repeated measures

  1. S

    Combine repeated measures into single variable (dataset is already in stacked format)

    Hello, I am working with a longitudinal datasset that is already in the stacked/multiple-record/vertical format (there are six entries for each case). As it stands, there are seven separate variables that measure medication use at the seven time points. I am having a really hard time...
  2. J

    Mixed model, repeated measures, manova, nested? nominal

    Hi. I am not sure how to approach the statistical analysis of the following study. Any insights would be greatly appreciated. Thanks! So, I have two independent groups, group A and group B. I am collecting data for 3 different tasks (Task 1, Task 2, Task 3) at 3 different time points, Pre...
  3. K

    Which analysis is appropriate for our study design with multiple DV's at 3 levels?

    Our bachelor research is about distance perception in the peripersonal space. The experiment was already complex to design with the oculus rift, but the statistical analysis appears impossible :shakehead. We are trying to fit the data we gathered till now into the right analysis but we are...
  4. K

    repeated measures, 3 conditions and multiple DV's in each of the conditions

    Our experiment design is kind of complex: 35 participants, stimuli were approaching cones that disappeared at different distances (conditions: near (20 cm), mid (60 cm) and far (120 cm). The cones were seen through the oculus rift. Participants estimated the distance where the cones...
  5. H

    mixed designs and repeated measures

    I want to see the effect of 3 treatment types on two dependent variables, heart beat and sweat produced. Dependent variables are measured at three different times. 3 groups of participants, drug1, drug 1&2 and a control. I also need to see if there's an interaction between the two...
  6. L

    Repeated measures help! (Friedmans Test)

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  7. M

    Repeated measures ANOVA- reshape data?

    I assessed HIV knowledge at pre, post and follow examinations. It was the same exam 14 items for pre, post and follow-up. Also The same participants completed pre,post and folow up. My data is in wide format. If i want to do a repeated measure ANOVA (this was suggested to me), do I have to...
  8. S

    SAS PROC GLIMMIX, logistic regression; how to code and interpret repeated measures?

    Hello: Thanks for reading this post! The core of my question has to do with how to correctly code repeated measures when the repeated effect (here "sampling", could easily be "time") isn't the same for all of the subjects. In context: I have sampled 15 houses 3-8 times each for presence or...
  9. P

    SPSS: How to decompose interactions in repeated measures ANCOVA?

    Hello everyone, I have a problem, too. Anyone here who could help me? I conducted a study with three categorical within-factors and one continuous personality variable: topic (1,2) x gain loss framing (1,2) x achievement security framing (1,2) x personality I know how to use the...
  10. P

    Repeated measures ANOVA w/ time-varying covariate that does not vary across subjects

    Hello community: I am seeking assistance with a repeated measures ANOVA. In this experiment, I examined the return rate of bees to colonies (= dependent variable). These colonies were subjected to one of four food treatments (= categorical predictor variable). The return rate of bees was...
  11. E

    Assumption of Homoscedasticity not met...Repeated measures ANOVA

    Hey guys, Student in clinical research here and in dire need of help. My study is a clinical trial with 2 treatment groups measured over 4 time points...with the outcomes assessed being blood levels. So my independent variables are "treatment" (2 groups) and "time" (4 time points - with...
  12. R

    Use z-scores in Repeated Measures ANCOVA?

    Hi everyone, My dissertation has participants answer three questions at four different timepoints in a video. For each timepoint, I have averaged the three questions for an average response per timepoint (4 scores). I also have a dichotomous between subjects variable, and two continuous...
  13. A

    Choosing test for longitudinal, repeated measures and clustered data

    Hi everyone! I'm a researcher within cardiovascular medicine, currently working on a study in endocrinology (diabetes). I have the following challenge, which I have discussed with several staticians who all gave me discordant advice and explanations (which is why I'll try the discussion...
  14. S

    measuring correlation over time between two variables

    Hi, For my study, I will administer the same questionnaire 3 different times: the beginning, middle, and the end of the semester. I am interested in examining the correlation among several variables, let's say student engagement and teacher support. For each questionnaire, I can do...
  15. C

    cronbachs alpha using repeated administrations on same subjects ?

    This will be an easy question for someone but I just can't find the answer via google or my text books I have a 30 item measure, an observation schedule, not standardised, and I would like to cite cronbachs alpha for it. I used it in an n=3 within subject design (psychology) where each...
  16. A

    Repeated measures ANOVA : problem with interpretation

    My repeted factor represents an effect of an antipsychotic drug on some quantitative variable measured in 5 time points. When that is the only factor in the analysis I have significant differences between time points. I have included gender, age, drug doze and years of treatment in the model...
  17. L

    Violation of Normality Assumption in Mixed Design ANOVA

    I conducted a study in which two groups of teachers (pre-service and veteran) all watched four video clips of instances of aggression between students. The clips differed by type of aggression and gender of the students depicted (physical vs. relational aggression; male vs. female). After...
  18. K

    Help! Repeated Measures ANOVA SPSS

    Context of study: 32 participants completed a self-esteem questionnaire (scores can go from 0-40). Then they are scanned in a fMRI so we can see their brain activation. On one day, they drink alcohol. On another day they drink placebo. In my SPSS sheet, I have 32 subjects. Each has a...
  19. Martin Marko

    Repeated Measures ANOVA (Split-Plot ANOVA) analysis of residuals

    Hi, how to process decent residual analysis in repeated measures? I know that the residuals should have normal distribution (altogether an in every level of repeated factor too), but is there any other way to examine the residuals? I am considering Levene's test to chcek if the variances...
  20. M

    Help! Looking for appropriate analysis for 2 points data set

    Title is pretty forward... I know I could use an ANOVA in theory, since I am looking at the change of my DV caused by an IV. The only thing that makes me unsure of what is the appropriate analysis is that I actually want to see if the change in my IV affects the change in my DV. For...