudinal data with unequal samples and end points
I've been asked to look at a dataset of repeated measures taken during exercise in participants under two conditions control and ...
- 133
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54
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In multilevel modeling, the problem of no variability in lower-level units nested within the higher-level unit
Suppose that an observational study was conducted with 100 patients (i.e., 100 level-2 units). The researcher recorded whether a medical condition was present (coded as 1) or absent (coded as 0) in ...
- 101
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0
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44
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Mixed model development for repeated measures over 3 years
I have longitudinal data for multiple plant varieties, where plants were measured for their Performance at 10 time points (time) each year for 3 years.
Each variety (genotype) serves as a distinct ...
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26
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Linear Mixed Model Looking for significant effects
Hello I'm currently doing data analysis of my study in R.
I'm having trouble with finding the right way to go about it though.
Snippet of my data:
...
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0
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125
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Seeking Appropriate Mixed Effects Model for Covariance Structure in Grouped, Repeated Measures Data
I'm currently working on a project where I need to identify an appropriate model that accurately fits the data generation process of my study. The goal is to have a model in which the covariance ...
- 613
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0
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18
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add variable occurs between measurements LMM
I am interested in adding a variable to a repeated measurements model, LMM (3 measurements of QOL). But unlike gender, for example, which does not change between measurements, the variables I want to ...
1
vote
1
answer
91
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Mixed effects model to explore the linear relationship between two variables for each level of the repeated-measures in Rstudio using lme()
Background: I did an experiment in which 30 people watched 3 movie clips ("A", "B", and "C") in a random order. For each song and participant I measured one continuous ...
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2
votes
1
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170
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Unstructured model vs random slope model for repeated measures based on R functions lmer, lme and gls
Here is the dataset for repeated measures:
...
- 777
1
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2
answers
455
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Mixed model with two fixed effects, with repeated measures for only one of them
I am using linear mixed effect models to study the effect of a physical therapy treatment on two different populations of patients (Adolescents and Adults). The treatment is the same for both ...
- 539
2
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0
answers
68
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How to deal with the rank deficiency in lmer for nested variable
Data and background of the study:
The data is a repeat measurement of metabolite levels in responses to 2 types of stimuli.
The data measured in 4 sessions— ...
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1
answer
64
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Testing assumptions for repeated measures ANOVA
I was wondering how to assess residual normality of a repeated measures ANOVA. In some threads, users refer to Venables and Ripley: Residuals in multistratum analyses: Projections and recommend to ...
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1
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74
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which LME model to use?
I am interested in learning whether a diet can help people lose weight. I randomly assigned participants to receive the new diet. Weight was monitored at baseline and again at the beginning of every ...
1
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1
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584
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Can lme4 fit a repeated measures model with unstructured covariance? How does it differ from fitting using gls in nlme?
I recently read this paper by Donohue et al. in Pharmaceutical Statistics (Open access: https://doi.org/10.1002/pst.2285). Mixed model repeated measure (MMRM) analyses are discussed. In particular, ...
- 266
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36
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lme4 subject-level random effect for repeated measures but subjects belong to two different groups reflecting fixed effect
I am analyzing effects for two different populations ('group membership') where each subject provided repeated measures. I would like to have the subject as a random effect given repeated measures, ...
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1
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74
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Repeated within family measurements in an lmer
I'm trying to model in R, how lizard head size (Continuous) can be predicted by mass (Continuous), hatch time (Factor: Early vs Late), and Clutch mass (Continuous), with Family as a random factor. An ...
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1
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143
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lmer model output interpretation [closed]
I'm trying to interpret the lmer model output.
In particular, I am trying to explain 'HU mean' with pathology (which has 3 categories Healthy - HC- VSD), gender (M-...
- 381
1
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1
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125
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linear mixed model with repeated measures
I am trying to wrap my head around linear mixed models for repeated measures with random effects. I'm choosing to conduct this type of model due to missing values in my dataset.
I am interested in ...
0
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1
answer
155
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Help with lmer formula for a repeated measures ANOVA
This is my first repeated measures analysis.
Subjects in two groups exercise until "peak" level. Blood is taken at baseline (prior to exercise), peak, 2hrs post, 24 hrs post, and 72hrs post. ...
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1
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0
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59
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Mixed Effects Model - Repeated Measures with considerable amount of missing data
I am testing differences in gene expression across four time-points and between treatment and control. In total, 50 individuals were recruited for the Treatment Group and 58 recruited for the Control ...
- 325
2
votes
1
answer
2k
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R - Model specification for repeated measures in linear mixed-effect model (lmer)
I am quite new in linear mixed-effects models, and trying to figure out how to properly design my model according to what I want to show (especially with the nesting and random effect). I am reading ...
- 41
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2
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339
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What should be normally distributed for a two-way repeated measures ANOVA? R
When running a two-way repeated measures ANOVA, should:
A) the independent varibles be normally distributed?
B) should the scores between the variables be normally distributed?
Overall: should the ...
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1
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1
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118
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How to specify a repeated measure in a Mixed Effect ANOVA?
I am trying to run a Repeated Measures Mixed Effect ANOVA in R. However, the syntax of the code is really tricky and it seems like there is not a lot of clarity on how to run it as I do my research.
...
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2
votes
2
answers
275
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Specify an lmer model for fully crossed data with replications
I have experiment data with multiple independent variables:
shape - 2 factors
color - 2 factors
...
- 217
2
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0
answers
26
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Using multilevel modeling to test differences in the ability of trait and state measures to predict outcomes
I'm currently trying to test whether trait is better at predicting overall/mean job performance than state anxiety and whether state anxiety is better at predicting daily job performance than trait ...
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2
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0
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62
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How to distinguish between measurement error and within-person variability in multilevel modeling/HLM
I'm currently running a model to determine if people vary in their daily levels of variable Y, and if daily levels of variable X predict daily levels of variable Y. I collected measurements of both X ...
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0
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67
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LMER returns errors, but Repeated Measures ANOVA on the same data doesn't, why?
everyone!
So, I've been trying to fit a LMER for my data, which I fully described in this post .
This post, therefore, is a follow-up from the previous one. There's something intriguing me, I don't ...
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0
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18
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How to assess whether study strategy affects slope of repeated measurements?
I wish to assess the effect of teaching strategy on improvement in grades (slope). For this,
I plan to conduct a study where students will be assigned different teaching strategies for their tests. ...
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2
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1
answer
37
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1
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1
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31
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Need help with analyzing data from within subjects design study
I am planning to conduct a within-subjects design study, and I am wondering if data analysis can be done using multi-level analysis.
IV and DV will be continuous variables. Moderator will be binary, ...
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1
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1
answer
752
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Random effects in linear mixed model (LME) with repeated replicates
My question in short
How to account for repeats of replicates of a full factorial design in lmer() of the lme4 package in R?
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