repeated measures

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...

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...

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...

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...

hi all i read this paper http://www.psych.umn.edu/courses/spring06/federicoc/psy8815/lectures/genomegasquared.pdf and based on the following arguments: 1) very small sample size - needs unbiased estimation 2) repeated measures 3) 2 x 2 design decided on reporting the generalized...

I am analyzing a repeated-measures dataset in SAS using proc mixed, and I'm stumped about the repeated measures subject. Here's the design of the experiment: I have forest plots, each containing 100 trees, and randomly assigned to contain 1, 2, 4, or 8 different genetic clones per plot...

Hi everyone! I would like to ask you a question! I conducted an experiment in which 25 men and 25 women listened to an attractive conversation and picked a photo (between a woman with red and a woman with green shirt) and next, they heard a neutral dialogue and did exactly the same, picked a...

Greetings, The study is pretest-posttest control group design, comparing two treatments and a control group (wait list) on 7 outcome variables using a convenience sample with random assignment to the 3 groups (level of treatment is the independent variable). The outcome variables (continuous)...

Hi everyone, I have 2X2 repeated measures design (congruent/incongruent and negative/neutral). I want to predict the main effects and the interaction using questionnaires as depression, anxiety, etc. what is the best way to run this analysis? does someone have syntax for spss/other software...

Hello, I am novice so I hope that my question formuling will be understandable.. I am using the RM GLM and wonder whether some option (I doubt) or a syntax command would let SPSS calculate my between subjects factors' estimated Standard Deviations, similarly to the Means and Standard...

Hi All, I sampled crickets weekly over 5 weeks from the same population, and measured their body size. Half of the crickets were taken from predator's nests (sampled within a day of being caught), and half were sampled directly from their natural habitat. My research question is: are predators...

Hi All, I have data on 7 clusters (ie, sites). The date are monthly counts (there is no zero inflation in most of the outcomes of interest...most clusters have a count in the 10s-100s for each month) , from Jan 2004 to May 2010, however only one cluster has data before March 2006. By...

Negative Binomial Regression with Repeated Measures possible in SPSS? I'm working on my thesis in civil engineering. I am trying to create an equation to predict the number of crashes along a highway segment using Negative Binomial Regression with Repeated Measures. The way I am trying to...

Hi, I have a 3-way mixed factorial data set. In this study, an experimenter compared three different therapies for quitting smoking; let's say they are X, Y, Z in two locations (Home and Work). Therapy and location are both between subject variables. Participants were asked to rate their...

My hope is that people can chip away at the questions raised in the article. All responses are welcome! I have been spending a bit of time trying to teach myself various univariate and multivariate statistical techniques. I would really appreciate a "one stop shop" with a general overview of...

Hi, I am creating a new measurement scale for withdrawal from cannabis, and have daily withdrawal data from 50 people for 1 week before abstinence (baseline smoking as usual) and then for 2 weeks of abstinence. There are 26 items on this new scale, and essentially what I want to is to rank...

I'm working on a mixed model repeated measures ANCOVA and am working on identifying the covariance structure for my model. I am interested in modeling 2 of my variables as repeated measures, and am wondering if this is even possible. I'm working in SAS, and keep getting error messages telling me...