One of the UMKC internal publications, UMatters, had a brief article about Qualtrics. What is Qualtrics, and why is UMKC offering it to researchers? Continue reading
Category Archives: Statistics
PMean: My book chapter on R
I was asked by a colleague to write a chapter for a book he was editing, Big Data Analysis for Bioinformatics and Biomedical Discoveries. My chapter was “R for Big Data Analysis.” It just about killed me to write that chapter, but I got it done about nine months ago, and now the book is out officially. Continue reading
PMean: Preprints and the Ingelfinger rule
The same blog that I highlighted below had a commentary about how clinicians almost never publish pre-prints of their work. This is in contrast to other fields, most notably Astronomy, where pre-prints are the norm. If clinicians are reluctant, the Ingelfinger rule may be to blame. Continue reading
PMean: The Likelihood Ratio Slide Rule poster submission
I submitted a poster to the 2015 UMKC Faculty Research Symposium (described at the UMKC Office of Research Support website). It’s a chance to show off some of the work I did a while back and to look for collaborators among other UMKC faculty for future research projects. Continue reading
Recommended: Safeguarding Patients in Clinical Trials with High Mortality Rates
This is an article the I would trot out if anyone tried to argue that a Data Safety and Monitoring Board should, like the investigators, be blinded as to treatment status during their deliberations. Continue reading
PMean: A book review of my first book
I wrote a book about nine years ago and interest in it has largely died down. Perhaps I should write a second edition. Anyway, I ran across a book review that I had not seen before. It was published in 2006, but I never noticed it until now. Sarah Boslaugh wrote the review and it got published in MAA Reviews (MAA stands for Mathematical Association of America). It says some nice things like my approach was “fresh.” Dr. Bosluagh also likes my web site, according to the review. Continue reading
PMean: My Google Scholar profile
A while back, I set up a publication list in Google Scholar. It tracks the number of citations received by each article that I published. One of my articles has a massive 287 citations. I’m not the first author on this or on an of the other articles that received 100+ citations. So I’m mostly riding on the coattails of some very good researchers. Continue reading
PMean: How many research subjects…
Here’s a quote from yours truly. I’ve added a cute graphic from the public domain (downloaded from www.pixabay.com) to liven it up a bit. Continue reading
PMean: How big is my graph?
When you are drawing a graph in R, sometimes you have to check how big things are before you can do anything else. There are many different ways of measuring size. Here are some simple examples. You can find the R Markdown code that created these examples here. Continue reading
PMean: Nonlinear regression for the difference of two exponentials
I wanted to provide an overview of how you analyze a classic nonlinear regression model. It is a difference of two exponential functions. This nonlinear function is used commonly in pharmocokinetic models and is a simply way to model the oral administration of a drug. I want to show how the model works in a mathematical sense and then how you fit it using R. Continue reading