repeated measures

  1. R

    mixed model on case-matched cohort with repeated measures

    Hello, I am working on a database including multiple parameters of cancer patients. I have been asked to perform a case-matched analysis on a cohort of patients whose clinical parameters were measured at 3 time points. I am trying to account for the case-match and the 3 repeated measures in...
  2. A

    Help with which type of ANOVA to use?!

    Hello, I'm trying to figure out which type of ANOVA I'd use in this situation. My question involves 3 different groups with measurements taken at two different times (pre and post intervention). The data kind of looks like: Group 1: Pre: x, x, x, x, x, x, x, x, x, x Post: x, x, x, x, x, x, x...
  3. M

    SPSS RM ANOVA: How to display the names of levels of a within factor in the output?

    Hello everyone, I am running a split plot ANOVA in SPSS, so every column is a level of my within factor. When I do my analysis I get descriptive statistics, the F Tests and my plots including the interactions (within*between). For the between factors SPSS displays the value labels of the...
  4. K

    GLM questions for landscape experiment

    I am analyzing bird count data from surveys conducted each week (from Nov-April, when bird foraging most active near breeding cycle) for 6 years in 9 large experimental plots that are split amongst 3 regions in the landscape (6 yrs x 3 regions x 3 plots/region). We are interested in comparing...
  5. H

    Do post-hoc tests take repeated measures into account?

    Hi, I've tried finding an answer to this question but can't find one anywhere :-/ If you perform a repeated measures design experiment (for example blood pressure of 5 patients before, during and after a procedure) and get a significant repeated measures ANOVA omnibus effect, do the possible...
  6. E

    Repeated measures regression

    Hi, I have data from an experiment with a continuous dependt variable and two dicotomous independent variable. All measures are repeated within subjects. I'm trying to figure out how to make an regression model where i can account for the between subjects error-variance. Im using spss...
  7. E

    Examining whether a repeated measure is stable high, or non-stable over time

    Dear all, I have conducted an experiment with a patient versus a control group, in which I asked them to do a reaction time tasks with control words and specific symptom words. The same reaction time task was used on three different days. We want to know whether the patient group shows a bias...
  8. R

    Transformation to improve normality

    Hi, I have a problem with some data that I am trying to analyse in a Repeated Measures design. I have 5 conditions (variables), 13 subjects, data points ranging from about -40.0 to +40.0 Both the Kolmogorov-Smirnov and Shapiro-Wilk tests are significant for some of the variables. Some of...
  9. S

    Physics-style Repeated Measures of multiple predictor variables in survival analysis?

    I have inherited a longitudinal dataset where 5 different continuous independent variables were measured multiple times daily for 28 days in individual subjects. Measurement intervals were irregular, both within and between subjects. These independent variables have a relatively high variance...
  10. L

    ANOVA - one-way vs repeated measures? or both?

    What is the best way to analyze this data please? I have 2 groups (treatment group, control group) and 2 time points for each group (day 0, day 1, day 30). I want to (a) compare the treatment group to the control group at each time point, ideally to show that they are not different at day 0...
  11. C

    SAS repeated measures ANOVA, comparison of within-time effects?

    Hey guys, this is my first post, so thanks in advance for reading. I am using SAS, and comparing the effects of a drug on a biological measure, additionally I am taking repeated measurements from the same experimental setup. I have two treatment groups. I can navigate main effects...
  12. M

    degrees of freedom for two-way repeated-measures ANOVA

    I had a related topic over on the R forum involving my lmer model, but now I'm more concerned with the degrees of freedom, which I thought was a more general question that would be more appropriate here. My study had two crossed within-subjects factors. 44 subjects used an interface for 6...
  13. H

    Help in analysing pre/post stats in a repeated measures ANCOVA

    Hi all, I am currently trying to work out if it is possible to run a repeated measures ANCOVA in SPSS where the two levels of a factor are each tied to a seperate covariate. To clarify I have a study with a 2x2 design of timing (pre/post) and valance (good/bad). In the study the...
  14. L

    repeated measures - data comparisons

    Hello and thanks for reading. I'm conducting psychological research and am measuring a range of variables at four measurement points (pre-intervention, post-intervention, 1 month follow up, 3 months follow up). I am wanting to ascertain whether the intervention resulted in significant changes...
  15. J

    Lack-of-fit for repeated measures

    Greetings, I'm looking to run a lack-of-fit test on repeated measures data. To summarize my problem, I want to test whether an eight-factor regression model fails to adequately predict 15 (nominal) condition means (measured in response times). Thus, each participant has an observed mean score...
  16. A

    Mixed effects modelling help!

    Hi, I am new to mixed effects modeling and was wondering if someone could help me out. I have a data set in which 500 participants have a baseline visit and a 6 month follow up. I want to see the effect of changes in factor a, b, and c are on outcome x. However I have to exclude about 100...
  17. O

    Compare Treatment Effects of 2 Groups - Repeated Measures & Binary Outcome

    Hi, I have two groups (1:non-comorbid group, 2:comorbid group), where patients in one group have a condition that patients in the other group do not have at baseline. I want to compare risk factors among these groups on a binary outcome using longitudinal data. In other words, I want to...
  18. J

    Some help needed in analyzing Likert-type data (using Repeated Measures ANOVA?)

    First of all hello to everyone, since I'm new to this forums. I'm afraid statistics is not my strongpoint (to put it mildly), and thus apologize that I have to ask your help on what I fear is quite a 'beginner-level' type of question. Any help you can give me is greatly appreciated though...
  19. B

    Linear Mixed Models in SPSS: why the extra repeated measures option??

    Hi all, I've got a basic question about the interface of SPSS linear mixed models. The initial window provides the option to designate one or more variables as "repeated measures" and to choose a separate covariance structure for these. I noticed that not using this option doesn't do an...
  20. B

    SPSS linear mixed model for repeated measures at two levels

    Hi! I'm struggling with a basic question for which I couldn't find an answer in the texts and papers on LMM in SPSS. This is the basic structure of the dataset: - outcome = grip strength - effect of interest = injury on dominant vs non-dominant side The source of repeated measures...