repeated measures

  1. W

    Regression for multiple scores obtained from multiple subjects

    Hello, I have preference ratings (1-to-7 scale) for k=80 stimuli, obtained from N=30 subjects. I would like to do a multiple regression for these scores, against a small number of weakly-correlated predictors. Some of the predictors are continuous, others are categorical. Also, some of the...
  2. I

    Help with homework

    On a homework assignment, I have a data set with the variables (in SPSS) 1) Age 2) Reactiontime (continuous) 3) drug (Placebo, or drug condition) 4) Amount of drug metabolites in their blood (continuous) 5) Subject number (1-20) 6) A median split dichotomous variable on drug levels (0...
  3. C

    Two way repeated measures with zeros, non integer values, and non-normal distribution

    I would really appreciate some help with a few models I am trying to run. Essentially my data looks at how often a subject was visited depending on treatment and subject type across two years. The data looks like this: Year | Subject | SubjectType | Treatment | BlockNum | NumberOfVisits |...
  4. R

    Dyadic repeated measures with moderation - how to analyze?

    Hi, 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 moderate these effects (for example, the length of the chat or the topic of the chat). I...
  5. H

    nlme arguments explained

    Hi All, I'm trying to run an nlme on some data looking at the nonlinear response (in this case 'distance', but will also use for 'weight') of individuals ('possum') over time (repeated measures, recorded weekly for 12 weeks = 'week'). There were 3 different 'treatment' groups. Other factors...
  6. C

    Interpreting repeated measures ANOVA results in Intervention Study

    I'm having one of those late night working problems, where I'm suddenly second guessing all my work and I seem to have lost all my statistics know-how in the last 4 hours. Here's my problemo: I did an intervention study. I have pre and post test measures, and participants were split into 2...
  7. E

    Repeated measures at many different time points

    Hello, I have logged movement data from a number of subjects (n=21) who were moving during 3 different conditions. Each subject was presented with a counterbalanced order of stimuli (conditions). Each condition was presented 6 times for every subject, giving a total of (6 times *3 conditions...
  8. D

    Help with linear regression when multiple subjects

    Hi, I have some data where each subject is presented with pairwise combinations of four test items (A, B, C and D). Each observation is a subjective difference between the two items (the exact details of the experiment are not necessary but I can expand if it helps): obs(A, B) = A - B...
  9. A

    Repeated measures ANCOVA in SPSS help needed with multiple covariates

    Hello everyone. Hope someone can help. I have a repeated measures (4) ancova I need to run with no between subjects factor. I have 5 covariates. Im trying to get the effect of 1 covariate on the repeated measures when accounting for the other 4 covariates. How best to do this? Thanks in...
  10. D

    Repeated measure analysis of means with varying sample size.

    I am looking to compare mean bite rate of the same fish populations across multiple days. Because they are the same populations they are not independent of each other. The problem is not every fish was analysed on each of the days so there is a varying sample size for each day. I believe this...
  11. H

    Non-parametric tests for repeated measures data

    Hi, I'm having difficulty finding an appropriate test for my data. The experiment is looking at the distance animals have moved from a translocation site over a 12 week period (measured weekly), where animals are divided into 3 treatments (ie. I am looking at whether the different...
  12. M

    How to analyse data when subjects received both control and experimental condition?

    Dear all, I hope to get some suggestions on how to analyse the data from an experiment I recently ran. My question is whether a new treatment has a positive effect on some or all of 4 dependent variables. 80 subjects participated in one of two versions of our experiment: pre-test > experimental...
  13. E

    How to measure- effect of additional categorical DV on repeated m. ANOVA?

    Hello, I am helping a colleague analyze data from a user study. I am a little unclear how to deal with one of her measures. I would greatly appreciate any help! Description: Independent variable: -interface modality: -audio (A), visual (V), haptic (H), control (C- no interface) Main...
  14. K

    HELP PLEASE :) ANOVAs repeated measures

    More I read more I get confused, so please help me ! 1. In 2 (2 conditions)x2 (2 time intervals) within subjects Anova if normality assumption is violated- what is the best option to go about? Ignore? 2. In 2x2 within subjects Anova if I have an interaction effect (all data ok)? Do I...
  15. L

    Data restructuring, repeated measures

    I'm sorry to be asking such a basic question, but I've been reading several tutorials and forums and still can't figure this one out. The data I have started out in an Excel file, it's similar to a patient evaluation. Each patient is evaluated by 2 nurses (out of a total of 6 nurses - that is...
  16. S

    Repeated measures GLM - restricted permutations

    Hi all, I have some multivariate data (species counts) and want to investigate the effect of some treatment over time. I am using the mvabund package in R, which fits a separate GLM to each species. Specifically, my data are invertebrate taxa collected from pitfall traps under two...
  17. C

    Issue in Interpreting SPSS output of GLM repeated measures

    I have a data set with repeated measures for each individual. That is there a re two groups, treatment and control. And each individual is measured at 3 time points. But there are missing values. That is I don't have data for all 3 time points for all of the individuals. I carried out a SPSS GLM...
  18. K

    Monte-Carlo simulation of repeated-measures ANOVA

    Hello, I want to conduct a Monte-Carlo simulation of a repeated-measures ANOVA. The random numbers used for the simulation need to have specified mean values, standard deviations and correlations between the levels of the repeated-measures variable. Generating random nubers with a...
  19. M

    Repeated measures Anova in SPSS (3x2) different factor levels

    Dear all, I'm trying to find out how to run a repeated measure anova for a 3x3x2 design with two within subjects factors in SPSS. The problem I face is that when I want to enter a factor with two levels and a second factor with three levels, SPSS asks for six within subjects variables...
  20. R

    How to set up manova in MATLAB for multifactor analysis

    I have 4 independent variables: Frequency (within-subjects, continuous, 16 levels) Amplitude (within-subjects, continuous, 3 levels) Time (between-subjects, continuous, 7 levels) Status (within-subjects, categorical, 2 levels) and 2 dependent variables: Storage (continuous) Loss...