R script to calculate QIC for Generalized Estimating Equation (GEE) Model Selection

[UPDATE: IMPROVED CODE AND EXTENSIONS ARE NOW AVAILABLE ON https://github.com/djhocking/qicpack INCLUDING AS AN R PACKAGE] Generalized Estimating Equations (GEE) can be used to analyze longitudinal count data; that is, repeated counts taken from the same subject or site. This is often referred to as repeated measures data, but longitudinal data often has more repeated observations.…

Model Validation: Interpreting Residual Plots

When conducting any statistical analysis it is important to evaluate how well the model fits the data and that the data meet the assumptions of the model. There are numerous ways to do this and a variety of statistical tests to evaluate deviations from model assumptions. However, there is little general acceptance of any of…

New R IDE

I’m always looking for ways to improve my workflow and overall academic efficiency. I’ve tried a variety of text editors, GUIs, and integrated development environments (IDEs) for R. I have some preferences but I haven’t found anything that I’m completely happy with. I just heard about a new one from RStudio and am going to…

Another boring blog

I recently decided to create two blogs as outlets for my research.  The first (The Richness of Life) focuses more on the organisms I work with as an ecologist and my general interest as a student of natural history.  This blog on Quantitative Ecology stems from my recent obsessive frustration with analyzing various data sets. …