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Classification: UNCLASSIFIED Caveats: NONE I have a large group randomized trial (pre-post design) where the randomization was marginally successful. Given the pre-existing differences among groups, it makes sense to report adjusted means (aka least squares means though I...

Newsgroup members, Does anyone have a clever way to simulate a correlation matrix such that each column contains dichotomous variables (0,1) and where each column has different prevalence rates. For instance, I would like to simulate the following correlation...

Newsgroup members, I appreciate the help on this topic. David Duffy provided a solution (below) that was quite helpful, and came close to what I needed. It did a great job creating two vectors of dichotomous variables with a known...

Recently, I was working with some lagged designs where a vector of observations at one time was used to predict a vector of observations at another time using a lag 1 design. In the work, I noticed a lot of...

Interesting thread. The graphics are great, the only thing that might be worth doing for teaching purposes would be to illustrate the original distribution that is being averaged 1000 times. Below is one option based on Bill Venables code. Note...