# repeated measures

1. ### repeated measures MANOVA - 3 measurements in time - interpretation

Hello, I am running a repeated measures MANOVA (in SPSS) to determine whether there are statistically significant differences in a group over time (pre-intervention, post-intervention, and 1 month follow up). After entering all the variables in for all 3 measurements, the multivariate...
2. ### Looking for guidance on an experimental design

Hey folks: I've got a question that requires a somewhat complex experimental design (nested + repeated measures) and wanted to get a few opinions. I am measuring soil respiration (essentially metabolic rate of microorganisms and plants underground) in a forest that has been damaged by a...
3. ### Ancova repeated measures changing covariate

I have a three factorial 3 by 3 by 3 data set, where all three independent variables are repeatedly measured. For each of the 27 conditions I have also measured a covariate. How can I ran this three factorial design within SPSS GLM or MANOVA. So far I found only solutions for a constant...
4. ### Help on one sample repeated measures (>2 data points per subject)

Dear members of Talk Stats forum: I come to you in the hope that you can point me in the right direction to explore. I am trying to find the appropriate statistical test for a one sample, repeated measure experiment. Basically, I am measuring variable A on each participant at seven time...
5. ### Repeated Measures GLM or Logistic Regression?

I have a question that I'm hoping somebody here can help me with. I am a student working on my psychology thesis and am having some difficulty analyzing my data. I gave 300+ participants a questionnaire. They all answered a personality measure (continuous scale) and all gave their gender. I...
6. ### (SPSS repeated measures set-up) Multiple observations for each replicate possible?

Hello - I conducted an animal survey along 4 transects (1000 m each) where I also measured and identified all of the trees. I then repeatedly sampled these 4 transects daily, counting the animals when they were encountered. What I want to do: Run a generalized linear mixed model where...
7. ### Is a one-way repeated measures ANOVA appropriate?

I am investigating the ability to divide attention while driving and engaging in a secondary task. I am using a repeated measures design. Each participant must complete two tests. In test one there are traffic lights and sudden moving hazards, and in test two there are traffic lights and a lead...
8. ### repeated measures MANOVA

Does anyone know how to do a repeated measures MANOVA in SPSS v20? It has the option for repeated measures, but does not give an option for anything other than a univariate. Everything that I am reading points to MANOVA as being the better choice (and it makes sense with my data), but I'm...
9. ### repeated measure ANOVA and covariate

There are 55 subjects measured in two stages. The variable is called V1. There is another variable called V2 (dichotomies). Some values of V2 are different in Stage 1 and Stage 2. I want to compare means between V1 and V2. Normally, I can use one way repeated measures in SPSS. In addition, I...
10. ### Correlation between two dependent variables on repeated measures

Hello there! I am trying to see if there is covariation of two variables (anxiety and sleeping heart rate) over multiple days of testing the same subjects (n=13). This means that every day for 10 days each subject was tested for anxiety with a questionnaire and slept with a hearth rate...
11. ### unable to make model Hessian positive definite - help!

Hello all, My first time posting here, and really hoping that someone can help me out! I have data from a repeated measures experiment in which the time points were not evenly spaced + some missing data from individual animals, so I am using proc mixed and attempting to find the appropriate...
12. ### repeated measures + SAS + covariance structure

Hello, My first time posting here, and really hoping that someone can help me out! I have data from a repeated measures experiment in which the time points were not evenly spaced + some missing data from individual animals, so I am using proc mixed and attempting to find the appropriate...
13. ### which method should I use in this case?

I have a question. I have several (e.g. VAR01, VAR02, VAR03 ) variables. They are measured twice, one with an intervention and one without intervention. I want to test the hypothesis that the greater change in VAR01 (before and after the intervention) will also result in greater changer in...
14. ### Methods in longitudinal analyses with different follow-up times

Hi all, I am new to this forum, but registered because I am looking for the right method to use in the analyses of two different projects, both longitudinal with different follow-up times for patients. I did some research into the study methods, but wasn't sure and wanted to check on this...
15. ### Unpaired repeated measures test?

My dataset is pre- and post-test Likert Scale around an intervention, but it is not matched: it is collected anonymously from the same cohort of students (therefore I assume some small change in who's in class on each testing day). I am struggling with the analysis of this data. I can group...
16. ### Wikipedia edits across time

Hi, I'm having a hard time trying to analyse my data. I have measured the level of anxiety for each edit to a Wikipedia page, and I am considering the first 4 days since page creation. I also have large differences in the number of edits in different days: 500 edits on day 1, 300 on day 2...
17. ### Use of linear mixed models for within subjects repeated measures experiment

Hello, I am trying to argue that I used the correct statistical test for a paper that is currently in review. I have formulated a counter-argument, but I'm not an expert so I wanted to make sure I am correct. In my experiment, I measured how long it took for subjects to complete a task...
18. ### Power Calculation using Stata

Hi, I am involved in a clinical study where I need to ascertain that the study has adequate power. The study aims at understanding the effect of a program on patients. We are required to have a control and a treatment sample. I believe I can recruit about 22 individuals for the study in each...
19. ### Two-way repeated measures--post-hoc analysis?

Hello, I have run a repeated measures two-way ANOVA using SAS. The repeated measure is time and it shows that it is significant in an interaction with one of my factors. How can I do a post-hoc analysis to determine which group is actually significant? I know the usual for regular ANOVAs...
20. ### Is the following testable? I think so and have chosen Friedmans test, is it correct?

Hello TS people, Thanks for talking a look at my question/problem, I am new, you can check out my introduction topic on the appropriate forum. I am planning a set of experiments and would like to be able to present them to my Prof. with a sound set of workable statistics. Predator...