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.

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Binary outcome, prevalence at multiple time points

I have self-report data for diagnosis of a disease at four different time points for one population. What test should I use to compare the prevalence of disease at these four different time points in ...
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27 views

Using repeated measures change/trend as a predictor variable

I have repeated measures of happiness for a sample of participants, and a single measure of satisfaction for each of the ...
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28 views

Repeated measures on a small sample (n=3) with non-normally distributed continuous dependent variable

I would like to analyse repeatedly measured outcome (20 measures) data from an experimental trial I am running on three mice (n=3). My dependent variable is continuous but not normally distributed ...
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3 views

Intraclass correlation, multiple items per person

I am evaluating inter-rater reliability for acoustic measurements (formant frequencies) for vowel sounds. Data description: Subjects are recorded speaking 28 words, 7 words (5 different words, 2 ...
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17 views

ICC for inter-rater and parallel forms reliability with binary data?

I have 3 raters which each rate every file in a randomized set of files three times. Each file is rated as either a 1 or 0. I was hoping to assess the inter- and intra- rater reliability for the ...
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9 views

mean\medians as data points in two way repeated measures ANOVA

I have a table with 12 columns each regarding one combination of three (2X2X3) diffrent conditions in an experiment. Each row (25) represent a subject that did the experiment. Each data point in the ...
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8 views

Analyzing repeated cross-sectional surveys

I'm planning analyses for a substance abuse prevention media campaign and the funder is interested in looking at change over time in perceptions and attitudes towards drug use. We will take a sample ...
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9 views

Anova on repeated measures

I'm stuck with an Anova analyisis on repeated measures. I have the following dataset in long format After a meal, each subject in the study filled a nutritional questionaire on that meal. In ...
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18 views

Single subject independency of repeated measures

In part of an experimental trial (n=1), I asked the participant to answer a specific questionnaire (continuous response variable) under the influence of 4 different dosages (dosage 1, 2, 3 and 4) of a ...
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36 views

Three-level partially nested model

I am modeling change over time in group psychotherapy subjects using R and lme4. My data have the following structure: subject (id) time (code 1-10 for equally spaced repeated measures) outcome (for ...
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8 views

RM ANOVA in SPSS - 'Within' or 'Measure'?

I've gathered data on an experiment where my participants performed a task with 3 blocks. In each block, there were 20 trials, each offering them a choice between one of four options. So for example, ...
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20 views

How can I test the interaction of a 3-level, within-subjects variable with a continuous variable in R?

I would be extremely grateful for some advice on how to correctly fit linear mixed effects models with my repeated measures design! In my experiment, subjects completed a task with 3 difficulty ...
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16 views

Comparing groups with linear-mixed models

I have a problem with a dataset resulting from the repeated measurements of a clinical index on different patients. Each patient has been classified into two groups according to the index decline two ...
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8 views

Is it possible to get an interaction in Split Plot ANOVA (p = .02) and at the same time get a profile plot for estimated marg. M with no interaction?

In Split Plot/Mixed Design between-within (2by2 ANOVA with 3 DV) I got a significant interaction for one of my DV at F(1,196) = 5.467, p = .02. But when checked a profile plot for estimated marginal ...
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16 views

ANOVA single subject experiment

We have modelised an animal model to examine the distribution of a specific drug administered in two forms (either iv or per os) and a with a specific dosage (0.2, 0.4, 0.6, 0.8 ug for each ...
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1answer
18 views

What, if anything, is the relationship between random intercepts models and compound symmetry?

In the analysis of correlated data, you're often working with replicates where a worker does a task 2 or 20 times, or an individual is measured for blood pressure randomly over several times during ...
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8 views

Repeated measures ANOVA in a time series

I have a study design where 30 patients exercise breathing room air and then subsequently breathing reduced oxygen. Each subject has their cardiac output measured at 3 levels of exercise (low, medium ...
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12 views

How do I covary out a time-variable covariate in a repeated measures analysis?

I'm trying to analyze a longitudinal data set looking at pre- vs post-treatment effects on a single dependent variable. The difficulty I'm running into is that subjects in the group being analyzed are ...
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30 views

How to analyze dyadic repeated measures with categorical moderation?

I want to test the effects of the emotions expressed in private online chats between males and females (dyadic chats) on the female's satisfaction from the chat. And to test how some factors may ...
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18 views

How to correctly analyzed a mixed within-subjects/between-subjects design?

I recently ran a perceptual study in which I aimed to measure how emotion recognition accuracy from whole-body motions changed when two type of body representations were used. Five actors Ai with ...
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34 views

What are methods for computing the descriptive statistics of interval measures?

I do several measurements and obtain for each: $m_i = x_i \pm \delta x_i$. What are the mean and the standard deviation of a such series of measurements?
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10 views

Paired samples t-test (within-subjects) shows significant effect, BUT no main effect shows in Mised ANOVA - help!

Running some data looking at pseudoneglect: participants viewed figures that either had no change or small change in either left or right visual fields. t-test gave a signficant result, with ...
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1answer
33 views

Can I run generalized linear mixed models using lme4 on very small sample sizes?

I am analyzing data (size/survival) of two groups of fish (Group1, Group2) mixed together in tanks with two different environmental variables applied at two levels to the tanks, e.g. ...
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1answer
29 views

Select and aggregate time series based on selection information of a second dataset

General problem: I have two datasets in r and I do not know how I can calculate information across groups of time series in one dataset based on selection-information of another dataset. The details: ...
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23 views

Questions about mixed model design with repeated measures/nesting/incomplete design

I have data from a incomplete factorial experiment with repeated measures and potential nesting and am trying to figure out 1) the right way to design the mixed model to analyze the data, and 2) how ...
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9 views

Which analysis do I use for this experimental design?

Seeking feedback from those with a better quantitative mind than my own! Currently preparing my doctoral research proposal. I want to determine the impact that various levels of technology ...
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1answer
24 views

How to calculate pre and post treatment Hedge's g effect size to use in meta-analysis of studies with no control group?

How to calculate pre and post treatment Hedge's g effect size to use in a meta-analysis for studies with no control group? Can you do it with just pre and post treatment means and standard deviations ...
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18 views

Comparing percentages of a measurement in different conditions

I am performing behavioral analysis on two groups of mice, specifically looking at their gait. The machine that we use to analyze gait provides a percentage metric regarding a kind of step pattern ...
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3 views

Meaningful change after summary statistics for 3 variables (1 calculated ) at 5 time points (no raw data )

We have three continuous variables - one is a derived (weighted) average from the other two (total calls received , length of call) over 5 time points (monthly). If we were to implement an ...
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49 views

Convert SAS syntax for mixed models for repeated measures in R

I want to attain a p-value in R using lme4 or nlme which has been obtained from mixed models (...
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10 views

Group treatment with unbalanced repeated measurments

In this study I want to determine if treatment group b and/or c are different from control group a. There are 13 individuals in the study. The groups are unbalanced as there is a different number of ...
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16 views

Repeated measures MANOVA with NO between subjects variable

I'm struggeling with the choice of the proper statistical method for my dissertation in clinical psychology. About my research: - 2 Dependent variables (two different questionnaires; 'dysfunctional ...
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12 views

How to analysis this longitudinal trial with mixed effect model using R

The trial I need to analyse looks like this, with 5 subjects in each sequence: I supposed the model could be something like this: Yijklm = µ + Si + Pj + Hk(Si) + Tl + Dm + Tl × Dm + eijklm Yijklm ...
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8 views

MANOVA or ANOVA

I have 3 DVs that are correlated, and 2 IVs. I measured the DVs on 2 occasions. There is no control group, just a single group. Should I use repeated measures ANOVA or repeated measures MANOVA to ...
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27 views

Check coding for repeated measures mixed model in lme4 and nlme in R

I have made some models in nlme and lme4 and want to check I have coded them right, because I need to account for repeated measures from each territory (one measurement in each season). I'm looking ...
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1answer
33 views

Two-way repeated measures ANOVA for 2 independant and 1 dependant with heart rate

I've been trying to find someone with a similar question for hours now, so sorry if this is a duplicate: I've got music (independent variable no. 1)-three different types (so 3 levels), emotion ...
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19 views

SPSS vs R: test of flatness in profile analysis

I'm trying to do a profile analysis on a relatively simple design, but I'm getting different numbers between R and SPSS for specifically the test of flatness My data looks like this: ...
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23 views

Modelling where both the DV and IV change over time

In the typical repeated measures problem, the DV changes over time but the IVs stay the same. In my problem, I have an IV that changes. I cannot be completely explicit because the problem is ...
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1answer
16 views

Intrarater reliability test for a single subject?

I have repeatedly measured the volume of the brain of 1 subject in an MRI study. Measurements were acquired by the same rater (myself) on three separate occasions resulting in three measurements of ...
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2answers
23 views

Comparing mean test scores (different tests, same group)

I have the following problem: There is 1 group of students (student 1, student 2, ..., student n) This group of students takes several tests (math, French, Biology) - all scored as percentages ...
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16 views

What is the right statistical test for this scenario?

I have subjects that each provide arbitrary number of ratings (on a scale 0-5) to songs of 20 different genres. Each of the subjects can be of one of the five personality types (A, B, C, D, E) with ...
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22 views

Which test should I be using?

I'm doing a longitudinal study and want to compare two sets of scores taken three months apart to see if there's a difference. I also want to see if there's a difference between the two age groups ...
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1answer
44 views

Logistic Regression on Time-dependent Predictors

I would like to know if I can apply the techniques, like say Logistic Regression, to data whose variables/predictors are 'indexed' by time. Or if not, what techniques are appropriate to use in these ...
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1answer
53 views

Which multiple comparison method to use for a lmer model: lsmeans or glht?

I'm analyzing a data set using a mixed effects model with one fixed effect (condition) and two random effects (participant due to the within subject design and pair). The model was generated with the ...
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2answers
69 views

How can I compute a log odds ratio for a within-subject design that could be meta-analyzed with log odds ratios from between-subject designs?

Background and Problem I have a question concerning a meta-analysis combining effects from between- and within-subject designs using log-odds ratios (OR) as the metric of interest. I am familiar with ...
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19 views

How to compare before and after means between 2 different groups

I am doing a study with 34 participants and I calculated their fruits and vegetables consumption based on survey before and after the intervention. I also taken another measurement of stages of change ...
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15 views

Proc Mixed for repeated measures design, 3 within-subject factors (sas)

we have an experiment with 3 within-subject factors: SOA(4 levels), Congruency (2 levels) and Visibility Rating (4 levels). RT is our dependent variable. Because we receive Visibility Rating score ...
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1answer
33 views

Repeated Measures ANOVA in python

I have been looking to do Repeated Measures ANOVA in python. But it has been really difficult to find a python library that has this functionality. I also want to state that there are 2 ways for ...
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10 views

Why does the effect size for repeated measures ANOVA that do not assumed sphericity, is calculated using sum of squares of when sphericity is assumed?

The effect size index that I am referring to is omega squared. Omega squared is calculated using sum of squares values. When sphericity is violated in repeated measures ANOVA, you may used ...
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17 views

Difference between paired t-test and repeated measures ANOVA with two level of repeated measures

Would paired t-test and repeated measures ANOVA with two level of repeated measures on the same data give the same results? I ran a few tests and realized that their p values are the same. Does mean ...