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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How to carry out repeated time-to-event analysis in SPSS?

Please note that I also posted this same question in an SPSS specific forum, however if anyone here can also help, I would appreciate it. I have a question regarding repeating time-to-events ...
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13k views

Testing normality assumptions for linear mixed models and mixed (repeated) GLM ANOVA in SPSS

I have a mixed design that includes both repeated (condition) and between (sex and genotype) subjects factors. I would like to assess whether my data meets the normality assumptions for 1) General ...
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How to estimate the covariance matrix for repeated measures data given summary statistics?

I've been working on a power analysis for an RCT study for a psychological intervention. And I've been wondering how one would estimate the covariance matrix (or rho) for repeated measures data? This ...
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Balanced repeated measures design

Okay this is my problem: I have 12 participants. Each participant spent 3 nights in my lab doing a reaction time task at four timepoints during the night(12, 1, 2 and 3 oclock), with one week ...
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4k views

Non-normal and heterogeneous data with repeated measures ANOVA

I have run a repeated measures ANOVA using 3 groups and one factor with two levels. I have discovered that the data are not normally distributed (but not badly), nor is the variance homogeneous in ...
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How can I compare the effect of an pre-post intervention between two groups with multiple numeric dependent variables?

I have collected data from two groups (age 25-30, age 30+). In each group I have 10 patients. I performed several medical tests (i.e., R.B.C, Liver test, etc.) on the patients, before and after ...
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906 views

One-way repeated measures ANOVA and missing data

I have following data for the one-way repeated measures ANOVA test and I don't know how to deal with missing values. The data looks something like this: ...
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1answer
614 views

Repeated measures ANOVA

I have to apologise about my lack of experience but hopefully someone can clarify things for me. I am interested in looking at change in psychosocial functioning over time and compare it between ...
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797 views

Controlling for a variable in a GEE using SPSS

I have a dataset which I think would suit GEE. I am trying to assess the relative contribution of a number of simultaneous predictors and their interactions to the intensity of hurt feelings. I asked ...
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How to test for differences in binary score data?

I have data from a human subject study that was setup as a 3x2 (system by task type) experiment, with 24 participants. Each participant completed 6 tasks in all, one using each of the 3 systems, and 2 ...
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57 views

How to compare first to second half of measurements in a counterbalanced behavioral experiment?

I want to compare measurements in two halves of a behavioral experiment to examine for learning effects. My first course of action is to split the measurements in the two halves and then repeat the ...
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333 views

Non-parametric repeated measures ANOVA [duplicate]

Is there any method to conduct a non-parametric repeated measures ANOVA in a replicated design? I'm using a non-parametric approach because the response variable does not pass the parametric ...
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Analyse within-subject data as between-subject data

Presence (or better sense of presence, i.e. the extent to which one feels that a mediated experience is not actually mediated) is a notoriously difficult variable to pin down and the question of how ...
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ezANOVA package in R: right method for my experimental design?

I have a problem with the ezANOVA package using for rm ANOVA or a problem with my statistic design of the experiment (or both ;-)) My file looks like this, <...
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Repeated measures within and between conditions

I tested reactions to pictures under five conditions (neutral, high status, low status, high adhesion, low adhesion), using an EEG of 16 channels. The pictures were presented in random order for 15 ...
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1answer
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Comparing means between two groups over three time points

I have two groups of ten observations each, where the weight are measured at three different points in time. Let´s say baseline, 2 months and 5 months after baseline. Now I would like to draw a ...
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How can I compute a repeated measurement ANOVA with a mixed model?

It is my task to program a mixed model. The data is from 20 experimental subjects, who were measured under 2 factors. Factor A has 7 levels, factor B has 3 levels. So, that for every subject I got 21 ...
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186 views

What would be a good paper to cite to explain simulation methods in proc mixed in SAS?

In order to analyze data obtained from a repeated measure study, I used the following SAS code: ...
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Can I used a repeated measures ANOVA or do I have to use a multivariate ANOVA?

I don't feel very comfortable with stats (still using simple programmes like SPSS rather than R!), and have a question about which is the best test to use with the following design: I have performed ...
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Which t-test to use for a two-group pre- post-test design?

I have data on 26 participants (13 from computing and remaining 13 from non computing) who have participated in my research. Each participant is treated with a lab module (Hands on Robotics Session). ...
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1answer
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What test is appropriate for binary outcome with repeated measures and binary, ordinal and continuous independent variables?

I'm trying to figure out what is the most appropriate statistic test for use with my data and was hoping for some advice. The primary data consists of a binary independent variable (patient test - ...
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495 views

Not sure how to carry out this two-way repeated measures ANOVA

I have a scenario where both factors are within-subject. One is time (5 levels) and one is condition (2 levels). The time point of 0 was only measured once in each subject, and is a 'resting value' ...
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1answer
174 views

Dichotomous DV and 3 points of measurement per condition within each subject

I have been reading a lot on this site and I think I am going to analyze my data using a mixed model ANOVA- random effect= subject and 2 fixed effects- comparison and pricing. All of my subjects were ...
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What analysis (in SPSS) should I use for a repeated measures design with dichotomous outcome variable? [closed]

Parts of my question may seem rudimentary but the more I read, the more confused I get so I am going to completely spell out my experiment. In my study, I have created 4 conditions by crossing 2 ...
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Standard error of the mean vs. standard error of mean difference

When plotting within-subject data for condition A vs. condition B (significance tested through a t-test), should the error bars reflect standard error of the mean for each condition independently? Or ...
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246 views

How to test and examine interaction effect in 2 by 3 by 6 mixed ANOVA design?

Background: I have two groups of children - one group with normal hearing and one with permanent hearing losses - call them NH and PHL. Each child has had a hearing test, consisting of 6 different ...
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What is covariance in plain language?

What is covariance in plain language and how is it linked to the terms dependence, correlation and variance-covariance structure with respect to repeated-measures designs?
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How do I deal with a violation of sample independence in a Pearson's correlation?

There was a concern raised by reviewers of a manuscript of mine over the proper execution of a Pearson's correlation. In brief, this was undertaken in order to determine the relationship between the ...
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1answer
541 views

How important is it to define the nested design in a within subject ANOVA?

I am asking to find out why a factor may become non significant after I define the nested design. The following are the two aov analysis in R. Obs (subject #) is the within subject factor and stim3 &...
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1answer
4k views

How to analyse multiple between subjects factors in a mixed ANOVA in SPSS?

I am performing a Mixed between subjects Anova where I have multiple time points that subjects have completed a measure at. The within subjects factor is time. The between subjects factors include ...
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1answer
1k views

Covariance matrix in multilevel repeated measures model

I'm trying to fit a multilevel model for a repeated measures design with three levels: Subjects - conditions - trials. Each subject passes the test in two conditions, and there are 21 trials in each ...
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1answer
451 views

How do I predict subject mean (w/ error) with repeated measurements in SPSS?

Context: say I am trying to determine the concentration of a chemical, so I take known concentrations of the chemical and make a standard curve (6 measurements per standard) then measure my unknown 6 ...
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1answer
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Whether to assess normality in a factorial repeated measures ANOVA by looking at distributions within cells?

I'm a little confused about the analysis of normality in a repeated measures ANOVA I'm doing. It's a factorial ANOVA with three rm IVs each of which has only 2 levels. I've read in a few places online ...
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10k views

What is a valid post-hoc analysis for a three-way repeated measures ANOVA?

I've performed a three-way repeated measures ANOVA; what post-hoc analyses are valid? This is a fully balanced design (2x2x2) with one of the factors having a within-subjects repeated measure. I'm ...
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Repeated measures ANOVA or Friedman test?

I have a study with 35 subjects who received hypercoagulability testing at 4 different times (before surgery, after, at 1 week, and at 1 month). Each subject has 9 different test of hyper ...
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351 views

The minimum number of time points required on repeated measurement

@JeromyAnglim, thanks for your answer to "How to determine the sample size needed for repeated measurement ANOVA". My question: Is there a formula to estimate the minimum number of time points ...
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1answer
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Collapsing data for repeated measures ANOVA?

Data An experiment was run with 40 subjects. 20 subjects are in condition 1 and 20 in condition 2. Over the course of the experiment, subjects went through 60 trials. 20 trials with stimuli of type A,...
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1answer
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How to do a repeated measures ANOVA with missing combinations in spss

I currently have a setup, for which I want do do an ANOVA in spss. In my model I need to include four factors (I'll call them factor1 to ...
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9k views

Where are the t-values in my pairwise comparisons?

I have data from a study with three conditions. The independent variable was within-subjects and within-items. I did an F1 and F2 analysis (= twice a repeated measures ANOVA) on the averages, by ...
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1answer
327 views

What model for a challenging data set? (hundreds of time series with a lot of nesting)

I have quite a complicated data set to analyze, and I cant find a good solution for it. Here is the thing: 1. the raw data is essentially insect song recordings. Each song is made of several ...
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1answer
5k views

How do I fit a nonlinear mixed effects model for repeated measures data using nlmer()?

I am trying to analyze repeated measures data and am struggling to make it work in R. My data is essentially the following, I have two treatment groups. Every ...
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2answers
473 views

repeated measures regression

I was hoping that I could get some feedback in terms of keywords I should searching for, or concepts I need to consider with the following: I have non-experimental data that I would like to model in ...
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2answers
9k views

Bonferroni and Greenhouse-Geisser corrections with repeated-measures ANOVA

I guess my question comes in two parts: Following a 1x7 repeated-measures ANOVA, I carried out 3 pre-planned tests. Two were t-tests between 2 of the conditions. The third is a 1x6 ANOVA (to test ...
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2answers
113 views

How to analyse reading data with two word types and three types of dependent variables?

In my study, I have one group encoding 2 different types of words (within subjects) and 3 different dependent measures namely recall, recognition, rating. I think that I can conduct repeated measure ...
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Example reports for mixed-model analysis using lmer in biology, psychology and medicine?

As the general consensus seems to be to use mixed-models via lmer() in R instead of classical ANOVA (for the often cited reasons, like unbalanced designs, crossed ...
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4k views

How to simulate repeated measures multivariate outcomes in R?

@whuber has demonstrated how to simulate multivariate outcomes ($y_1$, $y_2$, and $y_3$) for one time point. As we know, longitudinal data often occur in medical studies. My question is how to ...
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3answers
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How to compare response to same question asked at different time points?

I asked survey respondents about two points in time, and asked participants the degree to which they "agree", a typical Likert-style question. For example, as if I had asked "Before Obama became ...
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2answers
24k views

How to analyse pre and post test data when the outcome measure is Yes/No data?

I am doing research on 20 participants and the participants will work on a lab module. There will be a pretest before the lab module and post test after the lab module on concepts related to ...
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1answer
152 views

How to control for depression when sample was measured using two different tests?

I am looking at pre and post test depression scores in a 2x3 design with treatment and genotype as the IVs and depression score as the DV. However, I have to use one depression test for younger ...
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1answer
7k views

Repeated-measures ANCOVA in R?

experts, I would like to ask for advice regarding the analysis of a dataset I am currently working on. In the experiment subjects were tested in a reaction time task (RT as dependent variable). In ...

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