repeated measures

Hello, I have conducted a 3 alternative forced choice experiment (3AFC) where participants had to combine one out of three visualizations with a specific sound. There were 4 sets of different visualizations (a set consisted of 3 visualizations) and these sets were presented together with 3...

Hello, I have data on subjects' ratings of 5 potential side effects (rated as: none, mild, moderate, considerable, strong) following three different interventions (one placebo, and two active) --which were administered in a randomized manner, each 3 weeks apart (within-subjects design)...

INTRO:Planning list wise deletion of missing data from large data set (7772). Data is from online survey, participation self-select. Q's could be skipped (none mandatory). Repeated measures resulted from 'select all apply' answer option on several q's - each option became an individual variable...

Hi Everyone, i am struggling with finding a good way to analyze a dataset. The design is this: I have 25(n) subjects, all of them are tested in an experiment under 9 conditions. I estimate an electrophysiological index (idx) in every condition for each subject. Now I want to ask whether the...

Dear all, I have data from 3 different art groups (orchestra, dance, musical theatre) collected in 3 different times of measure. Data is questionnaire based. I am interested in if X variable is predicted by Y and Z, and if this relation holds for these three different domains. So I am only...

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...

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...

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 |...

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...

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...

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...

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...

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...

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...

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...

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...

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...

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...

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...

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...