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
1answer
16 views

What statistical analysis is appropriate for a before and after design (where participants are not necessarily the same people)

I am trying to figure out what is the best statistical analysis for my data. I looked at two companies in timepoint 1 (baseline) and timepoint 2. Company A did an intervention, Company B did not ...
1
vote
0answers
11 views

Mixed Model with repeated measures

first off all, excuse my English; it's not my primary language. I'm watching water table recharge and salinity because of Land Use Change in semiarid system. I´m particularly concerned with the ...
1
vote
1answer
11 views

Mixed between-within subjects ANOVA

I am wondering how interpret tables. I used a mixed ANOVA for analyzing: My within-subjects factor is time (pretest, posttest, follow-up) my between-subjects factor consists of conditions ...
0
votes
1answer
46 views

mean of repeated measures…spot the (matlab) error

I have a population of 114 subjects. For each subject I have repeated measurements (1 each day) of the variable assessed (activity level). The number of measures varies for each subject (number of ...
1
vote
1answer
21 views

Bland & Altman plot for repeated measures using one measuring device

I am examining the reliability of a measuring device by measuring a force generated på test persons 7 days apart using R. In order to assess this properly I want to make a Bland & Altman plot ...
0
votes
0answers
7 views

Adding one measure to repeated measures data and assessing the fit

Let´s say I have a data set which includes patient reported outcome measure (PROM), ie. pain, for 100 patients and PROM is assessed six times with a questionnaire with a 1 month interval. The ...
1
vote
0answers
16 views

Multinomial response with repeated measures

I'm studying how sex influences habitat use. I'm looking for suggestions on how to analyze a repeated measure design with a multinomial response variable. I should note that the number of repeated ...
0
votes
0answers
20 views

Multilevel model to analyze limb injury data in Elite Athletes

I have a dataset of muscle activity measurements (variable name = RMS.mean) from a control group and an ACL injured group of elite ski racers. There are 11 ACL subjects and 12 controls. These ...
0
votes
1answer
13 views

Sort of repeated measure (that will be constant with one switch)

I cannot be specific about the data because it is proprietary. However, suppose we have data for a large number of customers for about 150 consecutive days. On each day, each customer can decide to ...
0
votes
0answers
11 views

Statistical test for unordered repeated measures under same conditions

I am unable to find the correct statistical test for the following scenario. We have a recording session with 4 subjects. For each subject, we make 8 recordings in 2 different speaking styles, let ...
0
votes
0answers
15 views

Bootstrapping effect size measures in a repeated measures design

A journal that people in my lab are submitting to asks for confidence intervals for effect size measures. We have a $(3) \times (3)$ design where each subject completes 3 blocks of trials, containing ...
0
votes
0answers
12 views

How should I build my quadratic mixed-effects model for repeated measures for gauging the effect of time?

Multiple subjects were each exposed to an event. I measured a hormone 12 times (-60, -30, -10, -5, 0, 5, 10, 20, 30, 40, 50, 60) Time (minutes) is centered around the onset of the event. We know the ...
0
votes
1answer
28 views

How to calculate ideal amount of reps needed for good average in R

Basically, I have some samples I'm processing to get moisture results on and I want to get a good average on the readings based on the ideal amount of repetitions. Duplicates is not enough and 10 ...
0
votes
0answers
9 views

Evaluating reproducibility of more than two replicas

I'm developing a DNA sequencing-based method, which generates a lot of quantitative data. To illustrate my case, the method provides the number of times an individual mutant of a gene is observed, for ...
0
votes
0answers
13 views

Repeated measurements, Random factor vs Interaction

I was asking myself, if i have a sampling design with field plots of e.g. three categories (A, B, C) having three replicates each and I'm going to take samples in two consecutive years, i.e. in ...
0
votes
0answers
10 views

Time varying covariate in within-subject factor

A researcher will collect data of dependent variable Y (from 100 subjects). Variable Y is continuous and reflects consumption measured in grams. The dependent variable is measured at three occurrences ...
0
votes
0answers
20 views

how to model a repeated measures anova equivalent using lmer?

I am trying to compare means of reaction time scores for patients tested at time1 (pre-stimulation) and at time2 (post-stimulation). Also, within the stimulation paradigm, patients either received ...
0
votes
0answers
35 views

Help regarding multiple regression with repeated independent variable measurements

I've spent a fair amount of time looking at previous posts related to my question. However, I've been unable to find a discussion that fully captures the difficulties I'm having - either because it ...
0
votes
0answers
8 views

Under what circumstances would a covariate with an odds ratio of 1 show up in my best model?

I have performed a random effects repeated measures logistic regression for my research. One of my covariates consistently has an odds ratio of 1.000 and a negligible coefficient (<0.00001), yet it ...
0
votes
1answer
22 views

Correlation over time in a group of subjects with repeated measures

I have a dataset on two disorders, one measured on a continuous scale, and one with three categories (which can be collapsed into a yes/no variable if necessary). The two disorders have been measured ...
1
vote
1answer
33 views

How to analyze crossover trial with a scale as outcome variable?

I'm working on a pilot study for a new drug. We will use a crossover design in which half of the patients will be given the drug for the first 6 weeks, then, after a washout period of one week, they ...
0
votes
0answers
24 views

Mixed-effect or multi-level model (or other) for multivariate repeated-measures data? [R]

I have a dataset consisting of: 2 groups of plants (Group 1, Group 2) living in 10 different neighboring fields (...
1
vote
1answer
25 views

Modeling repeated measures of cross-sectional county level data

I'm currently preparing an analysis project and am wondering people's thoughts on how to best model these data. I have 8 waves of data from a statewide random sample of 6, 8, 10, & 12 graders that ...
0
votes
0answers
10 views

Correlating Repeated-Measures from different conditions in a single relation

I have 29 respondents, each with 6 trials, each trial in a different condition. I measured per trial: correct, experienced complexity (1-7) And I measured once per respondent: Task Proficiency (1-7) ...
1
vote
1answer
19 views

Repeated measures between treatment and control to assess difference and influence of time

I have been using a between-subjects repeated measures ANOVA for data of treatment effect where different subjects provide data that vary by time, i.e., each subject has a reading for ...
1
vote
2answers
39 views

How to compare binary responses among six conditions where each respondent was in each condition?

I have the following data: There are three conditions, A, B and C (presented in random order). Each condition has two difficulties (i.e., six total). Each respondent is scored as 1 (if correct), or 0 ...
0
votes
0answers
49 views

Poisson Distribution Analysis in SPSS - Nonparametric, count, repeated-measures data

In relation to a recent post about what analyses to conduct for a data set, I am now asking a related question about the test to run in SPSS. Background information on the data: Repeated measures ...
3
votes
1answer
110 views

Non-normally distributed data - Box-Cox transformation?

I have data that is not normally distributed. The problem seems to be that there are too many of one value relative to other values. What I have tried to make data normal: I have tried a log ...
1
vote
1answer
32 views

Can I do a Binomial test on more than one individual/group? Can a repeated t test have different sample sizes?

I've conducted an experiment on chickens, training them to associate either blue or yellow with a 30 or 1 second wait before a food reward and then giving them a preference test, 15 times in total and ...
0
votes
0answers
8 views

How to analyse skewed and unskewed data on SPSS?

Study design: I have shown participants a series of photos of themselves vs. other people's bodies (original and manipulated), and asked them to find the original. Their responses were recorded and ...
0
votes
0answers
11 views

SPSS Repeated measure T-test for calculating efficacy of burning arrows

I was curious how effective the burning vs normal arrows are in the PC game Medieval II against heavy and light infantry. I have recorded some data in SPSS but now I cant get it to do a repeated ...
0
votes
0answers
25 views

Interaction effects by group in repeated-measures ANOVA

I'm running a repeated measures factorial ANOVA in SPSS, and I can't for the life of me figure out how to get the output that I need to answer my first hypothesis. I have two between-subjects ...
0
votes
0answers
21 views

Apply Sphericity Correction to all effects involing the violating factor?

I conducted a 4x2x2x2-repeated measures-ANOVA with SPSS,n=33. Mauchly's test for sphericity states that sphericity is violated for the first factor (W=0.688,p=0.43). The Greenhouse-Geisser-$\epsilon$ ...
1
vote
0answers
20 views

Multivariate repeated measures without between subject factors (Manova vs Anova)

I'm trying to run an analysis in SPSS on some EEG data, obtained with the following design: 1 within subject factor, 6 dependent outcome variables. First, I was thinking about a repeated measures ...
1
vote
0answers
36 views

How to analyze skewed and unskewed data on SPSS?

Study design: I have shown participants a series of photos of themselves vs. other people's bodies (original and manipulated), and asked them to find the original. Their responses were recorded and ...
2
votes
0answers
28 views

How to analyze my repeated measures data?

I have data on 200 subjects with baseline data and follow-up data after 1 and 2 years. The dependent variable is nominal: whether each subject lives at home, has passed away or lives in an institution ...
0
votes
1answer
20 views

How to run repeated-measures ANOVA when data points per subject vary?

I am attempting to run statistics in the following scenario: I have a list of hospital visits by approx. 60 patients to the emergency room. Each patient gets an EKG done of their heart, and I have ...
0
votes
0answers
17 views

Contrasts / Post Hoc Tests for three way repeated measures ANOVA

I have three factors A B and C with 2, 2 and 3 levels. A and C have significant main effects, B is not significant, interaction A*C is significant, the others are not. Now I want to know how to ...
0
votes
0answers
18 views

Specifying 'subjects' and 'repeated' options in Linear Mixed Model (SPSS)

This question is probably quite easy to answer for those who work with Linear Mixed Model analysis. My question is the following: I have a repeated measures design, where each participant completes a ...
0
votes
0answers
16 views

Can I report Univariate results without multivariate results in MANOVA?

I have nonsignificant results for my multivariate analysis (2-way MANOVA with 1 RM). Keep in mind there are 10 DVs that are correlated. The univariate results show significant results for 1 of the ...
0
votes
0answers
7 views

Anova with 2 within subject factors

I did an experiment where I had 58 participants complete a computerised attention task. I measured their reaction times as a consequences of two stimuli, one of which took 3 different shapes, whilst ...
2
votes
2answers
19 views

Correlation between repeated (not time) measures and not repeated measures

I have to perform correlation test between repeated and not repeated measures, more accurately e.g.: I sampled 20 individuals in 10 populations and I measured some traits (e.g. height) on the ...
0
votes
0answers
11 views

Can I average successive independent data points in a repeated measures analysis

I had 13 subjects who performed the same routines in random order. Each routine though was done several times to make sure the recording equipment would pick it up - consequently, due to equipment ...
1
vote
1answer
55 views

Is a two-way repeated measures ANOVA appropriate for my study?

I have 20 students, but consider them as 10 pairs. They will be doing six different activities, where the aim is to find which of the activities produce the most spoken output in the pairs. ...
0
votes
0answers
17 views

Repeated measures mixed model with nested data

I have been trying to figure out how to run the stats I need for this study for weeks and despite reading endless amounts of information am not much the wiser! If anyone can help, I would be hugely ...
4
votes
3answers
535 views

Making up for a low sample size by increasing the number of observations

What exactly is the error that is made in the following judgement? "I cannot increase my sample size, so I'll make up for the low number of subjects by asking the subjects to perform more trials, ...
1
vote
0answers
24 views

a crossover repeated measure feed trial using R

I attempt to analyse a crossover feed trial using R but I`m not good at statistical analysis. My data contains 10 subjects, equally divided into 2 groups named A and B. Each group were fed with diet A ...
0
votes
0answers
11 views

Repeated Measurement question

I am a master students for sport science. We did a passive peak torque (PPT) test in 8 subjects. Each subject had 4 intervention (stay quiet, doing maximal voluntary contraction, hopping and ...
0
votes
0answers
31 views

Repeated Measures ANOVA SPSS

I have the following predictors: - 2 within subject factors - 4 between subject facors Theoretically, I'm mostly interested in the main and interaction effect between the 2 within subject factors as ...
0
votes
0answers
17 views

Correct test to test effects of time and treatment

I have a dataset consisting of 3 treatment levels (A, B and C) and a response variable (plant height). Each treatment has 10 plants. Each plant is measured twice, once at the beginning and end. I ...