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 solve a case of unbalanced repeated measures?

I have animals, that could be virgin or mated (reproductive state is the fixed factor), which I've stimulated sequentially with 4 different doses of an odour (doses are the repeated measures, the same ...
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1answer
2k views

How should I analyze repeated-measures individual differences experiments?

I do quasi-experimental individual differences psychology research. I examine how people who differ in a cognitive ability (that I measure) perform on another task that always at least involves within-...
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1answer
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Sample size for proportions in repeated measures

I'm trying to help a scientist design a study for the occurrence of salmonella microbes. He would like to compare an experimental antimicrobial formulation against a chlorine (bleach) at poultry ...
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2answers
466 views

Taking advantage of many pre-treatment measurements

I am planing a pre-post treatment-control design study with a large number of pre-treatment measurements. I have subjects divided into a control group and a treatment group. For both groups, I will ...
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3answers
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How do I setup up repeated measures data for analysis with nlme()?

I'm trying to transition to R from using SPSS. In the past, I've setup my data in the wide format for my repeated measures ...
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1answer
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Multiple comparisons on a mixed effects model

I am trying to analyse some data using a mixed effect model. The data I collected represent the weight of some young animals of different genotype over time. I am using the approach proposed here: ...
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1answer
16k views

Unbalanced mixed effect ANOVA for repeated measures

I have data from patients treated with 2 different kinds of treatments during surgery. I need to analyze its effect on heart rate. The heart rate measurement is taken every 15 minutes. Given that ...
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2answers
3k views

Compare treatments on mean difference between two times

This sounds like an easy setup, and I'm absolutely sure it's not too complicated to do, but somehow I can't figure out how to approach this. The setting is as follows : There are 6 treatments with 16 ...
10
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2answers
422 views

Longitudinal comparison of two distributions

I have the test results of a blood test administered to 2500 people four times at six-month intervals. The results primarily consist of two measures of immune response - one in the presence of ...
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5answers
9k views

Modelling longitudinal data where the effect of time varies in functional form between individuals

Context: Imagine you had a longitudinal study which measured a dependent variable (DV) once a week for 20 weeks on 200 participants. Although I'm interested in general, typical DVs that I'm thinking ...
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1answer
6k views

Determination of effect size for a repeated measures ANOVA power analysis

This is a follow-up to the repeated measures sample size question. I am planning a repeated measures experiment. We record energy usage for 12 months, then give (a randomly assigned) half of the ...
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3answers
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Might be an unbalanced within subjects repeated measures?

I ran a within subjects repeated measures experiment, where the independent variable had 3 levels. The dependent variable is a measure of correctness and is recorded as either correct / incorrect. ...
14
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1answer
35k views

How to determine the sample size needed for repeated measurement ANOVA?

I need some help about repeated measurement ANOVA. We are investigating the effect of some intervention on reducing blood stream infection (BSI) rate in some wards. We plan to capture the BSI rate ...
14
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2answers
3k views

What would a confidence interval around a predicted value from a mixed effects model mean?

I was looking at this page and noticed the methods for confidence intervals for lme and lmer in R. For those who don't know R, those are functions for generating mixed effects or multi-level models. ...
10
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1answer
990 views

Estimating variability over time

I have a dataset that contains ~7,500 blood tests from ~2,500 individuals. I'm trying to find out if variability in the blood tests increases or decreases with the time between two tests. For ...
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1answer
409 views

Parametric techniques for n-related samples

The title is quite self-explanatory - I'd like to know if there's any other parametric technique apart from repeated-measures ANOVA, that can be utilized in order to compare several (more than 2) ...
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3answers
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A non-parametric repeated-measures multi-way Anova in R?

The following question is one of those holy grails for me for some time now, I hope someone might be able to offer a good advice. I wish to perform a non-parametric repeated measures multiway anova ...
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5answers
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Post-hocs for within subjects tests?

What is the preferred method for for conducting post-hocs for within subjects tests? I've seen published work where Tukey's HSD is employed but a review of Keppel and Maxwell & Delaney suggests ...

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