repeated measures anova

Hi there, I am doing a bit of research looking at the effects of repeat test taking. Students are allowed to take a test multiple times. I have a dataset including student scores on each iteration of the test. I have done a repeated measures ANOVA to try to determine whether scores...

Subjects were exposed to substance X on day 2 of 3 days. 6 measurements were taken on each of the 3 days at the same times each day. Some of the measurements were taken after exercise (at hours 2 and 4). Some subjects are smokers and others not. I am interested in the main effect of Day (as a...

Hello. I'm new to this site as well as to statistics. So, please forgive me if I have posted in the wrong place. I have a project where I measured a single variable over the course of 120 days. I have four treatments and five replicates. I want to know if I have a significant treatment...

Hi everyone! I am currently working on publishing an article from my Masters thesis. I had real trouble with the statistics section which was also pointed out by the markers. I was hoping to get some advice on how I could make this section clearer, concise, and overall of a better quality...

My project involves designing various controllers of a biomechanical system, and then once the controller design is complete, testing each controller on a single, standard set of 500 tasks, and determining the performance of each controller on this single set of tasks, so that I can compare the...

Hello - I am a phd student in psychology and I would be very grateful for some advice about contrasts. I have conducted a naming experiment for which response time was the outcome measure. There were 2 groups (treatment v control) and 3 testing conditions (A, B and C). I ran a mixed 2 x 3...

Hello, I have a study with 3 groups (depression, anxiety, controls) who were given 3 interview conditions (sad memory, happy memory, anxious memory). The DV is a linguistic variable (e.g., number of verbs used). To analyze main effects and interactions (group*memory condition), I have been...

Hi, I am doing a repeated measures with a covariant. a 3-way interaction (gender-group-memory) emerged as significant. I understand that when doing a repeated measure with a covariant the "post hoc" option for SPSS is not applicable. I selected "compare means" in the option window, but I...

Hi, this is my experiment: n users will use 4 different user interfaces (A-D) for exploring the content of a web site. I will systematically permute the order in which they use the different interfaces. After using an interface, a user has to fill out a questionnaire...

Is it okay to do repeated measures ANOVA if I have missing values (using STATA 11.2)? Here's my study design: 2 groups (control and treatment). Control group gets measured at 2 timepoints, treatment group has 3 timepoints (different n at each time point). For example treatment group has n=9...

I am trying to work out the most appropriate way to analyse some data from an experiment and would be really grateful for any ideas. The experiment involved getting people to perform an action using four different types of object, each obstacle type at two different sizes (same two sizes for...

Dear community, I am fairly new to the field of statistics and R and I apologise if my problem seems to be too basic. In my research I have performed a series of measurements on 5 different brands of blocks. Each block has been inspected for deformation under incremental forces (20, 30...

Hi everyone :), I have a data set that consists of 16 participants, running an experiment twice each, using different stimulus sets each time. I have 2 dependent variables: scorecorrect and scoreincorrect. I have 3 within subject independents all with 2 levels each: drugtype (alcohol or...

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...

Hi there, I have a 2x4 fully repeated measures design in which participants had to correctly state whether a target was absent or present in a visual field task, with different numbers of distractors. the first independent variable is target presence/absence the second independent variable...

N mineralisation is dependent variable. Management type (4 types) and position in valley (3 positions; nested in valley (with valley nested in management type [is this possible?])) are my independent variables. I want to test the affect of management type, position and interaction of both, on...

I am designing a study to examine the impact of manipulating instructions on memory performance. There are 5 different instructions and each subjects receives these instructions, making it a within subjects design and memory performance is the dependent variable. I would like to conduct a...

Hi, Ive done a 2 way repeated measures with one within subjects variable (Within) and one between subjects variable (Between) each with 2 levels using SPSS. The output gives me values for df Error(Within) and Error for Between and they are the same but does not give Error(Within*Between)...

I am measuring disease severity, using 5 different types of measurements, in animals treated with drug X, over multiple timepoints. The measurements can only be made when the animal is dissected. We have 30 animals, all given the same drug X on day 0, and 5 animals are taken down every 2 days...

Hello, I have 3 variables that have been measured on 4 occasions and a sample size of 16. I was considering a repeated measures MANOVA to ascertain if the changes over time were statistically significant. However, I am thinking that my sample size is too small to use a MANOVA in this way. I...