statistics you can probably trust

Say you fit a model using R's lm() function. What you get in return are coefficients that represent an estimate… Read more

I’ve decided it’s time to use GitHub Gist for posting code snippets in my blog. My original motivation was better… Read more

Contrasts in R determine how linear model coefficients of categorical variables are interpreted. The default contrast for unordered categorical variables… Read more

Chapter 6 of ALDA introduces strategies for fitting models in which individual change is discontinuous. This means the linear trajectory… Read more

Through 4 chapters of Applied Longitudinal Data Analysis (ALDA), the data sets have had the following constraints: Balanced – all… Read more

In my previous two posts I showed worked solutions to problems 2.5 and 11.7 in Bulmer’s Principles of Statistics, both… Read more

In my last post I solved a problem from chapter 2 of M.G. Bulmer’s Principles of Statistics. In this post… Read more

Here’s a fun problem in heredity from the Dover classic Principles of Statistics by M.G. Bulmer. It’s from chapter 2,… Read more

I’m still on my ALDA kick here, this time posting about section 4.7 of Chapter 4. In my last post… Read more

The tour of Applied Longitudinal Data Analysis (ALDA) by Singer and Willett continues today with section 4.6, Comparing Models using… Read more