Repeated measures data occurs when more than one measurement is collected on the same unit (e.g. subject). This data cannot be analysed through normal methods because the rows in the data are not independent due to the multiple measurements. The time sequencing of the measures may not be important.

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Random effects structure for within-subject / repeated measures design in glmer

This post is somewhat related to this one, however with another focus. I have repeated measures data of plant species richness with the following variables: ...
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1answer
20 views

Assessing Repeatability of a Multivariate Measurement

I have a measurement that was taken 10 times on a sample. The measurement has roughly 11K points. If you're curious, I'm looking at mass spectrum data. I want to determine the repeatability of the ...
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27 views

Repeated measures, random effects structure, confidence intervals and p-values don't fit

I have repeated measures data of plant species richness with the following variables: richness (response variable measured each ...
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8 views

Which test for unbalanced, repeated measures in GenStat

If I have a group of animals and I weigh them at 5 different time points but on the last weighing only half the animals are weighed, how do I compare the mean weight at each time point? And doing all ...
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19 views

Probability of Red in a roulette after 100 blacks [duplicate]

Ignoring the 00 in a roulette, there is a 50/50 chance to get the ball on a Red result. Even after 100 times it's Black the probability will be the same. However, if I were to bet on the next one, it ...
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How to report my repeated measures analysis?

I've conducted an experiment with 30 participants using a counterbalanced design they performed a task in two slightly different conditions. After both conditions participants were asked to fill in a ...
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11 views

Repeated Measures ANOVA or multi-way ANOVA - longitudinal data (SPSS)

In my project, we are "tracking" students' attitudes across three years using a Likert survey, with 5 sections. Students complete a pre- and a post-survey at the beginning and end of each year. ...
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1answer
17 views

Paired test, unknown sample identites

I have data in which I have repeated measures on samples (at different times), but do not know the identities of the individual samples at each time point. Just for some context, I'm doing behavioral ...
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Box-Cox transformation for repeated measures ANOVA (rANOVA) in R

My proposition of the solution Perform Box-Cox-transformation despite of knowledge that obeservations are nont independent and then use rANOVA to estiamte coefficients using the knowledge that the ...
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24 views

How to analyze repeated measurements with categorical/ordered outcomes

I have the following dataset: 100 indiviuals (id) Each individual with 4 measurements at 4 timepoints time1,time2,time3 and time4 Outcome is a categorical or ordered variable 1,2,3,4. I simulated ...
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12 views

How do I compare a continuous response variable across three levels of an IV at multiple time points when the IV is not fixed?

I'm proposing a project for a longitudinal data analysis class (it's about repeated measures ANOVA, GEEs, etc), but I'm a little stuck in choosing the correct analysis for my data. I have 20 years of ...
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23 views

Repeated-measures ANOVA vs. Friedman-Test (normality?)

I've four (paired) datasets consisting of 43 rows and want to check if there is statistically significant change between those groups. To see whether a repeated-measure anova or it's non-parametric ...
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13 views

Two way ANOVA with repeated measure v.s. Linear Mixed Model (in R)

The study design is like following, there are in total 8 subjects (A - H). A-D are female and E-H are male (gender). A-H all do exercises. We measure ...
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Sample size for within-subject experiment

I plan an experiment where I want to test how tweaks for a mechanic system affect on performance of the person who uses the system. For the experiment I need to define a sample size. I choose the ...
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1answer
37 views

Test if number of fish differ by location

I have a dataset which consists of location ID's (1 to 29 different locations) and each location has a couple of repeated measures (max n = 780, min n = 50). Each measurement consists of a number of ...
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24 views

Cochran-Mantel-Haenszel test for before after data? Or something else?

I'm trying to assess proportional vegetation area change over time. I would like to test whether the area of trees has decreased significantly within different areas between two time periods ...
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13 views

How can I compare two measurement technics of the population whose results are expressed in different scales?

I have a single population and applied two different techniques measuring the same molecule. One gives me concentrations and the other one gives luminosity. Is there a way to compare these two ...
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1answer
37 views

Is a mixed model including repeated measures is appropriate for me, and how to interpret it?

I have a repeated measures study including 370-ish people measured twice on all variables (var1 to var6, including exposure variable), with some subjects who didn't complete the second assessment yet ...
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14 views

The Friedman's test

I have conducted research on the impact of toys on reading comprehension among primary school children. I have tested the strategy with three types of English language learners; good, intermediate and ...
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1answer
22 views

What is the benefit of using repeated measures in a mixed model vs. running a general linear model on the average of the repeated measures?

I have a dataset with protein measured twice from the same individual at three different timepoints. The data also includes the mean protein measure (the mean of the two repeated measures) for each ...
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10 views

analysing improvement in ordinal score in a group before and after an intervention

I am looking for direction in how to analyse ordinal data in a sample before and a sample after an intervention. I have performed an audit of safe drug syringe labelling practice in surgery before ...
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25 views

Which statistical method should I use to compare test results of two groups with each other and with exact values?

I am currently working on an in-vitro medical device for an academy project with my teammates to see if our approach to a certain problem is working. We are hiring two groups of volunteers (15 people ...
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1answer
13 views

Pretest scores differ amongst groups

In my analysis I compare 3 treatment groups with a pre- and posttest (emotionality scores 0 - 100), so I want to use the repeated measures. Unfortunately, the pretest scores differ significantly ...
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1answer
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Evaluating a pretreatment predictor with repeated measures ordinal data

I am currently attempting to study whether particular baseline factors predict pre/post changes in relation to a substance use intervention. However, a few things have me stumped. Our substance use ...
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11 views

Using multiple imputation followed by repeated measures

I have missing data that I have done multiple imputation with. I want to then use the means or 'pooled' data from the five imputations to do a repeated measures ANOVA. It seems I can't do this in ...
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24 views

Repeated measure with block design

I have a set of data with a full factorial randomized block design, were fertilizer and irrigation are my between-subject terms. ...
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32 views

Two-way repeated measures ANOVA

The study is blinded and every participant has to perform a 1000m cross country running test on: a) high altitude while simultaneously intaking a beet root drink b) high altitude while simultaneously ...
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24 views

Plotting data from a mixed repeated-measures design: Normed means necessary?

I want to plot data from a 2 X 2 mixed repeated measures design (one within-subjects factor, one between-subjects factor) using ggplot2. On ...
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15 views

What test to use for non-parametric repeated measures data?

I've been having trouble finding the correct test to use for my data. I measured the response of subjects to two treatments across three different time periods (e.g. beginning, middle, end). I want to ...
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Test for variance homogeneity and dependent samples

I have the following question regarding statistical tests for an fMRI phantom (i.e., roughly speaking a standardized object (e.g. cylinder filled with gel) used to make inference e.g. on properties of ...
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24 views

Non-parametric repeated measures with replicates: Wilcoxon Rank Sum Test or Wilcoxon Signed Rank Test?

We want to assess the suitability of 2 devices A and B for performing a test task on a set of subjects. We use a quantitative measure to evaluate performance (i.e., time to complete the task). We are ...
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16 views

Calculate within and between group correlation

MY DATA: A surveys which contains 2 different questionnaires on the same subject which were taken by n=800 patients (i.e., timepoint) (#1 questionnaire: 5 questions which reach a total score of 0-42, ...
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16 views

Which test to use for matched case-control setting with repeated measures and a continuous outcome?

I apologize if this question has already been answered in the past; I was unable to find a similar setting by searching. I have a study with 2 groups (rare cases and their siblings, N=13+13). Each ...
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1answer
67 views

Crossed fixed effects model specification including nesting and repeated measures using glmm in R

Background: I am interested in looking at the effects that Culture, Treatment and Time ...
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27 views

Choosing test to compare biological measurements at three timepoints

In my study design, I'm measuring concentrations of different mediators at an acute event (time 1) and at two follow-up timepoints (time 2 and time 3). My main question is whether the concentrations ...
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23 views

Within-subject repeated linear mixed-effects design in lmer

I would like to know more about the correct way to specify a within-subject repeated measures LME. In the study, participants (id) saw videos of 4 different conditions (each participant saw all 4 ...
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11 views

Should I use repeated measures ANCOVA for single group study?

in my study I have only one treatment group (no control group), and I want to examine the changes of three DVs, so I have a pre, middle, and post surveys, and the presurvey was administered before the ...
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Measure T1 to T2 improvement

I want to measure whether individuals can improve the quality of their self-assessment of a particular characteristic. At Time 1, research participants and their objective observers will complete the ...
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1answer
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1 dependent variable - 2 independent variables (1 matched, 1 independent groups)

I have the results from a test (dependent interval variable) applied to a group of patients. These were divided in group A and B based on the type of admission (independent variable 1). Each patient ...
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1answer
43 views

lme versus aov repeated measures variance specification

I am performing a repeated measures ANOVA in R, where the experimental design is composed of a between-subjects factor (Prodotto, three levels), the within-subjects ...
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9 views

Using multiple regression with repeated measures/questionnaires?

In two questionnaires, we have measured whether participants judge behaviors as moral in regard to whether they either affect or relate to an outgroup or affect an ingroup (i.e., the target changes in ...
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2answers
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The same participants completed survey three times, how many cases do I have?

I have total 22 participants in my treatment group, I have three DVs, and I asked my participants fill out the survey three times (beginning, middle, and the end) throughout of the treatment. I want ...
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Repeated measures with binary data

I've deigned an experiment in which participants read 24 narratives and guess if they are written by men or women and rate their own confidence. I thus have 24 binary repeated measures. I have the ...
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17 views

Parameter Estimates in Repeated Measures

I'm totally clueless whether I'm doing this right. What I did was the collect the following measures, it was a within subject design. I'm not sure whether to run with MANOVA or Repeated Measures ...
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Type of anova needed to examine *between* repeated measures but *within* only one of the repeated measures groups?

I have 6 plots that were resampled in 2 separate years for soil data. In the first year, 5 subsamples were taken in each plot, analyzed and then averaged to get a plot average for each variable in ...
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42 views

Relationship between linear mixed model assumption checks and repeated-measures ANOVA assumptions

Based on a previous question that I asked about checking assumptions of repeated-measures ANOVAs in R (which turns out to be not so trivial), I'm wondering about the relationship between a ...
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Test two groups that have before and after data

I have a dataset with a treated group vs. a placebo. Within each group there is a before and an after measurement. To test for a difference of the treatment between the groups, I though that a ...
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1answer
32 views

Suggestion for how to analyse groups of data with 4 attributes

In my final project for Data Mining course, I chose to analyze IMDB movie data. So far I have constructed a data set with all the movies until 2005. There are 24 movie genres and each genre has ...
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Repeated-Measures ANOVA: how to locate the significant difference(s) by R? [closed]

I am trying to use R to run Repeated-Measures ANOVA. Based on the data from: https://www.youtube.com/watch?v=VPB3xrsFl4o&list=PL568547ACA9211CCA&index=75 ...
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How to enter the dependant variables of Repeated Measures in Multiple regression?

My study is to investigate the effect of energy density (ED) and portion size (PS) on the intake of food among 12 - 16 years old female students. There are two levels of ED (High and Low) and PS ...