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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Two way repeated measures with baseline and multiple time-points

We have a repeated measures experiment. Each person had their temperature measured once before, and every minute (for 15 minutes) after two different interventions. As each of the two different ...
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Which statistical test : Anova or T-Test for between subject experiment (repeated measures ) with one IV with two levels( control and treatment)

It's a between-subject design with a control group and a treatment group with 50 people each. Each participant undergoes 100 trails. (repeated measures). So the only within-subject factor is the ...
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Organizing repeated measures data with a grouping variable for MLM

I just started reading about multilevel modeling so I can apply the method to my research data. However, I have yet to come across an illustrative example or even discussion how to organize and set up ...
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Statistical testing on discrete time series data?

I am trying to analyse some data which has 40 different subjects, 1 categorical factor with two levels (20 male and 20 female). The rate of tree cutting was recorded at 4 different time points for ...
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comparison between two measurement devices

I have two measurement devices accelerometer A and B. The measurement is the step time of a person walking in a corridor. A is the gold standard. I want to check the validity and reliability of B. how ...
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Does a mixed model make sense in this case?

Suppose I am modeling the sales by week for all 50 states in the United States for a beverage company and I want to see the effect of marketing on sales. Would adding a fixed effect and a random ...
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Test for unpaired data from the same population?

I have data from a 1 group repeated measures (Time 1 and Time 2) design to evaluate the impact of a psychological intervention for a group of participants. It is the same group of participants pre and ...
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45 views

Daily repeated measures with normalization

I have 2 Groups (Control and TRT, n=6x2) run in parrallel and I would like to highligh the potential effect of the treatement on variables (mydata[,ii]) measured daily (Day) during 80 days. If I ...
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Is this possible to fit a MMRM (SAS REPEATED) with compound symmetry or AR1 model with glmmTMB?

MMRM (Mixed effect Model Repeat Measurement) models are special cases of the mixed models, where no random effects are used, only the residual covariance is modelled. This is commonly used for ...
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How to carry out 3 factor repeated measures ANOVA in R? [closed]

I have 3 factors Search Type(Feature or Conjunction), Number of Distractors(4,16,32, or 64), and Target(Absent or Present)and I want to run a repeated measure ANOVA in R.
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Statistical Test for Staffing Agency Selection of Employees

I am looking for the statistical test to measure the selection pattern from a pool of people. The staffing agency receives requests from a contract and then selects a person to fill the order. The ...
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Research question: We measured heart rate variability parameters

In my research we measured heart rate variability parameters (4 different numerical variables) in 4 different situations in 50 subjects - newborns who were of different age. How to control the sample ...
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How to test for statistical significance with multiple visits and technical replicates?

I have a data set with 100 columns that's divided between 40 normal columns and 60 MI columns. Samples from each patient were taken at two separate visits, and each sample has two technical ...
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How to control for within-subject covariate in a single-arm, mirror image study design?

I have a mirror image study which consists of one group of subjects, and they have a measure before and another measure after an intervention. Depiction: Single group: Measure#1 -> (Intervention) ->...
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How to perform Repeated Measures MANOVA, with unbalanced design [closed]

I am analysing data from a vaccination study and I think that the best way to model my data is with a repeated measures multivariate ANOVA. Because I have different #'s of subjects in each study ...
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Sample size calculation with cluster randomization for within subjects design

I'm in the process of planning a two group between subjects experiment and I want to calculate the required sample size. As the population I want to examine is not very large, it is rather ...
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Mixed models for longitudinal data, coding of time

I have a repeated measures design where the main question is to test the differences between groups (3 levels) at specific time points. The data is balanced with 8 subjects per group and 7 time ...
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Adjust statistically for initial score when doing a survival analysis

I'm comparing the effectiveness of treatment on depression in a repeated measures study. I had asked some other questions about this earlier here. I want to use the survival analysis method to compare ...
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Test for different median in two independent groups with repeated measurements

I want to test if the median of a continuous variable (e.g. height) is the same in two independent groups (boys and girls). For each person there are multiple measurements of the continuous variable ...
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117 views

Mixed Effects Model

Sorry for asking my question even though I know there are some subjects about mixed effect model on the forum. But I think my question is somewhat different. I have to answer to a question about ...
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Is Pre (1 time point) - Post (2 time points) treatment analysis with linear mixed model (lmm) a reasonable technique to answer my research question?

I am facing problem in deciding the right analysis to answer my question. I have 98 subjects. Each subject was measured 3 times (Baseline Year, Year 1, Year 2) on treatment efficacy marker Albumin ...
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Multiple observations from the same individuals - can linear regression still work?

Consider a project in which you have 120 participants answering a questionnaire about perceived quality and perceived price of several variations of a product. Each participants gets introduced to a ...
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Order effects test for randomized stimuli

I'm trying to address a reviewer's comment about the 'development of expectations' for a within-subjects variable. In brief, one of the variables was varied within-subjects and the order of ...
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How to see the effect of a continuous moderator on a DV w/a 12x2x2 within-between subs factor setup?

We cannot figure out the most appropriate analysis, given our data. We conducted a 12 (morality of the behavior) x 2 (character type) x 2 (character role) experiment. Morality and role were within ...
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pingouin rm_corr for repeated measure ordinal data in python?

I have a similar situation to this question: Repeated measure correlation in Python Where I have repeated measures from participants since they fill out a questionnaire each day. I can use pingouin'...
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Insignificant two-way MANOVA results - what do I do next?

I am very very new to stats. I decided to try and do a MANOVA in SPSS, my between-subjects IV is gender and my within-subjects IV is the two conditions in which all participants took part. My DV is ...
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LSMeans for repeated measures using GLM in SAS

I would like to obtain LSMeans comparisons for the within-subject factors of a repeated measures model using GLM. Here is an example ...
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Test to examine difference

I am trying to investigate the prevalence of aggressive driving. So my objective is to see if the proportion of the aggressive trip (with at least one aggressive event) or aggressive trip per driven ...
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Comparison of repeated measure

I have driving-related data from 100 people for 3 months. I want to see if the driving miles from weekdays are different than weekends. As the sample is not independent I cannot use normal Chi-sq. Can ...
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118 views

How do I analyze the treatment effect while controlling for covariates in a pretest–posttest design in R?

I ran a repeated-measures ANOVA in R to look at the effects of treatment (3 different treatment groups), gender, age, and education level on a specific biomarker (continuous variable). The data is in ...
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Repeated Measures Anova with Independent Age groups

I am reviewing a paper and am looking for clarification. Apologies in advance, but I am making the study design purposefully vague to not reveal any sensitive information. In the study, the authors ...
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How to test for differences with multiple observations per subject under the same (level-2) condition?

I'm trying test for the difference in a numeric outcome (WearTime) that was measured 7 times (7 consecutive days) for each subject under the same condition (Season) that was measured at the ...
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Repeated measures with multiple kinds of repeats

I did a test where a had participants watch video's of animals. There were 3 animals (cat, snake, horse). For each of those animals we had a video in 3 different situations. The participants were ...
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Measure of association adjusting for varied number of observations per person (binary outcome and predictor)

I would like to ask a question about how to alter a model to deal with varied numbers of cases per person (1 vs. 2), or, if I should deal with it some other way, some suggestion around that. I would ...
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Is Two Way Repeated Measures ANOVA appropriate?

I've conducted a study investigating if an intervention decreases the number of violations a restaurant receives during an inspection. 50 restaurants are inspected, 2 months later they're given an ...
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How to analyze repeated-measures between-subject data using R?

I have to analyze data from an study with following design: I measure the subjects' response to a series of stimuli on a 4-level Likert-scale. Each subjects sees 10 different stimuli, but they are the ...
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How to run a nested RM-ANOVA?

I have some data in the following format: 4 conditions, within subject, multiple measurements per subject. Condition is the fixed effect, and subject is the random effect, which is nested into ...
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Interpretation of between subject factors from a Mixed Models Anova with non-significant within factor effect

I just received results from a 91(Electrode-Combinations) x 2(Groups) x 2(Condition) mixed model ANOVA design, where Condition is the the within-subject factor or more precisely the repeated measures ...
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When data is collected on different parts of the body, is the body part considered a within or between subject factor?

For a study I'm planning, I measure a property of vertebrae of subjects with a particular condition, and those without it. For each subject in this study, I measure that property on three different ...
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Calculating the coefficient of variation within pairs

I would like to calculate the coefficient of variation of an assay where I measured each sample in duplicate. I have no statistical background but from my understanding I would need the standard ...
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How to solve autocorrelation and convergence warning in GLMM (lme4)

I’m trying to use linear mixed model (random intercept and slope) to investigate if these factors have an effect on response variable (BL in the model) over years? ...
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How to Analyze Frequency Data with Between-Within Factors

I'm trying to analyze data from an intervention study that has 70 participants separated into two groups (Control and Intervention - Between Subjects) and looks at pre-post data (Within Subjects) The ...
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Relationship between repeated measures ANOVA and random / mixed effect models

This is not concrete question but more a conceptual one, although a pretty low-level one I guess: When I was taught ANOVAs the 'classical' sums of squares way, I was told that repeated measures can ...
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Advice needed with hypothesis testing of experiment with crossover design

I have conducted a randomized, single-blinded experiment, stimulation vs sham, two-session, within-subject, cross-over design. In each of the experimental sessions, participants alternately received ...
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Model for Panel data with correlated time-invariant variables

after days of reading, I start to get a feeling about the different assumptions, tradeoffs and such for different models. But I still can't find the right answer. I asked a question about the choice ...
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Is there a non-parametric alternative to Two-Way Repeated Measures Anova?

I am currently comparing the EEG funcional connectivity measured at 14 electrodes and 4 frequency bands between highly and lowly hypnotic susceptible individuals. I extracted the coherence and the ...
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Take paired data into account in lmer mixed model

I would like some help with setting up a linear mixed model with paired data. I have a dataset where each participant is tested twice: either with a manipulation or without a manipulation. There are ...
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Prewhitening nested data

I am studying daily associations of pain and physical activity for 10 individuals. I will split the data by individual when conducting the regressions. Do I also need to split the data by individual ...
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Should I use a GEE model for a mixed logistic regression problem with a multinomial outcome?

I'm trying to model linguistic data where my hypothesis assumes that a multinomial categorical response from a subject is a function of fixed effects (gender and subject's occupation, say) and, since ...
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inconsistent results in two-way repeated measure analysis using mixed models

I have two factors: interval with two levels, and spd_des with three levels. Each of the subjects (grouping variable ...