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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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Analyzing behavioral change: Comparing 2 measured weight curves to a model curve

I'm currently in the process of analyzing experimental data and would like to hear your opinion on the method I would like to use to test my hypothesis. I had an experimental setup where I recorded ...
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1answer
11 views

Two-way repeated measures anova using a “categoryish” independent variable?

I am trying to run a two-way repeated measures anova in spss but i think my data needs restructuring. I have run anova's in spss before so i am familiar with process. The problem is that when i have ...
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Determine sample size for three-way ANOVA with repeated measures

My experimental Design looks something like this: two groups do a Simon task. There's four dependent measures for every subject: Reaction times to congruent vs. incongruent trials in n after a ...
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1answer
82 views

r - 2-way Repeated Measures ANOVA - different degree of freedom among ezAnova, aov and lme

I would like to run a simple repeated measures ANOVA with 2 factors (Food & Drink). Let's have a dummy df: ...
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1answer
29 views
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Bacteria picked up on fingers after multiple surface contacts: non-normal data, repeated measures, crossed participants

I have two groups of participants (A=wearing gloves, B=no gloves) who are repeatedly touching contaminated surfaces with E. coli. I want to know if there's a difference between the amount of bacteria ...
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glmer repeated measures

My design is: y is a proportion: var name CS Xw1 is a 2-level condition variable, within subjects (all subjects participate in both conditions): var name Language Subjects also participate across ...
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2answers
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Can Cramér's V be used an effect size measure for McNemar's test?

I'm using McNemar's exact test (with R's "mcnemar.exact" function). I know that giving the odds ratio or proportion would be an adequate measure of effect size (Effect size of McNemar's Test), but ...
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23 views

Controlling for repeated observations and clusters in logistic regression

I ran an experiment with factor X (2 levels) varied within-subjects, and factor Y (3 levels) varied between-subjects. The outcome is dichotomous. There is a control variable (Z, continuous) which I ...
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14 views

Compare factor levels from a factor which is both within and between subjects

I have a data frame from an experiment in which subjects rated the beauty of landscapes on a continious scale from 1 to 10. My data frame looks something like this: ...
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56 views

In MIXED models for RM, is it necessary to include interaction effects between covariates and time?

I am currently analysing data of a cohort study where we try to model change in a dependent variable (say, academic grades) over three time-points based on a number of continuous independent variables....
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1answer
39 views

Why do I get a massive drop in AIC/BIC when adding a main effect that isn't even significant?

I have no explanation for this. Note how "school" isn't significant, yet the model with only that main effect has a much lower AIC (and BIC) than the one with time, intervention, and intervention*time ...
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Sample size assessment for two-way ANOVA with repeated measures with GPOWER (or other software?)

I’m trying to assess the sample size for the interaction of two within subjects factors, in a two-way ANOVA with repeated measures design. Design: In a single sample, participants; On the first week ...
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Use a two-way repeated measures ANOVA when we have two independent groups

Our study consists of two independent groups named as EXPT and CTRL. There are 10 subjects in each group, and measurements at two points: pre and post test. Can we use a two-way repeated measures ...
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Correlation analysis between two variables that each has pretest and posttest measures

Is it possible to conduct Correlation analysis between two variables that each has pretest and posttest measures? If yes, how? And if no, what kind of analysis should I be conducting? Edit: I would ...
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1answer
22 views

Repeated measures ANOVA instead of t-pair and t-independent

when have two groups: control nd experiment and two measurement at pre and post test, in this condition can i use repeated measures ANOVA istead of t-pair and independent
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1answer
24 views

Two between factors in repeated measures ANOVA

"Can i put two binary variables in the between factors part of the repeated measures ANOVA?" Participants: Patients, Healthy Controls Task: All participants do a task (Pre intervention Score). Then ...
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0answers
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Should this be a one-way repeated measures anova?

I'm a new phd researcher and i just completed my first set of experiments. Participants played the same game using three different control mechanisms. In the game they had to complete a series of ...
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29 views

Analyzing Pre/Post Binary Outcomes - What type of model is appropriate?

I apologize for the rudimentary questions. This was not my study, and I am only tasked with analyzing the data. Background I am analyzing data on awareness of tobacco health risks before and after an ...
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29 views

Random repeated-measures linear mixed-effect model

I want to analyze how the number of ants of the species "A" is related to different environmental measurements (Temperature, relative humidity, and wind speed), number of flowers, number of ...
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Effect size intepretation

-Within-subjects design -30 subjects, counter-balanced. -Free recall study (are concrete words better for memory than abstract words) -Two minute distraction task after memorization and before recall -...
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22 views

Fisher's exact / Chi-squared tests with repeated/dependent observations

I have a dataset (structure explained below) for which I want to perform some tests on 2x2-tables. The data is generated from a (randomized) experiment, and structured as follows: I have n subjects, ...
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21 views

How to deal with measurement points that are not equally distributed over time when analysing data with linear mixed models?

A variable is measured repeatedly within a study (e. g. blood sugar levels every day over the course of two weeks while patients are giving a specific treatment). There are also two follow-up ...
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How do I perform within subject repeated measures analysis without groups?

In an experiment I have tested participants accuracy in 2 conditions (A and B), each with the same 2 levels (1 and 2). Additionally, these participants have been scored on a test (P-Test Score) with ...
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1answer
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Assumptions of the Friedman Rank Test

Let $X_i:= (X_{i,1}, ..., X_{i,k}) $ for $i =1...n$ be $\mathbb{R}^k$-valued random Variables with $k\geq2$. I wonder what the exact assumptions are to apply the Friedman test to Realisations of ...
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How to calculate required sample size for nested 2x8 repeated measures design?

I need to calculate the sample size required for a 2x8 repeated measures design in which variable B ("condition", 8 levels) is nested in variable A ("stim", 2 levels). In our previous analysis, we ...
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Which type of ANOVA fits?

Currently researching the effects of altitude acclimation. Each person was exposed to exactly the same conditions on four consecutive days for one hour each time. A number of baseline measures were ...
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14 views

Group comparision in repeated measures data with missing values?

I have data from blood samples collected from 20 patients before, during (at 30 min, 1 h, 2 h, 3 h, 4 h) and after a medical treatment (using the slightly different treatment protocols A and B). The ...
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190 views

Compute partial $\eta^2$ for all fixed effects anovas from a lme4 model

Disclamer: I wasn't sure where to post this question: CV or SO, but eventually decided to try here first I've been asked by one of the reviewers to add effects sizes (preferably $\eta^2_p$ which is ...
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9 views

Multilevel repeated measures design

How does one model a series of FIXED stimuli within a repeated measure design? Our design measures a subjectively measured continuous outcome (the dv) at 4 different points in response to a sequence ...
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5 views

How can I generate mean QALYs by time step from qol in stata

I have some data from a step wedge study for I have calculated the qol in stata for each step and patient. QOL is measured at the end of each step 6 monthly. The steps 0-6 and group (0 control, 1 ...
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Must individuals have more than one observation for repeated measures analyses?

In cohort studies of change over time (for instance change in repeatedly measured weight after a dietary intervention, using linear mixed models or GEE), what is the detriment of including individuals ...
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19 views

Can linear mixed modeling account for regression to the mean in pre-post study?

I have a pre-post study measuring change in quality of life scores with a treatment cohort and control cohort. However, the treatment cohort is at "high risk" so regression to the mean is a real ...
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14 views

pooled cross-section and repeated cross-section

guys I am very confusing about whether pooled cross-section and repeated cross-section are the same thing? If they are not, what is the difference between them? Could anyone answer me, please?
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Cohen's kappa for repeated measures longitudinal data

I have a dataset with more than 100 repeated measures of observations across multiple subjects. I want to estimate the agreement between two of the variables measured repeatedly. Note that each ...
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1answer
85 views

Puzzling predicted values in generalized multilevel model

I ran a multilevel model with a dichotomous variable as the outcome using the logistic link function. I did this with the lme4 package in R. An approximation of my ...
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Cronbach's alpha in case of repeated measures (discordant opinions) [duplicate]

I want to calculate Cronbach's alpha to know the reliabily of a scale made of 5 items. The 50 subjects answered to the questionnaire 6 times, for 6 different stimuli. One colleagues says that it's ...
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Homoscedasticity test for repeated measures ANOVA, SPSS

My experiment has three treatments, looking at different measures of animal behaviour in response to each treatment. Firstly, is testing for homoscedasticity for a ...
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14 views

Would you consider this for paired analysis?

I've been having some heated discussions about whether this scenario using a cell line (passaged over and over) constitutes a paired analysis or not. By this point, I thought it was wise to ask the ...
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1answer
101 views

Custom contrasts with lmer in R for a 3x2 with 2 random factors

I would like to test with lmer the effect of condition (cond: A, B, C) x time (time: T1, T2) ...
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15 views

Statistical test to compare rates of change in 2 variables

I have some data on patients with a neurological disease at 2 different time points. At both time points patients have a clinical rating scale score (a measure of disease severity) and the levels of ...
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1answer
37 views

When to use repeated measures versus ANOVA on differences

I conducted an experiment where students were divided between two experiment groups and two language levels. They all completed a pre-test and post-test. I have tried the following two approaches, ...
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1answer
39 views

Repeated measures, ZI negative binomial GLM in R?

So...I'm not entirely sure if this is possible but thought I'd post here to ask. Additionally, I've never used R before (except for screwing around for an hour or two in Swirl) so please bear with me. ...
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19 views

What is the minimum number of post-baseline time points for a mixed model?

I have 200 case and 200 control patients. There's a baseline time point (n=400) before the intervention began, 4 months later is the first follow=up, one year later is the 2nd follow up, for 1200 data ...
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Calculating Standard Deviation and Mean of N experiments of the same phenomena

I am a beginner in statistics. I want to calculate the mean and standard deviation of an entire time series data. Let's say I am measuring some phenomena y vs time t. I repeat the experiment say 3 ...
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1answer
39 views

Type of statistical test for categorical variables?

What test am I supposed to use in this case: Categorical outcome [correct, partially incorrect, incorrect] Categorical predictors: Condition [2, 5 and 10 presentations of an image]. Time in which ...
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17 views

Experimental design comparing two different drugs

I'm planning a study evaluating the effect (behavior, memory task) of two different drugs at multiple doses (+vehicle control). Ideally I'd like to compare the effects against the control and each ...
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0answers
19 views

Statistical analysis for repeated measures?

In my study I made three parts, and for each of these three parts I performed 20 force measurements and deflection tests (the schematic of the experiment is presented in Figure 1 below). I would like ...
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If subjects are repeatedly measured, all at once, how should you specify your mixed model?

I have a treatment group and a non-treatment group, indicated by binary variable 'intervention'. Patients are all measured at time point 0, and afterward the treatment begins for those in the ...
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Interpreting interaction between a within-subject factor and a between-subject-factor

I am not sure how to interpret the following interaction between the within-subject factor "prime" and the between-subject-factor "group" (DV are response times). The outcome is slightly not ...