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.

learn more… | top users | synonyms (1)

1
vote
0answers
3 views

Appropriate analysis for three different measures of anxiety pre & post intervention

My study: To examine whether a self-talk intervention has an effect on anxiety. There are two points of measure, pre and post intervention. Anxiety was measured as Somatic anxiety, Cognitive anxiety ...
0
votes
0answers
7 views

Power Analysis for Within Subject ANOVA

I am going to be collecting survey data that asks for participants' attitudes towards four groups of people. For the sake of this example, let's say that it's black women, black men, white women, and ...
0
votes
0answers
15 views

Difference in Difference vs repeated measures

Hi I am trying to understand the difference between Difference in Difference analysis and a repeated measures ANOVA. My DiD data set is made up of 32 treated and 32 non treated subjects each with 2 ...
1
vote
1answer
49 views

GLMM or LME? Repeated measures help?

I am having trouble using the correct test and r code for my experiment. Essentially I measured insect emergence daily from artificial streams with 3 treatments.: ...
0
votes
1answer
20 views

Repeated measures analysis with participants measured across time and treatment groups

My data consists of people who chose either no treatment or treatment and were given a specific assessment at time 0, 1, 2, 3, 4, 5,... . Participants may miss an assessment but will still be ...
0
votes
0answers
16 views

Not complete repeated measurement for linear mixed effect model in R using na.omit

I have measured the effect of different stimulation types in a group of subjects and I am using linear mixed effect models in R to check the effect of each stimulation type. Let's say I have ...
0
votes
0answers
13 views

Should I use GEE, Multilevel or Cox regression?

I am interested in the relationship between the number of hours worked per week and the chances of getting an illness. My dataset consists of 47 subjects, the predictor variable hours worked per week ...
0
votes
1answer
21 views

How to test repeated, nested, count data

I have samples from an experiment in which I have counted cells. I took 2 pictures of each kidney, photographing both kidneys of each subject. Each individual belongs to a group (infection). My ...
0
votes
0answers
6 views

pre-post vs single measurement control group. Help!

I have been asked to help a PG student with statistical analysis of her data, and I am really struggling to know the best way forward. The design is unbalanced, and I am not sure if there is a way ...
0
votes
0answers
14 views

Comparing Two Count Variables Within-subjects

I have data where I asked participants to list 5 people that they thought fit a particular category. We then coded whether the people were men or women and counted the number of men and the number of ...
0
votes
0answers
38 views

A model for repeated treatments and repeated outcomes

I have the following data: Measurements of kidney function (in units called GFR) taken at several time points pre-operation (not evenly spaced) and at several time points post-operation. Here's my ...
0
votes
0answers
17 views

Mixed model with clustered and repeated-measures data

I'm analysing the results of an experiment using a mixed model. Reaction times for each subject (40 male and 40 female) to 8 stimuli have been registered. The process has been repeated on the same ...
0
votes
0answers
8 views

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: ...
0
votes
1answer
23 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 ...
0
votes
0answers
28 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 ...
0
votes
0answers
9 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 ...
0
votes
0answers
20 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 ...
1
vote
0answers
19 views

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 ...
0
votes
0answers
12 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. ...
0
votes
1answer
18 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 ...
6
votes
1answer
158 views

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 ...
0
votes
0answers
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 ...
0
votes
0answers
13 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 ...
0
votes
0answers
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 ...
0
votes
0answers
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 ...
0
votes
0answers
14 views

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 ...
1
vote
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 ...
0
votes
0answers
25 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 ...
0
votes
0answers
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 ...
0
votes
1answer
39 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 ...
1
vote
0answers
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 ...
0
votes
1answer
25 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 ...
0
votes
0answers
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 ...
1
vote
0answers
26 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 ...
0
votes
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 ...
1
vote
1answer
12 views

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 ...
0
votes
0answers
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 ...
0
votes
0answers
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. ...
0
votes
0answers
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 ...
0
votes
0answers
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 ...
0
votes
0answers
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 ...
0
votes
0answers
7 views

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 ...
0
votes
0answers
25 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 ...
0
votes
0answers
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, ...
0
votes
0answers
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 ...
0
votes
1answer
68 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 ...
1
vote
0answers
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 ...
0
votes
0answers
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 ...
0
votes
0answers
12 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 ...
0
votes
0answers
9 views

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 ...