A family of pdfs or pmfs ${g(t|theta):thetainTheta}$ for a univariate random variable $T$ with real-valued parameter $theta$ has a monotone likelihood ratio (MLR) if, for every $theta_2__theta_1$, $g(t|theta_2)/g(t|theta_1)$ is a monotone (nonincreasing or nondecreasing) function of $t$ on ${t:g(t|...

Introduction In some circles the Ashes is considered the ‘mother of all cricketing battles’. But, being a staunch supporter of all things Indian, cricket or otherwise, I have to say that the Ashes pales in comparison against a India-Pakistan match. After all, what are a few frowns and raised eyebrows ...

Nathaniel Smith and Stéfan van der Walt presented [YouTube] a new colormap (for Python) at SciPy 2015 called viridis. From the authors: The default colourmap in Matplotlib is the colourful rainbow-map called Jet, which is deficient in many ways: small changes in the data sometimes produce large perceptual differences and ...

Introduction The Grammar of Graphics Creating a Pie Chart (aaaargh) Introduction This is Part 2 of an article introducing R for patent analytics that focuses on visualising patent data in R using the ggplot2 package. In Part 1 we introduced the basics of wrangling patent data in R using the dplyr package ...

I find myself remaking this plot over and over. So here's a quick function. Also tests correlation significance. I quite like the spectral palette for the purpose of a heat map. It's not too painful on the eyes and variation is immediately identifiable. #' Create a Heatmap #' #' Function

Facing a simple, yet frustrating formula like this and the task to solve it for x left me googling around for hours until I found salvation in Wolfram Alpha, Wikipedia, and a nice blog post with R-syntax to solve a similar equation. Using the results from Wolfram Alpha I was ...

At the recent International Symposium on Forecasting, held in Riverside, California, Tillman Gneiting gave a great talk on “Evaluating forecasts: why proper scoring rules and consistent scoring functions matter”. It will be the subject of an IJF invited paper in due course. One of the things he talked about was ...