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)

0
votes
0answers
17 views

Modelling time invariant variable as a random effect

I have a data set that consist of one-year claim information of individuals. Individuals can have zero claim, one claim and more than one claim in a year. Generally they have more than one claim and ...
1
vote
0answers
5 views

Discrimination between measurements made at different points in time

I would like to ascertain what variables discriminate best between experimental conditions in a repeated-measures experimental design. I have performed Repeated Measures MANOVA to determine whether ...
0
votes
0answers
5 views

Repeated measures ANCOVA - heterogeneity of slopes

In my 2x2x2 mixed model ANCOVA, the covariate is interacting with only one of the main effects (repeated measures). Would it be OK to interpret the rest of the effects and interactions (which were not ...
0
votes
0answers
20 views

One-way ANOVA: Concluding one true differences without any post-hoc tests?

Let's say that I run a one-way ANOVA with 3+ levels and that it comes out significant. Can I then, from this result alone, conclude that at least the two sample means that differs the most in my data ...
0
votes
1answer
18 views

How can I interpret a significant one-way repeated measures ANOVA with non-significant pairwise, bonferroni adjusted, comparisons?

I have a dataset with one factor consisting of four levels. I've run a one-way repeated measures ANOVA on the data, which came out significant. However, for the follow-up pairwise, bonferroni ...
0
votes
0answers
12 views

Association between two binary (yes/no) within-subjects variables

I want to examine the association between two binary variables (within-subjects data) but I'm not sure which test is most appropriate. Specifically, we asked participants if they had ever used a ...
1
vote
1answer
16 views

Repeated Measures ANOVA with randomly presented stimuli?

I currently have data that looks at participants receiving 10 stimuli successively, but the order the stimuli are presented changes with each participant. What type of analysis should be used to look ...
0
votes
0answers
3 views

How to analyse a longitudinal study with control and intervention groups, where the outcome is continuous but was right-truncated at baseline

A longitudinal anemia study right truncated hemoglobin levels at 12 mg/dl at baseline, limiting to only anemic participants (with hemo levels <=12). These participants were then divided to control ...
0
votes
0answers
26 views

How to Analyze Likert scale data in a design with between and within group comparison [closed]

I have 7 point Likert scale data from a somewhat strange experimental design: - 3 conditions (2 conditions measured within participants, the third one in a separate smaller group of participants) - ...
3
votes
0answers
45 views

Study on both hands of patients, mixed effects?

We want to test the correlation of a certain surgical procedure on the hand (carpal tunnel) and the development of trigger digit. We have both hands of the patients, some hands underwent surgery, ...
0
votes
0answers
6 views

repeated analysis with a covariate + slice [closed]

I have to perform a repeated analysis with a covariate. I used the afex package to perform a mixed analysis. Now, I would like to have the group effect at each frequency but I don't know how to ...
0
votes
1answer
10 views

Should I center time variant predictors in repeated measures multilevel models?

I have a multilevel model built coinsidering repeated measures on students. Students performance may vary depending on study hours and tutoring hours before each exam. Should I center the predictors ...
0
votes
1answer
13 views

paired samples (t-test?) with grouping variable

Im trying to determine the correct analysis for paired data with a grouping variable. I have 3 fish in each of 4 treatments, so 12 fish in total. Treatments are that the fish are fed at one of four ...
0
votes
0answers
22 views

Repeated measures for more than one variables

I wish to check if the covariate IVs $X_1$, $X_2$, $X_3$, have a significant effect in the way that the DVs $Y_1$, $Y_2$, $Y_3$ differentiates over time between two time points (2012, 2013). I have ...
1
vote
0answers
17 views

Repeated Measures Analysis for a Single Treatment with Missing Data

I have some data here that I am at a loss on how to analyze. The following data set represents a subset of some data I have where a number of subjects (4 here, about fifty in the actual set) ...
0
votes
0answers
15 views

How to analyze nested, repeated and unbalanced questionnaires where the outcome is binary?

Background: My data was collected once a year for 6 years using the same questionnaire. All responses have a person-specific ID. 18 554 responses from 5 654 unique persons were collected from 7 ...
0
votes
0answers
8 views

Help to determine correct statistical test for repeated measures, differing treatments in same subject experiment

Our hypothesis is that treatment 1 changes our outcome measure by some amount, and that treatment 1 combined with treatment 2 changes our outcome measure by a larger amount. For each subject, the ...
0
votes
0answers
8 views

How to include replicates in linear mixed models in SPSS?

In my study I had 11 radiocollared hares which i gave 3 different treatments. one treatment was the release of stressed hare sounds in combi with red fox sounds, the second treatment was sheepsound ...
0
votes
1answer
21 views

Mixed model analysis: random vs repeated statement

I have data from a longitudinal parallel groups study where there are 46 subjects randomized to 1 of 5 treatment groups, each subject with roughly 13 observations over time on a given outcome measure. ...
0
votes
0answers
8 views

Which type of test is better to compare difference of one independent variable (3 groups and one control) on a repeated measures experiment?

I have a group of 100 classroom participants, all who have taken a course that included four different lessons (from a single unit). Three lessons were taught each using a different form of ...
4
votes
2answers
118 views

Is it correct to model percent change as a continuous variable?

I have data from a longitudinal study where there are 46 subjects, each with 13 observations over time on a given outcome measure. A prior analysis conducted on this data performed a linear mixed ...
0
votes
1answer
14 views

Which method is suitable when the independent variables are of process steps over time and the dependent is binary?

I'm quite confused with some methods I've read about - growth models, repeated measures, time-series fixed effects models etc. I'm trying to understand which method is most suitable to the data I ...
0
votes
0answers
11 views

multiple repeated within subjects pre test measurements in fully crossed design

Which statistical test should I use if my design has a baseline pre test for 3 treatments? Each subject gets all 3 treatments each on different days. Each day has a pre treatment baseline measure. ...
0
votes
0answers
11 views

Which is the difference between conventional 2-way repeated measures ANOVA and mixed effect ANOVA?

Assuming I have two within-subjects factors (Xw1 and Xw2) for my experimental design I can therefore perform two way repeated measures ANOVA using the conventional procedure in R ...
0
votes
0answers
20 views

How to determine correct statistical test for repeated measures, differing treatments in same subject experiment

Our hypothesis is that treatment 1 changes our outcome measure by some amount, and that treatment 1 combined with treatment 2 changes our outcome measure by a larger amount. For each subject, the ...
1
vote
0answers
26 views

Ordinal logistic regression model set-up for repeated measures

I have been looking for a non-parametric equivalent to a 3-way repeated measures ANOVA, and most of the sources I've read recommend using ordinal logistic regression. My ANOVA model had 3 ...
0
votes
0answers
6 views

how to analyse an interaction in a within-subjects repeated ANCOVA post-hoc?

I have pre and post measures of attention that I am examining in a within-subjects repeated measures design. I wanted to check the effect of verbal intelligence [VIQ] on my attention[pre/post] ...
0
votes
0answers
10 views

Testing ordinal response, repeated measures

I am interesting in modeling an ordinal response variable with a number of covariates, both discrete and continuous, as well as time-dependent and fixed. Normally, I would use an ordered logistic ...
1
vote
0answers
30 views

Repeated measures ordinal data analysis SPSS

I'm looking to run an analysis using ordinal data with a repeated measures design, and could do with some advice on how to do so. I'm looking at whether or not extra curricular activity changes after ...
0
votes
0answers
14 views

repeated measures-two way anova on 1 factor ou both?

I need to do a two-way ANOVA on my data (or at least I think it is the best test), but I'm confused about weather to chose repeated measures on just one factor or both. Experimental design: 3 mice ...
0
votes
0answers
24 views

Multi-Level within factors in repeated measures ANOVA in SAS

This is a brief sketch of design containing both within and between subject factors. There are two groups. (each 10 subjects). Each subject responded many (over 600) trials. The trials are one of ...
0
votes
1answer
67 views

Random effects for within subjects study in R

I have data which consists of subjective ratings. The ratings are done by different judges with each subject being judged under different experimental conditions. Each subject undergoes each ...
0
votes
1answer
24 views

Suspicious 3-way repeated measures ANOVA results

I'm getting weird results using the fitrm and ranova functions in Matlab. I've asked a similar question in the Matlab forums. The table below is part of the results for a 3-way repeated measures ...
0
votes
0answers
3 views

What does the number of measurements refer to for a repeated measure MANOVA or MANCOVA?

I am using GPower to calculate the required sample size for a MANCOVA test. GPower doesn't list MANCOVA as an option in the F-Test family. Repeated measures MANOVA, within-between measures is listed ...
1
vote
0answers
12 views

Repeated measures ANOVA with custom standard errors

I want to see if there's a difference in size of some cells after several measurements, compared to a baseline (0.5, 1, 3, 6 hours versus 0 hours). I have 3 samples. Each measurement is actually a ...
1
vote
2answers
72 views

How can I model a binary outcomes in time series using logistic regression?

My data has a binary outcome (attack or not attack), day (20 day in repeated measured design) and some covariates (nestling’s movement). The objectives of my experiment are testing the effect of time ...
5
votes
3answers
86 views

What statistical test should I use to look at change in a binary outcome over time?

I am designing a study that will look at medication adherence for HIV+ mothers at 6 weeks and 6 months postpartum. The adherence measurement is binary (1= adherent, 0= not adherent) so I will end up ...
1
vote
0answers
69 views

Is there a way to do a statistical test if an independent variable has only 1 level?

I have a repeated measures design in which I tested multiple individuals with three different sounds (playbacks). The playbacks were 20 seconds in length and I recorded 1) how individuals responded ...
2
votes
0answers
69 views

Mandatory participation vs. random assignment

Can I make a statistical inference about the effect of a training intervention on a population of employees if participants are not randomly assigned to participate in the training but required to ...
0
votes
0answers
9 views

Type of Analyses for Pre and Post Test Study

I have three dependent variables, all continuous that I am measuring before and after a treatment intervention. I am planning to do a MANOVA but get confused with how to input variables and factor ...
0
votes
0answers
5 views

How to test correlation of two variables from four repeated measures of each one among four groups

I have four plots from where I took a measure of two indicators of population abundance (as continuous variables) throughout four surveys (say, at spring 2010, fall 2010, spring 2011, fall 2011). So, ...
2
votes
1answer
41 views

How to use ANOVA with two or more data points per condition per participant?

I'm preparing my first ever experiment for my PhD and am currently facing some difficulties with statistics. Here is my draft experimental design: 3 factors with 5, 3, 3 levels. As a result I have ...
0
votes
0answers
12 views

Mixed within-between ANOVA or MANOVA? [duplicate]

I am doing a research, the instrument of which is an English proficiency test that consists of two parts: one part is related to the test-takers' field of study and one part is unrelated. my ...
1
vote
0answers
20 views

Non-Parametric ANOVA: Repeated Measures with Replication

I'm struggling to find out which ANOVA test to use when you have a non-normal data set with repeated measures AND replication. I'm doing my data analysis in R and the friedman.test() method says it ...
1
vote
0answers
41 views

Using G*Power to determine the sample size for an repeated measures ANOVA

I am currently designing an experiment that I want to analyze using an RM ANOVA. Since some of the factors are confounded I need to do multiple ANOVAS. One analysis will be for 2x2 factors (within ...
1
vote
0answers
19 views

How to analyse the ratio of two continuous variables sampled repeatedly over time

I am measuring reproductive hormones in dolphins over time to look at seasonal changes. The sample type (respiratory vapour) that I am using suffers from variable water dilution that cannot easily be ...
5
votes
1answer
183 views

Is using error bars for means in a within-subjects study wrong?

I seem to recall one of my professors saying that error bars are completely uninformative when comparing repeated measures taken from a single group. Is that true? Surely many studies compute the ...
3
votes
1answer
103 views

modelling time as continuous vs. discrete

I am writing an analysis plan for data that is collected on approximately 30 people at approximately 5 unevenly spaced time points. I am planning to analyze the data via a repeated measures mixed ...
1
vote
1answer
55 views

How to test whether people remembered more items given an intervention administered within subjects?

I have 20 individuals who memorised 5 lists of information. They immediately recalled the information, then at the end of the day either received an interventional 'cue' or nothing prior to recalling ...
0
votes
0answers
32 views

Interaction between continuous predictor and repeated-measures factor in R

How can I test for the presence of an interaction between a categorical repeated-measures factor and a continuous predictor? I'm using R. My data looks like this: ...