# Tagged Questions

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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### Moderation analysis for repeated measures ANOVA [on hold]

My dataset looks like this: My hypothesis is that the statistical differences between the within-subjects measures (A1 vs A2 vs A3) are moderated by a third variable (mod) which is continuous. What ...
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### How to convert two different types of measurement (both in ms) to run a MANOVA?

I measured reaction time and movement time in an experiment (within-subjects measures) and want to run a MANOVA in SPSS with these measures as the two dependent variables. They are both in ...
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### In SPSS, what follow-up tests for a three-way repeated measures ANOVA with no 3-way interaction?

For a three-way repeated measures ANOVA: Do I use simple main effects syntax or run t-tests in SPSS in my follow up analyses (pairwise comparisons?) for a non-significant three-way interaction, with 1 ...
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### Fitting and interpreting random effects in repeated measures and unbalanced ecological data set

I have a vegetation data set that consists of 150 plots that were sampled 1-3 times over a three year period. Plots are my unit of observation and they are unbalanced (since plots were sampled either ...
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### Mixed factor both “within” and “between” subjects

I am wondering about experimental designs in which the levels of a factor are partly within and partly between subjects. Assume for concreteness that the experiment is as follows: The response ...
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### repeated measures not normally distributed

I have data with repeated measures (colony) it looks like this: PH Colony Depth RR_PROT 8.15 S1 6m 0.125378167 8.15 S2 6m 0.124575946 8.15 S3 6m 0.872706067 ...
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### How to weight a repeated measures factor in a three-factorial design?

I have a design with three factors. two of them are categorical between-subject factors: relationship closeness (close/distant) and experienced trauma (yes/no) The third factor is a repeated ...
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### JASP: How to calculate mixed repeated measures ANOVA

I am trying to calculate a 2 X 2 mixed repeated measures ANOVA using JASP. I have one between-subjectes factor with 2 levels and one within-subjects factor with 2 levels (4 of the measurements were ...
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### Equivalence of paired-samples t-test and repeated measures ANOVA with two conditions regarding effect size estimates

To compare two within-participants conditions, I ran two tests (with SPSS): A repeated measures ANOVA with one factor with two conditions and a paired-samples t-test. I thought that these two tests ...
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### Repeat measures with missing data

Need guidance: I have repeat measures (5 successive measurements) of symptoms (categorical) & labs (continuous). N=809 patients. Outcome var is 1. composite outcome (sum of complications) ...
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### model for non-linear data with repeated measurements

I have to do a model for non-linear data with repeated measurements. I worked with predatory insects. I did an experiment with 4 treatments, where per each treatment predators received a different ...
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### Mixed ANOVA: 2 within subjects factors, 1 between subject factor

I did an experiment where I had two groups A (22 subj) and B (19 subj) receiving different treatments, performing a task with 3 conditions, cond1, cond2, cond3, in 2 moments (pre and post treatment). ...
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### Full-Factorial Design (3^2): Not sure about right method for analysis

I ran an experiment (online-survey) showing venture capitalists 9 fictional startups that only differed in factor 1 and factor 2. Both factors had three levels: Factor 1 = 50,250,450; Factor 2 = 0.5,1,...
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### Test for ordinal repeat measure data with multi level response categories

I want to find the relationship between parameter setting of medical images and the visibility of the organs in images. I also want to see if the organ visibility in the test images are significantly ...
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### Do I need to use a repeated measures statistical test for my data?

I conducted an analysis over three different time periods, investigating if there is a difference across time periods to how strongly my subjects react to two different stimuli. What I'm interested in ...
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### Missing F statistic in repeated measures ANOVA

I am having difficulty understanding the SPSS output of GLM repeated measures ANOVA which is adjusted for by 3 covariates, as it appears that no F statistic could be calculated. This model was run as ...
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### Using lme (or lmer) building a mixed model with repeated measures, a covariate, and multiple blocking factors (treatment and patch within treatment)

Our study is looking at annual plant Biomass (ANPP) across several sites and years. Each site has four ...
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### Determining the correct test for experiment design

I'm trying to figure out the right test to use for my experimental design, I was hoping someone here could help. Here's the structure: Two independent variables, IV1 and IV2. IV1 has 3 levels, IV2 ...
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### Examine associated change in variables over time

I would like to test whether change in variable A over two points in time is associated with change in variable C over the same two points. I would also like to determine whether change in variable A ...
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### Comparing overall means of multiple measurements in replicated samples

I have a biological dataset comparing two mutants, A and B. For both A and B, I have a measure of expression for each unique gene. I have two replicates for each mutant, and thus four sets of ...
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### repeated measures regression / change score

I want to run a regression with positive affect as my DV (measured at two different time points (t1 and t2) and well-being (WB) as a continuous IV. I ran two different models: In the first model I ...
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### What is the difference between a Within Subject and a Repeated Measure design

I am having some trouble understanding the difference (if any) between a Within Subject and a Repeated Measure design. A few resources online seem to suggest that they are often interchangeable or ...
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### Is ANCOVA correct here?

I am analyzing data from a mindfulness intervention in which 60 participants took part in an ipod-based intervention listening to meditation tracks. Outcome measures on anxiety, depression, stress, ...
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### Two-way repeated measures ANOVA- simple main effect

I have 2 independent variables: one is target location (TL) and another is stimulus characteristics (SC), each of them have 3 levels. I collected reaction time data from a same group of participants ...
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### Levene's test for mixed repeated-measures in R

As ezAnova does not provide Levene's test for mixed repeated-measures analyses, I am wondering what the best solution to this problem is. In my case I have a between-subjects factor (2 levels) and a ...
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### Pairwise post-hoc comparisons in a two-way repeated-measures ANOVA in R

I need to analyse data from an experiment with two within-subjects factors, namely block (1, ...
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### Are the t-values I get in contrast analysis on lmer() model correct?

I ran a one-way repeated-measures anova in R using lmer. My categorical IV has three levels and I assigned Helmert contrasts that I want to test for significance and also calculate effect sizes. I ...
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### Effect of an auditor's experience on client size and client complexity

I am working on a dataset containing a list of auditors, collected in four different years: 2008: 650 auditors 2009: 646 auditors 2010: 635 auditors 2011: 620 auditors (A possibly large number of ...
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### Specifying Error() in R aov function

Consider a data where samples from different populations of 5 species are analyzed after 4 treatments at 3 time intervals. So the independent variables are ...
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### GEE returned Mean estimate 0.5, confidence limit 0.5-0.5 and SE of ZERO for a categorical variable

Following were the notes NOTE: PROC GENMOD is modeling the probability that CompositeO='Yes'. NOTE: Algorithm converged. NOTE: Algorithm converged. NOTE: The empirical covariance matrix ...
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### Modelling dependence between two groups but not within effects in ANOVA

I have two conditions and in each condition, the same participants took part. however, I am not interested in how the value of an observation changes between the two conditions for each participant (i....
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### How do I correctly use Between-Subjects Factor(s) for exploratory variables on a 6-level Within-Subject repeated-measures ANOVA?

When analyzing data using a repeated measures ANOVA with multiple exploratory variables, there are four methods I could use, each of which produces different results. Which of these is the correct ...
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### Repeated Measures MANOVA with contrasts?

The data that I am using consists of 74 people that answered three DV once (each of them once). I had a 2x2 design, with Context x Intensity as IVs. I have done a MANOVA on the data but my supervisor ...
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### Conduct mediation and moderation in within subject design

I was wondering if someone could help with how to conduct a moderation analysis and a mediation analysis in a within subject (repeated measures) design? I am familiar with the Judd, Kenny, McClelland, ...
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### Test for repeated measures with large numbers of missing values

I have a number of independent continuous variables, such as HbA1c, waist circumference, total cholesterol measured in approximately 300 people over various time points (baseline, 3, 6, 12, 24 months ...
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### What statistical test should be used to compare two independent sample over time (pre- and post-test) for categorical variables?

I have baseline and follow-up surveys, asking the same 33 questions. A typical question is: How well do you think your family knows what you are good at? Very Well Well ...
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### Analysis of reaction times with missing data by trial/item

I have a developmental psychology study with one between factor (age) and two within factors (scale-3 and difficulty-2). I recorded reaction times but have eneded up with a lot of missing data for the ...
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### May I analyze this kind of data with ANOVA?

I have the following kind of experimental setup. There are two different tasks (say A and B) the participants are performing. Each task is performed thrice (three times) by each participant. There is ...
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### Repeated measures but not longitudinal: A case of multivariate LMM or repeated measures LMM?

I am trying to get my head around the question of what kind of model is most appropriate for the following data: Every participant rated 14 written statements in terms of various aspects (e.g. ...
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### Repeated measures study with a covariate

We conducted a study where we are measuring perceived tiredness at different intervals (a total of 10). We recorded a score before starting the experiment, as a covariate to account for differences in ...
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### How to describe this model

I have a study where subjects have received treatment to one eye, the other eye is untreated and is acting as a control. There are 3 measures (of retinal thickness) taken in each eye. The model I am ...
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### Account for Repetition in Experimental Design when testing variants of an image

In my experiment, an image is presented in five different ways to the test person. The person then has to do some task like "point to the red flower in the image" and I measure the time taken to check ...
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### repeated-measures linear mixed-effect model

I have two soil treatments: CT and NT. For each treatment, I have 11 CO2 measurements taken in 7 times, i.e. 11 "replicates" for 7 dates. I'd like to evaluate if the measurements are different in ...
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### Applying Friedman Test on percentage of binary outcome

Is it correct to analyse data as described in the following? N Participants were asked to watch different videos showing the outline of a hand grasping an object. Four different types of hands were ...
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### Is repeated measures or mixed model ANOVA necessary for this analysis?

I've spent a long time generating and analyzing a dataset and now it comes down to the statistical analysis... and I'm not sure how best to proceed. In my dataset, I have rats sorted into one of 4 ...
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### Analysis of measures of difference

Let's say I want to measure the width of a road using a measuring tape. I've drawn a crap diagram here: Rather than measure the distance directly, I decide to be obtuse and measure the distances ...
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### How to analyze differences between two time series collected under two different conditions

How should one analyze time series data that were collected during two seasons: season 1 and then at season 2, where during each season a measurement sample for several continuous variables were ...
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### Reporting the results of a mixed within/between subjects permutation test

I am doing some hypothesis testing on the results of an electrophysiology experiment. I have electrical recordings of the rate of fire from two different populations of neurons (let's call them ...